ICD-10 Code J84.112 – Idiopathic Pulmonary Fibrosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J84.112 – Idiopathic pulmonary fibrosis
What it is
J84.112 identifies idiopathic pulmonary fibrosis, a chronic interstitial lung disease with progressive scarring of the lungs. Use it when the provider documents this specific diagnosis and no known cause is identified.
Clinical signs
Common findings include worsening shortness of breath, dry cough, and reduced exercise tolerance. Imaging may show fibrotic changes; clinical features vary, so refer to documentation.
When to use this code
Use J84.112 when the medical record clearly states idiopathic pulmonary fibrosis, usual interstitial pneumonia, or IPF as the confirmed diagnosis. It is appropriate for encounters focused on evaluation, monitoring, or management of this condition.
If the note describes pulmonary fibrosis without specifying idiopathic cause, check documentation before assigning this code. You should code the documented condition, not infer etiology from incomplete wording.
Do not use for
Do not use this code for pulmonary fibrosis with a known cause, such as occupational exposure, drug reaction, or connective tissue disease. Check documentation if the fibrosis is part of another interstitial lung disorder.
Coding tip
Confirm that “idiopathic” is documented; if not, query for the underlying cause before coding J84.112.