ICD-10 Code J84.113 – Idiopathic non-specific interstitial pneumonitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J84.113 – Idiopathic non-specific interstitial pneumonitis
What it is
J84.113 identifies idiopathic non-specific interstitial pneumonitis, a lung disease that causes inflammation and scarring in the tissue around the air sacs. Use it when the diagnosis is documented as idiopathic and non-specific interstitial pneumonitis.
Clinical signs
Patients commonly have progressive shortness of breath and a dry cough. Imaging and pulmonary evaluation may show interstitial lung disease; clinical features vary, so refer to documentation.
When to use this code
Use J84.113 when the provider specifically documents idiopathic non-specific interstitial pneumonitis, including NSIP or idiopathic NSIP. It is appropriate for confirmed encounters, problem lists, and follow-up visits when the condition remains active or under evaluation.
Code it only when the record supports this exact diagnosis rather than a broader interstitial lung disease description. Check documentation if the note uses mixed terminology, such as interstitial pneumonia or pulmonary fibrosis without clarification.
Do not use for
Do not use this code for other interstitial lung diseases, pulmonary fibrosis, or non-idiopathic NSIP. If the cause or subtype is different or unclear, check documentation.
Coding tip
Look for the word idiopathic in the provider’s final diagnosis before assigning J84.113.