# respiratory system Aggregated by Superinsight from public-domain sources, as of 2026-08-27. Domain: va. --- ## DC 6502 — Septum, nasal, deviation of {#6502} *38 C.F.R. § 4.97, Diagnostic Code 6502* Official source: 6502 Septum, nasal, deviation of: Traumatic only, With 50-percent obstruction of the nasal passage on both sides or complete obstruction on one side — 10 percent. --- ## DC 6504 — Nose, loss of part of, or scars {#6504} *38 C.F.R. § 4.97, Diagnostic Code 6504* Official source: 6504 Nose, loss of part of, or scars: Exposing both nasal passages — 30 percent. Loss of part of one ala, or other obvious disfigurement — 10 percent. Note: Or evaluate as DC 7800, scars, disfiguring, head, face, or neck. --- ## DC 6510 — Sinusitis, pansinusitis, chronic {#6510} *38 C.F.R. § 4.97, Diagnostic Code 6510* Official source: 6510 Sinusitis, pansinusitis, chronic. --- ## DC 6511 — Sinusitis, ethmoid, chronic {#6511} *38 C.F.R. § 4.97, Diagnostic Code 6511* Official source: 6511 Sinusitis, ethmoid, chronic. --- ## DC 6512 — Sinusitis, frontal, chronic {#6512} *38 C.F.R. § 4.97, Diagnostic Code 6512* Official source: 6512 Sinusitis, frontal, chronic. --- ## DC 6513 — Sinusitis, maxillary, chronic {#6513} *38 C.F.R. § 4.97, Diagnostic Code 6513* Official source: 6513 Sinusitis, maxillary, chronic. --- ## DC 6514 — Sinusitis, sphenoid, chronic {#6514} *38 C.F.R. § 4.97, Diagnostic Code 6514* Official source: 6514 Sinusitis, sphenoid, chronic. --- ## DC 6515 — Laryngitis, tuberculous, active or inactive {#6515} *38 C.F.R. § 4.97, Diagnostic Code 6515* Official source: 6515 Laryngitis, tuberculous, active or inactive. Rate under §§ 4.88c or 4.89, whichever is appropriate. General Rating Formula for Sinusitis (DC's 6510 through 6514): Following radical surgery with chronic osteomyelitis, or; near constant sinusitis characterized by headaches, pain and tenderness of affected sinus, and purulent discharge or crusting after repeated surgeries — 50 percent. Three or more incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; more than six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 30 percent. One or two incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; three to six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 10 percent. Detected by X-ray only — 0 percent. Note: An incapacitating episode of sinusitis means one that requires bed rest and treatment by a physician. --- ## DC 6516 — Laryngitis, chronic {#6516} *38 C.F.R. § 4.97, Diagnostic Code 6516* Official source: 6516 Laryngitis, chronic: Hoarseness, with thickening or nodules of cords, polyps, submucous infiltration, or pre-malignant changes on biopsy — 30 percent. Hoarseness, with inflammation of cords or mucous membrane — 10 percent. --- ## DC 6518 — Laryngectomy, total {#6518} *38 C.F.R. § 4.97, Diagnostic Code 6518* Official source: 6518 Laryngectomy, total. — 100 percent. Rate the residuals of partial laryngectomy as laryngitis (DC 6516), aphonia (DC 6519), or stenosis of larynx (DC 6520). --- ## DC 6519 — Aphonia, complete organic {#6519} *38 C.F.R. § 4.97, Diagnostic Code 6519* Official source: 6519 Aphonia, complete organic: Constant inability to communicate by speech — 100 percent. Constant inability to speak above a whisper — 60 percent. Note: Evaluate incomplete aphonia as laryngitis, chronic (DC 6516). --- ## DC 6520 — Larynx, stenosis of, including residuals of laryngeal trauma (unilateral or bilateral) {#6520} *38 C.F.R. § 4.97, Diagnostic Code 6520* Official source: 6520 Larynx, stenosis of, including residuals of laryngeal trauma (unilateral or bilateral): Forced expiratory volume in one second (FEV-1) less than 40 percent of predicted value, with Flow-Volume Loop compatible with upper airway obstruction, or; permanent tracheostomy — 100 percent. FEV-1 of 40- to 55-percent predicted, with Flow-Volume Loop compatible with upper airway obstruction — 60 percent. FEV-1 of 56- to 70-percent predicted, with Flow-Volume Loop compatible with upper airway obstruction — 30 percent. FEV-1 of 71- to 80-percent predicted, with Flow-Volume Loop compatible with upper airway obstruction — 10 percent. Note: Or evaluate as aphonia (DC 6519). --- ## DC 6521 — Pharynx, injuries to {#6521} *38 C.F.R. § 4.97, Diagnostic Code 6521* Official source: 6521 Pharynx, injuries to: Stricture or obstruction of pharynx or nasopharynx, or; absence of soft palate secondary to trauma, chemical burn, or granulomatous disease, or; paralysis of soft palate with swallowing difficulty (nasal regurgitation) and speech impairment — 50 percent. --- ## DC 6522 — Allergic or vasomotor rhinitis {#6522} *38 C.F.R. § 4.97, Diagnostic Code 6522* Official source: 6522 Allergic or vasomotor rhinitis: With polyps — 30 percent. Without polyps, but with greater than 50-percent obstruction of nasal passage on both sides or complete obstruction on one side — 10 percent. --- ## DC 6523 — Bacterial rhinitis {#6523} *38 C.F.R. § 4.97, Diagnostic Code 6523* Official source: 6523 Bacterial rhinitis: Rhinoscleroma — 50 percent. With permanent hypertrophy of turbinates and with greater than 50-percent obstruction of nasal passage on both sides or complete obstruction on one side — 10 percent. --- ## DC 6524 — Granulomatous rhinitis {#6524} *38 C.F.R. § 4.97, Diagnostic Code 6524* Official source: 6524 Granulomatous rhinitis: Wegener's granulomatosis, lethal midline granuloma — 100 percent. Other types of granulomatous infection — 20 percent. DISEASES OF THE TRACHEA AND BRONCHI --- ## DC 6600 — Bronchitis, chronic {#6600} *38 C.F.R. § 4.97, Diagnostic Code 6600* Official source: 6600 Bronchitis, chronic: FEV-1 less than 40 percent of predicted value, or; the ratio of Forced Expiratory Volume in one second to Forced Vital Capacity (FEV-1/FVC) less than 40 percent, or; Diffusion Capacity of the Lung for Carbon Monoxide by the Single Breath Method (DLCO (SB)) less than 40-percent predicted, or; maximum exercise capacity less than 15 ml/kg/min oxygen consumption (with cardiac or