ICD-10 Code J98.4 – Other disorders of lung (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J98.4 – Other disorders of lung
What it is
J98.4 identifies lung disorders that do not fit a more specific diagnosis. Use it for documented pulmonary abnormalities or conditions that are otherwise described as “other” lung disease.
Clinical signs
Clinical features vary; refer to documentation. Findings may include abnormal imaging, respiratory symptoms, or a pulmonology note describing a non-specific lung disorder.
When to use this code
Use J98.4 when the provider documents an unspecified or other named lung disorder and no more specific ICD-10-CM code applies. It may support cases where the chart describes a structural or chronic pulmonary abnormality without a clearer diagnosis. Check documentation if the record suggests a more specific lung disease.
Do not use for
Do not use this code when the condition is better described by a specific respiratory diagnosis, such as pneumonia, COPD, asthma, or lung cancer. If the documentation is incomplete, query for clarification rather than defaulting to J98.4.
Coding tip
Before assigning J98.4, confirm that the provider’s wording truly indicates an “other” lung disorder and not a more precise respiratory code.