ICD-10 Code J67.7 – Air conditioner and humidifier lung (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J67.7 – Air conditioner and humidifier lung
What it is
J67.7 identifies hypersensitivity pneumonitis caused by exposure to contaminated air conditioners or humidifiers. Use it when documentation links lung inflammation to these devices or their aerosolized contaminants.
Clinical signs
Typical findings include cough, shortness of breath, and fever after exposure. Clinical features vary; refer to documentation for the exposure history and provider diagnosis.
When to use this code
Use J67.7 when the clinician documents air conditioner or humidifier lung, hypersensitivity pneumonitis, or an equivalent diagnosis tied to these exposures. It may also fit when the note clearly describes an inhalational reaction from contaminated device aerosols.
Code it only when the causal exposure is identified in the record. If the provider describes interstitial lung disease without this specific cause, check documentation before assigning J67.7.
Do not use for
Do not use this code for ordinary asthma, infection, or nonspecific cough without a documented exposure link. Check documentation if the chart does not clearly connect symptoms to an air conditioner or humidifier.
Coding tip
Look for wording such as “hypersensitivity pneumonitis from humidifier” or “air conditioner lung” before coding J67.7.