respiratory limitation), or; cor pulmonale (right heart failure), or; right ventricular hypertrophy, or; pulmonary hypertension (shown by Echo or cardiac catheterization), or; episode(s) of acute respiratory failure, or; requires outpatient oxygen therapy — 100 percent. FEV-1 of 40- to 55-percent predicted, or; FEV-1/FVC of 40 to 55 percent, or; DLCO (SB) of 40- to 55-percent predicted, or; maximum oxygen consumption of 15 to 20 ml/kg/min (with cardiorespiratory limit) — 60 percent. FEV-1 of 56- to 70-percent predicted, or; FEV-1/FVC of 56 to 70 percent, or; DLCO (SB) 56- to 65-percent predicted — 30 percent. FEV-1 of 71- to 80-percent predicted, or; FEV-1/FVC of 71 to 80 percent, or; DLCO (SB) 66- to 80-percent predicted — 10 percent. --- ## DC 6601 — Bronchiectasis {#6601} *38 C.F.R. § 4.97, Diagnostic Code 6601* Official source: 6601 Bronchiectasis: With incapacitating episodes of infection of at least six weeks total duration per year — 100 percent. With incapacitating episodes of infection of four to six weeks total duration per year, or; near constant findings of cough with purulent sputum associated with anorexia, weight loss, and frank hemoptysis and requiring antibiotic usage almost continuously — 60 percent. With incapacitating episodes of infection of two to four weeks total duration per year, or; daily productive cough with sputum that is at times purulent or blood-tinged and that requires prolonged (lasting four to six weeks) antibiotic usage more than twice a year — 30 percent. Intermittent productive cough with acute infection requiring a course of antibiotics at least twice a year — 10 percent. Or rate according to pulmonary impairment as for chronic bronchitis (DC 6600). Note: An incapacitating episode is one that requires bedrest and treatment by a physician. --- ## DC 6602 — Asthma, bronchial {#6602} *38 C.F.R. § 4.97, Diagnostic Code 6602* Official source: 6602 Asthma, bronchial: FEV-1 less than 40-percent predicted, or; FEV-1/FVC less than 40 percent, or; more than one attack per week with episodes of respiratory failure, or; requires daily use of systemic (oral or parenteral) high dose corticosteroids or immuno-suppressive medications — 100 percent. FEV-1 of 40- to 55-percent predicted, or; FEV-1/FVC of 40 to 55 percent, or; at least monthly visits to a physician for required care of exacerbations, or; intermittent (at least three per year) courses of systemic (oral or parenteral) corticosteroids — 60 percent. FEV-1 of 56- to 70-percent predicted, or; FEV-1/FVC of 56 to 70 percent, or; daily inhalational or oral bronchodilator therapy, or; inhalational anti-inflammatory medication — 30 percent. FEV-1 of 71- to 80-percent predicted, or; FEV-1/FVC of 71 to 80 percent, or; intermittent inhalational or oral bronchodilator therapy — 10 percent. Note: In the absence of clinical findings of asthma at time of examination, a verified history of asthmatic attacks must be of record. --- ## DC 6603 — Emphysema, pulmonary {#6603} *38 C.F.R. § 4.97, Diagnostic Code 6603* Official source: 6603 Emphysema, pulmonary: FEV-1 less than 40 percent of predicted value, or; the ratio of Forced Expiratory Volume in one second to Forced Vital Capacity (FEV-1/FVC) less than 40 percent, or; Diffusion Capacity of the Lung for Carbon Monoxide by the Single Breath Method (DLCO (SB)) less than 40-percent predicted, or; maximum exercise capacity less than 15 ml/kg/min oxygen consumption (with cardiac or respiratory limitation), or; cor pulmonale (right heart failure), or; right ventricular hypertrophy, or; pulmonary hypertension (shown by Echo or cardiac catheterization), or; episode(s) of acute respiratory failure, or; requires outpatient oxygen therapy. — 100 percent. FEV-1 of 40- to 55-percent predicted, or; FEV-1/FVC of 40 to 55 percent, or; DLCO (SB) of 40- to 55-percent predicted, or; maximum oxygen consumption of 15 to 20 ml/kg/min (with cardiorespiratory limit) — 60 percent. FEV-1 of 56- to 70-percent predicted, or; FEV-1/FVC of 56 to 70 percent, or; DLCO (SB) 56- to 65-percent predicted — 30 percent. FEV-1 of 71- to 80-percent predicted, or; FEV-1/FVC of 71 to 80 percent, or; DLCO (SB) 66- to 80-percent predicted — 10 percent. --- ## DC 6604 — Chronic obstructive pulmonary disease {#6604} *38 C.F.R. § 4.97, Diagnostic Code 6604* Official source: 6604 Chronic obstructive pulmonary disease: FEV-1 less than 40 percent of predicted value, or; the ratio of Forced Expiratory Volume in one second to Forced Vital Capacity (FEV-1/FVC) less than 40 percent, or; Diffusion Capacity of the Lung for Carbon Monoxide by the Single Breath Method (DLCO (SB)) less than 40-percent predicted, or; maximum exercise capacity less than 15 ml/kg/min oxygen consumption (with cardiac or respiratory limitation), or; cor pulmonale (right heart failure), or; right ventricular hypertrophy, or; pulmonary hypertension (shown by Echo or cardiac catheterization), or; episode(s) of acute respiratory failure, or; requires outpatient oxygen therapy. — 100 percent. FEV-1 of 40- to 55-percent predicted, or; FEV-1/FVC of 40 to 55 percent, or; DLCO (SB) of 40- to 55-percent predicted, or; maximum oxygen consumption of 15 to 20 ml/kg/min (with cardiorespiratory limit) — 60 percent. FEV-1 of 56- to 70-percent predicted, or; FEV-1/FVC of 56 to 70 percent, or; DLCO (SB) 56- to 65-percent predicted — 30 percent. FEV-1 of 71- to 80-percent predicted, or; FEV-1/FVC of 71 to 80 percent, or; DLCO (SB) 66- to 80-percent predicted — 10 percent. DISEASES OF THE LUNGS AND PLEURA—TUBERCULOSIS Ratings for Pulmonary Tuberculosis Entitled on August 19, 1968 --- ## DC 6701 — Tuberculosis, pulmonary, chronic, far advanced, active {#6701} *38 C.F.R. § 4.97, Diagnostic Code 6701* Official source: 6701 Tuberculosis, pulmonary, chronic, far advanced, active — 100 percent. --- ## DC 6702 — Tuberculosis, pulmonary, chronic, moderately advanced, active {#6702} *38 C.F.R. § 4.97, Diagnostic Code 6702* Official source: 6702 Tuberculosis, pulmonary, chronic, moderately