ICD-10-CM 2027
ICD-10 code for pulmonary fibrosis
From the official ICD-10-CM alphabetic index entry “Fibrosis, fibrotic › pulmonary”. Page updated September 29, 2026.
About coding pulmonary fibrosis
The ICD-10-CM code for pulmonary fibrosis is J84.10 (Pulmonary fibrosis, unspecified). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on J84.10.
Within J84.1, choose J84.10 (Pulmonary fibrosis, unspecified) only when documentation doesn't support a more specific option: idiopathic interstitial pneumonia (J84.11) and in diseases classified elsewhere (J84.17).
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.
More specific pulmonary fibrosis codes (official index)
Common questions about pulmonary fibrosis ICD-10 codes
What is the ICD-10 code for pulmonary fibrosis?
- J84.10 — Pulmonary fibrosis, unspecified. More specific codes apply when the documentation supports them: P27.8, J84.112.
What is the ICD-10 code for congenital pulmonary fibrosis?
- P27.8 — Other chronic respiratory diseases originating in the perinatal period.
What is the ICD-10 code for idiopathic pulmonary fibrosis?
- J84.112 — Idiopathic pulmonary fibrosis.
Is J84.10 billable?
- Yes. J84.10 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can J84.10 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict J84.10 as a principal diagnosis.
Is J84.10 a CC or MCC?
- No. J84.10 is neither a CC nor an MCC under MS-DRG v44.0.