ICD-10-CM 2027
ICD-10 code for fibrosing alveolitis
From the official ICD-10-CM alphabetic index entry “Alveolitis › fibrosing (cryptogenic) (idiopathic)”. Page updated September 29, 2026.
About coding fibrosing alveolitis
The ICD-10-CM code for fibrosing alveolitis is J84.112 (Idiopathic pulmonary fibrosis).
Within J84.11 (idiopathic interstitial pneumonia), J84.112 is specifically for idiopathic pulmonary fibrosis. Related codes cover not otherwise specified (J84.111), idiopathic non-specific interstitial pneumonitis (J84.113), acute interstitial pneumonitis (J84.114), respiratory bronchiolitis interstitial lung disease (J84.115), Cryptogenic organizing pneumonia (J84.116) and Desquamative interstitial pneumonia (J84.117).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 196 (Interstitial Lung Disease with MCC, relative weight 1.8336), DRG 197 (Interstitial Lung Disease with CC, relative weight 0.9492) and DRG 198 (Interstitial Lung Disease without CC/MCC, relative weight 0.7259), in MDC 04 (Diseases and Disorders of the Respiratory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about fibrosing alveolitis ICD-10 codes
What is the ICD-10 code for fibrosing alveolitis?
- J84.112 — Idiopathic pulmonary fibrosis.
Is J84.112 billable?
- Yes. J84.112 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can J84.112 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict J84.112 as a principal diagnosis.
Is J84.112 a CC or MCC?
- No. J84.112 is neither a CC nor an MCC under MS-DRG v44.0.