advanced, active — 100 percent. --- ## DC 6703 — Tuberculosis, pulmonary, chronic, minimal, active {#6703} *38 C.F.R. § 4.97, Diagnostic Code 6703* Official source: 6703 Tuberculosis, pulmonary, chronic, minimal, active — 100 percent. --- ## DC 6704 — Tuberculosis, pulmonary, chronic, active, advancement unspecified {#6704} *38 C.F.R. § 4.97, Diagnostic Code 6704* Official source: 6704 Tuberculosis, pulmonary, chronic, active, advancement unspecified — 100 percent. --- ## DC 6721 — Tuberculosis, pulmonary, chronic, far advanced, inactive {#6721} *38 C.F.R. § 4.97, Diagnostic Code 6721* Official source: 6721 Tuberculosis, pulmonary, chronic, far advanced, inactive General Rating Formula for Sinusitis (DC's 6510 through 6514): Following radical surgery with chronic osteomyelitis, or; near constant sinusitis characterized by headaches, pain and tenderness of affected sinus, and purulent discharge or crusting after repeated surgeries — 50 percent. Three or more incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; more than six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 30 percent. One or two incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; three to six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 10 percent. Detected by X-ray only — 0 percent. Note: An incapacitating episode of sinusitis means one that requires bed rest and treatment by a physician. --- ## DC 6722 — Tuberculosis, pulmonary, chronic, moderately advanced, inactive {#6722} *38 C.F.R. § 4.97, Diagnostic Code 6722* Official source: 6722 Tuberculosis, pulmonary, chronic, moderately advanced, inactive General Rating Formula for Sinusitis (DC's 6510 through 6514): Following radical surgery with chronic osteomyelitis, or; near constant sinusitis characterized by headaches, pain and tenderness of affected sinus, and purulent discharge or crusting after repeated surgeries — 50 percent. Three or more incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; more than six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 30 percent. One or two incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; three to six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 10 percent. Detected by X-ray only — 0 percent. Note: An incapacitating episode of sinusitis means one that requires bed rest and treatment by a physician. --- ## DC 6723 — Tuberculosis, pulmonary, chronic, minimal, inactive {#6723} *38 C.F.R. § 4.97, Diagnostic Code 6723* Official source: 6723 Tuberculosis, pulmonary, chronic, minimal, inactive General Rating Formula for Sinusitis (DC's 6510 through 6514): Following radical surgery with chronic osteomyelitis, or; near constant sinusitis characterized by headaches, pain and tenderness of affected sinus, and purulent discharge or crusting after repeated surgeries — 50 percent. Three or more incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; more than six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 30 percent. One or two incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; three to six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 10 percent. Detected by X-ray only — 0 percent. Note: An incapacitating episode of sinusitis means one that requires bed rest and treatment by a physician. --- ## DC 6724 — Tuberculosis, pulmonary, chronic, inactive, advancement unspecified {#6724} *38 C.F.R. § 4.97, Diagnostic Code 6724* Official source: 6724 Tuberculosis, pulmonary, chronic, inactive, advancement unspecified General Rating Formula for Inactive Pulmonary Tuberculosis: For two years after date of inactivity, following active tuberculosis, which was clinically identified during service or subsequently — 100 percent. Thereafter for four years, or in any event, to six years after date of inactivity — 50 percent. Thereafter, for five years, or to eleven years after date of inactivity — 30 percent. Following far advanced lesions diagnosed at any time while the disease process was active, minimum — 30 percent. Following moderately advanced lesions, provided there is continued disability, emphysema, dyspnea on exertion, impairment of health, etc — 20 percent. Otherwise — 0 percent. Note (1): The 100-percent rating under codes 6701 through 6724 is not subject to a requirement of precedent hospital treatment. It will be reduced to 50 percent for failure to submit to examination or to follow prescribed treatment upon report to that effect from the medical authorities. When a veteran is placed on the 100-percent rating for inactive tuberculosis, the medical authorities will be appropriately notified of the fact, and of the necessity, as given in footnote 1 to 38 U.S.C. 1156 (and formerly in 38 U.S.C. 356, which has been repealed by Public Law 90-493), to notify the Veterans Service Center in the event of failure to submit to examination or to follow treatment. Note (2): The graduated 50-percent and 30-percent ratings and the permanent 30 percent and 20 percent ratings for inactive pulmonary tuberculosis are not to be combined with ratings for other respiratory disabilities. Following thoracoplasty the rating will be for removal of ribs combined with the rating for collapsed lung. Resection of the ribs incident to thoracoplasty will be rated as removal. Ratings for Pulmonary Tuberculosis Initially Evaluated After August 19, 1968 General Rating Formula for Sinusitis (DC's 6510 through 6514): Following radical surgery with chronic osteomyelitis, or; near constant sinusitis characterized by headaches, pain and tenderness of affected sinus, and purulent discharge or crusting after repeated surgeries — 50 percent. Three or more incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; more than six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 30 percent. One or two incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; three to six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 10 percent. Detected by X-ray only — 0 percent. Note: An incapacitating episode of sinusitis