ICD-10-CM 2027
ICD-10 code for lung fibrosis
From the official ICD-10-CM alphabetic index entry “Fibrosis, fibrotic › lung (atrophic) (chronic) (confluent) (massive) (perialveolar) (peribronchial)”. Page updated September 29, 2026.
About coding lung fibrosis
The ICD-10-CM code for lung fibrosis is J84.10 (Pulmonary fibrosis, unspecified). The official index lists 27 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 lung fibrosis codes (official index)
- with
- anthracosilicosis J60 — Coalworker's pneumoconiosis
- anthracosis J60 — Coalworker's pneumoconiosis
- asbestosis J61 — Pneumoconiosis due to asbestos and other mineral fibers
- bagassosis J67.1 — Bagassosis
- bauxite J63.1 — Bauxite fibrosis (of lung)
- berylliosis J63.2 — Berylliosis
- byssinosis J66.0 — Byssinosis
- calcicosis J62.8 — Pneumoconiosis due to other dust containing silica
- chalicosis J62.8 — Pneumoconiosis due to other dust containing silica
- dust reticulation J64 — Unspecified pneumoconiosis
- farmer's lung J67.0 — Farmer's lung
- ganister disease J62.8 — Pneumoconiosis due to other dust containing silica
- graphite J63.3 — Graphite fibrosis (of lung)
- pneumoconiosis NOS J64 — Unspecified pneumoconiosis
- siderosis J63.4 — Siderosis
- silicosis J62.8 — Pneumoconiosis due to other dust containing silica
- capillary J84.10 — Pulmonary fibrosis, unspecified
- congenital P27.8 — Other chronic respiratory diseases originating in the perinatal period
- diffuse (idiopathic) J84.10 — Pulmonary fibrosis, unspecified
- chemicals, gases, fumes or vapors (inhalation) J84.10 — Pulmonary fibrosis, unspecified
- interstitial J84.10 — Pulmonary fibrosis, unspecified
- acute J84.114 — Acute interstitial pneumonitis
- talc J62.0 — Pneumoconiosis due to talc dust
- following radiation J70.1 — Chronic and other pulmonary manifestations due to radiation
- idiopathic J84.112 — Idiopathic pulmonary fibrosis
- postinflammatory J84.10 — Pulmonary fibrosis, unspecified
- silicotic J62.8 — Pneumoconiosis due to other dust containing silica
- tuberculous
Common questions about lung fibrosis ICD-10 codes
What is the ICD-10 code for lung fibrosis?
- J84.10 — Pulmonary fibrosis, unspecified. More specific codes apply when the documentation supports them: J60, J60, J61, J67.1 and others below.
What is the ICD-10 code for capillary lung fibrosis?
- J84.10 — Pulmonary fibrosis, unspecified.
What is the ICD-10 code for congenital lung fibrosis?
- P27.8 — Other chronic respiratory diseases originating in the perinatal period.
What is the ICD-10 code for diffuse lung fibrosis?
- J84.10 — Pulmonary fibrosis, unspecified.
What is the ICD-10 code for idiopathic lung fibrosis?
- J84.112 — Idiopathic pulmonary fibrosis.
What is the ICD-10 code for postinflammatory lung fibrosis?
- J84.10 — Pulmonary fibrosis, unspecified.
What is the ICD-10 code for silicotic lung fibrosis?
- J62.8 — Pneumoconiosis due to other dust containing silica.
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.