ICD-10 Code J70.4 – Drug-induced interstitial lung disorders, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J70.4 – Drug-induced interstitial lung disorders, unspecified
What it is
J70.4 identifies an interstitial lung disorder caused by a medication or other drug exposure, when the specific lung reaction is not further described. Use it when the record links the lung condition to a drug but does not name a more specific diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings in drug-induced interstitial lung disease include cough, shortness of breath, and diffuse lung infiltrates, but you should code only what is documented.
When to use this code
Use J70.4 when the provider documents an interstitial lung disorder attributed to a drug and does not specify the exact type. It may also fit when the chart states medication-induced interstitial lung disease, pneumonitis, or pulmonary fibrosis without a more precise codeable description. Verify the causal drug relationship in the record.
Do not use for
Do not use this code for interstitial lung disease with no documented drug cause, or when a more specific drug reaction code is available. Check documentation if the condition is infectious, occupational, or otherwise unrelated to medication.
Coding tip
Always capture the offending drug and the provider’s causal wording; if the type is unclear, J70.4 is the fallback only when documentation supports drug causation.