means one that requires bed rest and treatment by a physician. --- ## DC 6730 — Tuberculosis, pulmonary, chronic, active {#6730} *38 C.F.R. § 4.97, Diagnostic Code 6730* Official source: 6730 Tuberculosis, pulmonary, chronic, active — 100 percent. Note: Active pulmonary tuberculosis will be considered permanently and totally disabling for non-service-connected pension purposes in the following circumstances: (a) Associated with active tuberculosis involving other than the respiratory system. (b) With severe associated symptoms or with extensive cavity formation. (c) Reactivated cases, generally. (d) With advancement of lesions on successive examinations or while under treatment. (e) Without retrogression of lesions or other evidence of material improvement at the end of six months hospitalization or without change of diagnosis from “active” at the end of 12 months hospitalization. Material improvement means lessening or absence of clinical symptoms, and X-ray findings of a stationary or retrogressive lesion. --- ## DC 6731 — Tuberculosis, pulmonary, chronic, inactive {#6731} *38 C.F.R. § 4.97, Diagnostic Code 6731* Official source: 6731 Tuberculosis, pulmonary, chronic, inactive: Depending on the specific findings, rate residuals as interstitial lung disease, restrictive lung disease, or, when obstructive lung disease is the major residual, as chronic bronchitis (DC 6600). Rate thoracoplasty as removal of ribs under DC 5297. Note: A mandatory examination will be requested immediately following notification that active tuberculosis evaluated under DC 6730 has become inactive. Any change in evaluation will be carried out under the provisions of § 3.105(e). General Rating Formula for Sinusitis (DC's 6510 through 6514): Following radical surgery with chronic osteomyelitis, or; near constant sinusitis characterized by headaches, pain and tenderness of affected sinus, and purulent discharge or crusting after repeated surgeries — 50 percent. Three or more incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; more than six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 30 percent. One or two incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; three to six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 10 percent. Detected by X-ray only — 0 percent. Note: An incapacitating episode of sinusitis means one that requires bed rest and treatment by a physician. --- ## DC 6732 — Pleurisy, tuberculous, active or inactive {#6732} *38 C.F.R. § 4.97, Diagnostic Code 6732* Official source: 6732 Pleurisy, tuberculous, active or inactive: Rate under §§ 4.88c or 4.89, whichever is appropriate. NONTUBERCULOUS DISEASES General Rating Formula for Sinusitis (DC's 6510 through 6514): Following radical surgery with chronic osteomyelitis, or; near constant sinusitis characterized by headaches, pain and tenderness of affected sinus, and purulent discharge or crusting after repeated surgeries — 50 percent. Three or more incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; more than six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 30 percent. One or two incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; three to six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 10 percent. Detected by X-ray only — 0 percent. Note: An incapacitating episode of sinusitis means one that requires bed rest and treatment by a physician. --- ## DC 6817 — Pulmonary Vascular Disease {#6817} *38 C.F.R. § 4.97, Diagnostic Code 6817* Official source: 6817 Pulmonary Vascular Disease: Primary pulmonary hypertension, or; chronic pulmonary thromboembolism with evidence of pulmonary hypertension, right ventricular hypertrophy, or cor pulmonale, or; pulmonary hypertension secondary to other obstructive disease of pulmonary arteries or veins with evidence of right ventricular hypertrophy or cor pulmonale — 100 percent. Chronic pulmonary thromboembolism requiring anticoagulant therapy, or; following inferior vena cava surgery without evidence of pulmonary hypertension or right ventricular dysfunction — 60 percent. Symptomatic, following resolution of acute pulmonary embolism — 30 percent. Asymptomatic, following resolution of pulmonary thromboembolism — 0 percent. Note: Evaluate other residuals following pulmonary embolism under the most appropriate diagnostic code, such as chronic bronchitis (DC 6600) or chronic pleural effusion or fibrosis (DC 6844), but do not combine that evaluation with any of the above evaluations. --- ## DC 6819 — Neoplasms, malignant, any specified part of respiratory system exclusive of skin growths {#6819} *38 C.F.R. § 4.97, Diagnostic Code 6819* Official source: 6819 Neoplasms, malignant, any specified part of respiratory system exclusive of skin growths — 100 percent. Note: A rating of 100 percent shall continue beyond the cessation of any surgical, X-ray, antineoplastic chemotherapy or other therapeutic procedure. Six months after discontinuance of such treatment, the appropriate disability rating shall be determined by mandatory VA examination. Any change in evaluation based upon that or any subsequent examination shall be subject to the provisions of § 3.105(e) of this chapter. If there has been no local recurrence or metastasis, rate on residuals. --- ## DC 6820 — Neoplasms, benign, any specified part of respiratory system. Evaluate using an appropriate respiratory analogy {#6820} *38 C.F.R. § 4.97, Diagnostic Code 6820* Official source: 6820 Neoplasms, benign, any specified part of respiratory system. Evaluate using an appropriate respiratory analogy. Bacterial Infections of the Lung General Rating Formula for Sinusitis (DC's 6510 through 6514): Following radical surgery with chronic osteomyelitis, or; near constant sinusitis characterized by headaches, pain and tenderness of affected sinus, and purulent discharge or crusting after repeated surgeries — 50 percent. Three or more incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; more than six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 