This reference uses VA rating codes. For a code from a medical record, check ICD-10-CM and the service date. A clinical code alone does not establish a VA rating or a matching VA diagnostic code.
Hypersensitivity pneumonitis (extrinsic allergic alveolitis)
Respiratory · 38 CFR § 4.97
Diagnostic Code 6831 is the VASRD entry for Hypersensitivity pneumonitis (extrinsic allergic alveolitis). VA applies the controlling criteria, shared formulas, and special instructions shown in 38 CFR Part 4. VMC presents this material for education and reference; it does not determine a Veteran's diagnosis, service connection, or evaluation.
Recorded index labels
These labels are already stored for this diagnostic code. They are not a new condition, rating, or medical relationship.
Appendix B
- Hypersensitivity pneumonitis.
Appendix C
- Hypersensitivity
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Source-verified VASRD criteria
How VA rates this — General Rating Formula for Interstitial Lung Disease (diagnostic codes 6825 through 6833)
These percentages summarize the regulatory criteria already mapped to this diagnostic code. They do not predict a Veteran's individual evaluation or establish service connection.
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
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
FVC of 65- to 74-percent predicted, or; DLCO (SB) of 56- to 65-percent predicted
FVC of 75- to 80-percent predicted, or; DLCO (SB) of 66- to 80-percent predicted
Special rating instructions
- General Rating Formula for Interstitial Lung Disease (diagnostic codes 6825 through 6833):
- Mycotic Lung Disease
Body system and anatomy metadata
Body system: Respiratory
Anatomy / region tags: respiratory system
These tags support discovery and body-map compatibility. They do not establish Veteran-specific laterality or entitlement.
Official VA DBQ references
DBQ catalog: va-dbq-2026.09.16 · Retrieved 2026-09-16. Official VA inventory ↗
- Ear (including Vestibular and Infectious) ↗ Related resourceCatalog category: Ear, Nose, Throat
Related by body system only. No reviewed condition-specific form match or requirement has been established.
- Loss of Sense of Smell and or Taste ↗ Related resourceCatalog category: Ear, Nose, Throat
Related by body system only. No reviewed condition-specific form match or requirement has been established.
- Sinusitis, Rhinitis and Other Conditions of the Nose, Throat, Larynx and Pharynx ↗ Related resourceCatalog category: Ear, Nose, Throat
Related by body system only. No reviewed condition-specific form match or requirement has been established.
- Respiratory Conditions (other than tuberculosis and sleep apnea) ↗ Related resourceCatalog category: Respiratory
Related by body system only. No reviewed condition-specific form match or requirement has been established.
- Sleep Apnea ↗ Related resourceCatalog category: Respiratory
Related by body system only. No reviewed condition-specific form match or requirement has been established.
VA maintains some examination forms that are not available for public use. VMC does not infer a one-code-to-one-DBQ relationship.
Evidence information
When reviewing the criteria, useful evidence categories can include diagnosis and treatment records, objective testing identified by the schedule, documented frequency/duration/severity when the criteria use those concepts, and functional effects described in medical or lay evidence. The relevant evidence depends on the actual claim and medical facts.
VMC does not diagnose conditions, guarantee a percentage, or advise anyone to exaggerate symptoms.
Legal basis and source identification
38 CFR § 4.97 · Source current through 2026-08-06 · Verified 2026-08-10
Registry content release: vasrd-registry-2026.08.1