ICD-10 Code J84 – Other interstitial pulmonary diseases (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J84 – Other interstitial pulmonary diseases
What it is
J84 covers interstitial lung diseases that affect the lung tissue between the air sacs and blood vessels. Use it when documentation identifies a noninfectious interstitial pulmonary disorder not classified elsewhere.
Clinical signs
Common findings include progressive shortness of breath, dry cough, and diffuse lung changes on imaging. Clinical features vary; refer to documentation for the specific interstitial process.
When to use this code
Use J84 when the provider documents an interstitial pulmonary disease or interstitial lung disorder without a more specific ICD-10-CM option. It may fit cases described as diffuse interstitial lung disease, interstitial pneumonitis, or similar nonspecific interstitial conditions. Code the documented diagnosis, not a symptom alone.
Do not use for
Do not use J84 for infectious pneumonia, pulmonary fibrosis with a more specific code, or other lung diseases with a clearer classification. Check documentation if the record names a specific subtype.
Coding tip
Look for the exact interstitial diagnosis in the provider note and choose a more specific code when available.