30 percent. One or two incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; three to six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 10 percent. Detected by X-ray only — 0 percent. Note: An incapacitating episode of sinusitis means one that requires bed rest and treatment by a physician. --- ## DC 6822 — Actinomycosis {#6822} *38 C.F.R. § 4.97, Diagnostic Code 6822* Official source: 6822 Actinomycosis. General Rating Formula for Sinusitis (DC's 6510 through 6514): Following radical surgery with chronic osteomyelitis, or; near constant sinusitis characterized by headaches, pain and tenderness of affected sinus, and purulent discharge or crusting after repeated surgeries — 50 percent. Three or more incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; more than six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 30 percent. One or two incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; three to six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 10 percent. Detected by X-ray only — 0 percent. Note: An incapacitating episode of sinusitis means one that requires bed rest and treatment by a physician. --- ## DC 6823 — Nocardiosis {#6823} *38 C.F.R. § 4.97, Diagnostic Code 6823* Official source: 6823 Nocardiosis. General Rating Formula for Sinusitis (DC's 6510 through 6514): Following radical surgery with chronic osteomyelitis, or; near constant sinusitis characterized by headaches, pain and tenderness of affected sinus, and purulent discharge or crusting after repeated surgeries — 50 percent. Three or more incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; more than six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 30 percent. One or two incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; three to six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 10 percent. Detected by X-ray only — 0 percent. Note: An incapacitating episode of sinusitis means one that requires bed rest and treatment by a physician. --- ## DC 6824 — Chronic lung abscess {#6824} *38 C.F.R. § 4.97, Diagnostic Code 6824* Official source: 6824 Chronic lung abscess. General Rating Formula for Sinusitis (DC's 6510 through 6514): Following radical surgery with chronic osteomyelitis, or; near constant sinusitis characterized by headaches, pain and tenderness of affected sinus, and purulent discharge or crusting after repeated surgeries — 50 percent. Three or more incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; more than six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 30 percent. One or two incapacitating episodes per year of sinusitis requiring prolonged (lasting four to six weeks) antibiotic treatment, or; three to six non-incapacitating episodes per year of sinusitis characterized by headaches, pain, and purulent discharge or crusting — 10 percent. Detected by X-ray only — 0 percent. Note: An incapacitating episode of sinusitis means one that requires bed rest and treatment by a physician. --- ## DC 6825 — Diffuse interstitial fibrosis (interstitial pneumonitis, fibrosing alveolitis) {#6825} *38 C.F.R. § 4.97, Diagnostic Code 6825* Official source: 6825 Diffuse interstitial fibrosis (interstitial pneumonitis, fibrosing alveolitis). General Rating Formula for Bacterial Infections of the Lung (diagnostic codes 6822 through 6824): Active infection with systemic symptoms such as fever, night sweats, weight loss, or hemoptysis — 100 percent. Depending on the specific findings, rate residuals as interstitial lung disease, restrictive lung disease, or, when obstructive lung disease is the major residual, as chronic bronchitis (DC 6600). Interstitial Lung Disease --- ## DC 6826 — Desquamative interstitial pneumonitis {#6826} *38 C.F.R. § 4.97, Diagnostic Code 6826* Official source: 6826 Desquamative interstitial pneumonitis. General Rating Formula for Bacterial Infections of the Lung (diagnostic codes 6822 through 6824): Active infection with systemic symptoms such as fever, night sweats, weight loss, or hemoptysis — 100 percent. Depending on the specific findings, rate residuals as interstitial lung disease, restrictive lung disease, or, when obstructive lung disease is the major residual, as chronic bronchitis (DC 6600). Interstitial Lung Disease --- ## DC 6827 — Pulmonary alveolar proteinosis {#6827} *38 C.F.R. § 4.97, Diagnostic Code 6827* Official source: 6827 Pulmonary alveolar proteinosis. General Rating Formula for Bacterial Infections of the Lung (diagnostic codes 6822 through 6824): Active infection with systemic symptoms such as fever, night sweats, weight loss, or hemoptysis — 100 percent. Depending on the specific findings, rate residuals as interstitial lung disease, restrictive lung disease, or, when obstructive lung disease is the major residual, as chronic bronchitis (DC 6600). Interstitial Lung Disease --- ## DC 6828 — Eosinophilic granuloma of lung {#6828} *38 C.F.R. § 4.97, Diagnostic Code 6828* Official source: 6828 Eosinophilic granuloma of lung. General Rating Formula for Bacterial Infections of the Lung (diagnostic codes 6822 through 6824): Active infection with systemic symptoms such as fever, night sweats, weight loss, or hemoptysis — 100 percent. Depending on the specific findings, rate residuals as interstitial lung disease, restrictive lung disease, or, when obstructive lung disease is the major residual, as chronic bronchitis (DC 6600). Interstitial Lung Disease --- ## DC 6829 — Drug-induced pulmonary pneumonitis and fibrosis {#6829} *38 C.F.R. § 4.97, Diagnostic Code 6829* Official source: 6829 Drug-induced pulmonary pneumonitis and fibrosis. General Rating Formula for Bacterial Infections of the Lung (diagnostic codes 6822 through 6824): Active infection with systemic symptoms such as fever, night sweats, weight loss, or hemoptysis — 100 percent. Depending on the specific findings, rate residuals as interstitial lung disease, restrictive lung disease, or, when obstructive lung disease is the major residual, as chronic