ICD-10-CM 2027
ICD-10 code for lung induration
From the official ICD-10-CM alphabetic index entry “Induration, indurated › lung (black) (chronic) (fibroid)”. Page updated September 29, 2026.
About coding lung induration
The ICD-10-CM code for lung induration is J84.10 (Pulmonary fibrosis, unspecified). The official index lists 1 more specific code, 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 lung induration codes (official index)
- essential brown J84.03 — Idiopathic pulmonary hemosiderosis
Common questions about lung induration ICD-10 codes
What is the ICD-10 code for lung induration?
- J84.10 — Pulmonary fibrosis, unspecified. More specific codes apply when the documentation supports them: J84.03.
What is the ICD-10 code for essential brown lung induration?
- J84.03 — Idiopathic pulmonary hemosiderosis.
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.