Hypersensitivity Pneumonitis (Chronic)

Hypersensitivity Pneumonitis (Chronic) is indexed under Respiratory, Interstitial Lung Disease. Also known as HP, extrinsic allergic alveolitis.

US prevalence

Variable by exposure; ~1-30 per 100,000 depending on occupation Source: ATS; ERS. This figure comes from a professional society, registry, or study rather than a federal source. Label: REPORTED.

ICD-10-CM codes

J67.9

Typical onset

Adults with occupational/environmental exposure

Course

progressive

Body systems

pulmonary

Sex differences

Depends on exposure type

Racial and ethnic differences

Occupational exposure patterns

What this page does not establish

These figures describe populations, not individuals, and none of them is a diagnosis or a treatment recommendation. Prevalence estimates are approximate and reflect published ranges. Disparity figures are reported patterns, not causes.

Taxonomy last reviewed 2026-05-19. Each figure on the interactive page carries its own source and retrieval date, which can be later than this review.

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