bronchitis (DC 6600). Interstitial Lung Disease --- ## DC 6830 — Radiation-induced pulmonary pneumonitis and fibrosis {#6830} *38 C.F.R. § 4.97, Diagnostic Code 6830* Official source: 6830 Radiation-induced pulmonary pneumonitis and fibrosis. General Rating Formula for Bacterial Infections of the Lung (diagnostic codes 6822 through 6824): Active infection with systemic symptoms such as fever, night sweats, weight loss, or hemoptysis — 100 percent. Depending on the specific findings, rate residuals as interstitial lung disease, restrictive lung disease, or, when obstructive lung disease is the major residual, as chronic bronchitis (DC 6600). Interstitial Lung Disease --- ## DC 6831 — Hypersensitivity pneumonitis (extrinsic allergic alveolitis) {#6831} *38 C.F.R. § 4.97, Diagnostic Code 6831* Official source: 6831 Hypersensitivity pneumonitis (extrinsic allergic alveolitis). General Rating Formula for Bacterial Infections of the Lung (diagnostic codes 6822 through 6824): Active infection with systemic symptoms such as fever, night sweats, weight loss, or hemoptysis — 100 percent. Depending on the specific findings, rate residuals as interstitial lung disease, restrictive lung disease, or, when obstructive lung disease is the major residual, as chronic bronchitis (DC 6600). Interstitial Lung Disease --- ## DC 6832 — Pneumoconiosis (silicosis, anthracosis, etc.) {#6832} *38 C.F.R. § 4.97, Diagnostic Code 6832* Official source: 6832 Pneumoconiosis (silicosis, anthracosis, etc.). General Rating Formula for Bacterial Infections of the Lung (diagnostic codes 6822 through 6824): Active infection with systemic symptoms such as fever, night sweats, weight loss, or hemoptysis — 100 percent. Depending on the specific findings, rate residuals as interstitial lung disease, restrictive lung disease, or, when obstructive lung disease is the major residual, as chronic bronchitis (DC 6600). Interstitial Lung Disease --- ## DC 6833 — Asbestosis {#6833} *38 C.F.R. § 4.97, Diagnostic Code 6833* Official source: 6833 Asbestosis. General Rating Formula for Bacterial Infections of the Lung (diagnostic codes 6822 through 6824): Active infection with systemic symptoms such as fever, night sweats, weight loss, or hemoptysis — 100 percent. Depending on the specific findings, rate residuals as interstitial lung disease, restrictive lung disease, or, when obstructive lung disease is the major residual, as chronic bronchitis (DC 6600). Interstitial Lung Disease --- ## DC 6834 — Histoplasmosis of lung {#6834} *38 C.F.R. § 4.97, Diagnostic Code 6834* Official source: 6834 Histoplasmosis of lung. General Rating Formula for Interstitial Lung Disease (diagnostic codes 6825 through 6833): Forced Vital Capacity (FVC) less than 50-percent predicted, or; Diffusion Capacity of the Lung for Carbon Monoxide by the Single Breath Method (DLCO (SB)) less than 40-percent predicted, or; maximum exercise capacity less than 15 ml/kg/min oxygen consumption with cardiorespiratory limitation, or; cor pulmonale or pulmonary hypertension, or; requires outpatient oxygen therapy — 100 percent. FVC of 50- to 64-percent predicted, or; DLCO (SB) of 40- to 55-percent predicted, or; maximum exercise capacity of 15 to 20 ml/kg/min oxygen consumption with cardiorespiratory limitation — 60 percent. FVC of 65- to 74-percent predicted, or; DLCO (SB) of 56- to 65-percent predicted — 30 percent. FVC of 75- to 80-percent predicted, or; DLCO (SB) of 66- to 80-percent predicted — 10 percent. Mycotic Lung Disease --- ## DC 6835 — Coccidioidomycosis {#6835} *38 C.F.R. § 4.97, Diagnostic Code 6835* Official source: 6835 Coccidioidomycosis. General Rating Formula for Interstitial Lung Disease (diagnostic codes 6825 through 6833): Forced Vital Capacity (FVC) less than 50-percent predicted, or; Diffusion Capacity of the Lung for Carbon Monoxide by the Single Breath Method (DLCO (SB)) less than 40-percent predicted, or; maximum exercise capacity less than 15 ml/kg/min oxygen consumption with cardiorespiratory limitation, or; cor pulmonale or pulmonary hypertension, or; requires outpatient oxygen therapy — 100 percent. FVC of 50- to 64-percent predicted, or; DLCO (SB) of 40- to 55-percent predicted, or; maximum exercise capacity of 15 to 20 ml/kg/min oxygen consumption with cardiorespiratory limitation — 60 percent. FVC of 65- to 74-percent predicted, or; DLCO (SB) of 56- to 65-percent predicted — 30 percent. FVC of 75- to 80-percent predicted, or; DLCO (SB) of 66- to 80-percent predicted — 10 percent. Mycotic Lung Disease --- ## DC 6836 — Blastomycosis {#6836} *38 C.F.R. § 4.97, Diagnostic Code 6836* Official source: 6836 Blastomycosis. General Rating Formula for Interstitial Lung Disease (diagnostic codes 6825 through 6833): Forced Vital Capacity (FVC) less than 50-percent predicted, or; Diffusion Capacity of the Lung for Carbon Monoxide by the Single Breath Method (DLCO (SB)) less than 40-percent predicted, or; maximum exercise capacity less than 15 ml/kg/min oxygen consumption with cardiorespiratory limitation, or; cor pulmonale or pulmonary hypertension, or; requires outpatient oxygen therapy — 100 percent. FVC of 50- to 64-percent predicted, or; DLCO (SB) of 40- to 55-percent predicted, or; maximum exercise capacity of 15 to 20 ml/kg/min oxygen consumption with cardiorespiratory limitation — 60 percent. FVC of 65- to 74-percent predicted, or; DLCO (SB) of 56- to 65-percent predicted — 30 percent. FVC of 75- to 80-percent predicted, or; DLCO (SB) of 66- to 80-percent predicted — 10 percent. Mycotic Lung Disease --- ## DC 6837 — Cryptococcosis {#6837} *38 C.F.R. § 4.97, Diagnostic Code 6837* Official source: 6837 Cryptococcosis. General Rating Formula for Interstitial Lung Disease (diagnostic codes 6825 through 6833): Forced Vital Capacity (FVC) less than 50-percent predicted, or; Diffusion Capacity of the Lung for Carbon Monoxide by the Single Breath Method (DLCO (SB)) less than 40-percent predicted, or; maximum exercise capacity less than 15 ml/kg/min oxygen