ICD-10-CM 2027
ICD-10 code for interstitial chronic pneumonitis
From the official ICD-10-CM alphabetic index entry “Pneumonitis (acute) (primary) › interstitial (chronic)”. Page updated September 29, 2026.
About coding interstitial chronic pneumonitis
The ICD-10-CM code for interstitial chronic pneumonitis is J84.89 (Other specified interstitial pulmonary diseases). The official index lists 4 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on J84.89.
Within J84.8, choose J84.89 (Other specified interstitial pulmonary diseases) only when documentation doesn't support a more specific option: Lymphangioleiomyomatosis (J84.81), adult pulmonary Langerhans cell histiocytosis (J84.82), Surfactant mutations of the lung (J84.83) and other interstitial lung diseases of childhood (J84.84).
Don't report J84.89 together with the conditions in its Excludes1 note: cryptogenic organizing pneumonia (J84.116), idiopathic non-specific interstitial pneumonitis (J84.113), lipoid pneumonia, exogenous or unspecified (J69.1) and lymphoid interstitial pneumonia (J84.2).
Code first , if applicable: poisoning due to drug or toxin (T51-T65 with fifth or sixth character to indicate intent), for toxic pneumonopathy and underlying cause of pneumonopathy, if known.
More specific interstitial chronic pneumonitis codes (official index)
Don't confuse with (Excludes1 for J84.89)
Common questions about interstitial chronic pneumonitis ICD-10 codes
What is the ICD-10 code for interstitial chronic pneumonitis?
- J84.89 — Other specified interstitial pulmonary diseases. More specific codes apply when the documentation supports them: J84.114, J84.2, J84.89, J84.113.
What is the ICD-10 code for acute interstitial chronic pneumonitis?
- J84.114 — Acute interstitial pneumonitis.
What is the ICD-10 code for lymphoid interstitial chronic pneumonitis?
- J84.2 — Lymphoid interstitial pneumonia.
What is the ICD-10 code for non-specific interstitial chronic pneumonitis?
- J84.89 — Other specified interstitial pulmonary diseases.
Is J84.89 billable?
- Yes. J84.89 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can J84.89 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict J84.89 as a principal diagnosis.
Is J84.89 a CC or MCC?
- No. J84.89 is neither a CC nor an MCC under MS-DRG v44.0.