consumption with cardiorespiratory limitation, or; cor pulmonale or pulmonary hypertension, or; requires outpatient oxygen therapy — 100 percent. FVC of 50- to 64-percent predicted, or; DLCO (SB) of 40- to 55-percent predicted, or; maximum exercise capacity of 15 to 20 ml/kg/min oxygen consumption with cardiorespiratory limitation — 60 percent. FVC of 65- to 74-percent predicted, or; DLCO (SB) of 56- to 65-percent predicted — 30 percent. FVC of 75- to 80-percent predicted, or; DLCO (SB) of 66- to 80-percent predicted — 10 percent. Mycotic Lung Disease --- ## DC 6838 — Aspergillosis {#6838} *38 C.F.R. § 4.97, Diagnostic Code 6838* Official source: 6838 Aspergillosis. General Rating Formula for Interstitial Lung Disease (diagnostic codes 6825 through 6833): Forced Vital Capacity (FVC) less than 50-percent predicted, or; Diffusion Capacity of the Lung for Carbon Monoxide by the Single Breath Method (DLCO (SB)) less than 40-percent predicted, or; maximum exercise capacity less than 15 ml/kg/min oxygen consumption with cardiorespiratory limitation, or; cor pulmonale or pulmonary hypertension, or; requires outpatient oxygen therapy — 100 percent. FVC of 50- to 64-percent predicted, or; DLCO (SB) of 40- to 55-percent predicted, or; maximum exercise capacity of 15 to 20 ml/kg/min oxygen consumption with cardiorespiratory limitation — 60 percent. FVC of 65- to 74-percent predicted, or; DLCO (SB) of 56- to 65-percent predicted — 30 percent. FVC of 75- to 80-percent predicted, or; DLCO (SB) of 66- to 80-percent predicted — 10 percent. Mycotic Lung Disease --- ## DC 6839 — Mucormycosis {#6839} *38 C.F.R. § 4.97, Diagnostic Code 6839* Official source: 6839 Mucormycosis. General Rating Formula for Interstitial Lung Disease (diagnostic codes 6825 through 6833): Forced Vital Capacity (FVC) less than 50-percent predicted, or; Diffusion Capacity of the Lung for Carbon Monoxide by the Single Breath Method (DLCO (SB)) less than 40-percent predicted, or; maximum exercise capacity less than 15 ml/kg/min oxygen consumption with cardiorespiratory limitation, or; cor pulmonale or pulmonary hypertension, or; requires outpatient oxygen therapy — 100 percent. FVC of 50- to 64-percent predicted, or; DLCO (SB) of 40- to 55-percent predicted, or; maximum exercise capacity of 15 to 20 ml/kg/min oxygen consumption with cardiorespiratory limitation — 60 percent. FVC of 65- to 74-percent predicted, or; DLCO (SB) of 56- to 65-percent predicted — 30 percent. FVC of 75- to 80-percent predicted, or; DLCO (SB) of 66- to 80-percent predicted — 10 percent. Mycotic Lung Disease --- ## DC 6840 — Diaphragm paralysis or paresis {#6840} *38 C.F.R. § 4.97, Diagnostic Code 6840* Official source: 6840 Diaphragm paralysis or paresis. General Rating Formula for Mycotic Lung Disease (diagnostic codes 6834 through 6839): Chronic pulmonary mycosis with persistent fever, weight loss, night sweats, or massive hemoptysis — 100 percent. Chronic pulmonary mycosis requiring suppressive therapy with no more than minimal symptoms such as occasional minor hemoptysis or productive cough — 50 percent. Chronic pulmonary mycosis with minimal symptoms such as occasional minor hemoptysis or productive cough — 30 percent. Healed and inactive mycotic lesions, asymptomatic — 0 percent. Note: Coccidioidomycosis has an incubation period up to 21 days, and the disseminated phase is ordinarily manifest within six months of the primary phase. However, there are instances of dissemination delayed up to many years after the initial infection which may have been unrecognized. Accordingly, when service connection is under consideration in the absence of record or other evidence of the disease in service, service in southwestern United States where the disease is endemic and absence of prolonged residence in this locality before or after service will be the deciding factor. Restrictive Lung Disease --- ## DC 6841 — Spinal cord injury with respiratory insufficiency {#6841} *38 C.F.R. § 4.97, Diagnostic Code 6841* Official source: 6841 Spinal cord injury with respiratory insufficiency. General Rating Formula for Mycotic Lung Disease (diagnostic codes 6834 through 6839): Chronic pulmonary mycosis with persistent fever, weight loss, night sweats, or massive hemoptysis — 100 percent. Chronic pulmonary mycosis requiring suppressive therapy with no more than minimal symptoms such as occasional minor hemoptysis or productive cough — 50 percent. Chronic pulmonary mycosis with minimal symptoms such as occasional minor hemoptysis or productive cough — 30 percent. Healed and inactive mycotic lesions, asymptomatic — 0 percent. Note: Coccidioidomycosis has an incubation period up to 21 days, and the disseminated phase is ordinarily manifest within six months of the primary phase. However, there are instances of dissemination delayed up to many years after the initial infection which may have been unrecognized. Accordingly, when service connection is under consideration in the absence of record or other evidence of the disease in service, service in southwestern United States where the disease is endemic and absence of prolonged residence in this locality before or after service will be the deciding factor. Restrictive Lung Disease --- ## DC 6842 — Kyphoscoliosis, pectus excavatum, pectus carinatum {#6842} *38 C.F.R. § 4.97, Diagnostic Code 6842* Official source: 6842 Kyphoscoliosis, pectus excavatum, pectus carinatum. General Rating Formula for Mycotic Lung Disease (diagnostic codes 6834 through 6839): Chronic pulmonary mycosis with persistent fever, weight loss, night sweats, or massive hemoptysis — 100 percent. Chronic pulmonary mycosis requiring suppressive therapy with no more than minimal symptoms such as occasional minor hemoptysis or productive cough — 50 percent. Chronic pulmonary mycosis with minimal symptoms such as occasional minor hemoptysis or productive cough — 30 percent. Healed and inactive mycotic lesions, asymptomatic — 0 percent. Note: Coccidioidomycosis has an incubation period up to 21 days, and the disseminated phase is ordinarily manifest within six months of the primary phase. However, there are instances of dissemination delayed up to many years after the initial infection which may have been unrecognized. Accordingly, when service connection is under consideration in the absence of record or other evidence of the disease in service, service in southwestern United States where the disease is endemic and absence of prolonged residence in this locality before or after service will be the deciding factor. Restrictive Lung Disease --- ## DC 6843 — Traumatic chest wall defect, pneumothorax, hernia, etc {#6843} *38 C.F.R. § 4.97, Diagnostic Code 6843* Official source: 6843 Traumatic chest wall defect, pneumothorax, hernia, etc. General Rating Formula for Mycotic Lung Disease (diagnostic codes 6834 through 6839): Chronic pulmonary mycosis with persistent fever, weight loss, night sweats, or massive hemoptysis — 100 percent. Chronic pulmonary mycosis requiring suppressive therapy with no more than minimal symptoms such as occasional minor hemoptysis or productive cough — 50 percent. Chronic pulmonary mycosis with minimal symptoms such as occasional minor hemoptysis or productive cough — 30 percent. Healed and inactive mycotic lesions, asymptomatic — 0 percent. Note: Coccidioidomycosis has an incubation period up to 21 days, and the disseminated phase is ordinarily manifest within six months of the primary phase. However, there are instances of dissemination delayed up to many years after the initial infection which may have been unrecognized. Accordingly, when service connection is under consideration in the absence of record or other evidence of the disease in service, service in southwestern United States where the disease is endemic and absence of prolonged residence in this locality before or after service will be the deciding factor. Restrictive Lung Disease --- ## DC 6844 — Post-surgical residual (lobectomy, pneumonectomy, etc.) {#6844} *38 C.F.R. § 4.97, Diagnostic Code 6844* Official source: 6844 Post-surgical residual (lobectomy, pneumonectomy, etc.). General Rating Formula for Mycotic Lung Disease (diagnostic codes 6834 through 6839): Chronic pulmonary mycosis with persistent fever, weight loss, night sweats, or massive hemoptysis — 100 percent. Chronic pulmonary mycosis requiring suppressive therapy with no more than minimal symptoms such as occasional minor hemoptysis or productive cough — 50 percent. Chronic pulmonary mycosis with minimal symptoms such as occasional minor hemoptysis or productive cough — 30 percent. Healed and inactive mycotic lesions, asymptomatic — 0 percent. Note: Coccidioidomycosis has an incubation period up to 21 days, and the disseminated phase is ordinarily manifest within six months of the primary phase. However, there are instances of dissemination delayed up to many years after the initial infection which may have been unrecognized. Accordingly, when service connection is under consideration in the absence of record or other evidence of the disease in service, service in southwestern United States where the disease is endemic and absence of prolonged residence in this locality before or after service will be the deciding factor. Restrictive Lung Disease --- ## DC 6845 — Chronic pleural effusion or fibrosis {#6845} *38 C.F.R. § 4.97, Diagnostic Code 6845* Official source: 6845 Chronic pleural effusion or fibrosis. General Rating Formula for Mycotic Lung Disease (diagnostic codes 6834 through 6839): Chronic pulmonary mycosis with persistent fever, weight loss, night sweats, or massive hemoptysis — 100 percent. Chronic pulmonary mycosis requiring suppressive therapy with no more than minimal symptoms such as occasional minor hemoptysis or productive cough — 50 percent. Chronic pulmonary mycosis with minimal symptoms such as occasional minor hemoptysis or productive cough — 30 percent. Healed and inactive mycotic lesions, asymptomatic — 0 percent. Note: Coccidioidomycosis has an incubation period up to 21 days, and the disseminated phase is ordinarily manifest within six months of the primary phase. However, there are instances of dissemination delayed up to many years after the initial infection which may have been unrecognized. Accordingly, when service connection is under consideration in the absence of record or other evidence of the disease in service, service in southwestern United States where the disease is endemic and absence of prolonged residence in this locality before or after service will be the deciding factor. Restrictive Lung Disease --- ## DC 6846 — Sarcoidosis {#6846} *38 C.F.R. § 4.97, Diagnostic Code 6846* Official source: 6846 Sarcoidosis: Cor pulmonale, or; cardiac involvement with congestive heart failure, or; progressive pulmonary disease with fever, night sweats, and weight loss despite treatment — 100 percent. Pulmonary involvement requiring systemic high dose (therapeutic) corticosteroids for control — 60 percent. Pulmonary involvement with persistent symptoms requiring chronic low dose (maintenance) or intermittent corticosteroids — 30 percent. Chronic hilar adenopathy or stable lung infiltrates without symptoms or physiologic impairment — 0 percent. Or rate active disease or residuals as chronic bronchitis (DC 6600) and extra-pulmonary involvement under specific body system involved --- ## DC 6847 — Sleep Apnea Syndromes (Obstructive, Central, Mixed) {#6847} *38 C.F.R. § 4.97, Diagnostic Code 6847* Official source: 6847 Sleep Apnea Syndromes (Obstructive, Central, Mixed): Chronic respiratory failure with carbon dioxide retention or cor pulmonale, or; requires tracheostomy — 100 percent. Requires use of breathing assistance device such as continuous airway pressure (CPAP) machine — 50 percent. Persistent day-time hypersomnolence — 30 percent. Asymptomatic but with documented sleep disorder breathing — 0 percent. Review for entitlement to special monthly compensation under § 3.350 of this chapter.