J84.10 ICD-10-CM Code: Pulmonary fibrosis, unspecified

Code

J84.10

Description

Pulmonary fibrosis, unspecified

HCC (V28)

HCC 280 — Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders

RAF reference coefficient

0.319

Billable

Yes

Payment year

2026

HCC Category Mapping

These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.

Work J84.10 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for J84.10

What This Code Means

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for J84.10 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

• •This is an unspecified code; attempt to determine the underlying cause and use a more specific code if possible
• •Review imaging and biopsy results to identify the type of pulmonary fibrosis

Clinical Significance

Unspecified pulmonary fibrosis represents a significant documentation gap because modern pulmonary medicine classifies pulmonary fibrosis into distinct subtypes with different treatments and prognoses. While it carries the same HCC weight as specified forms, this code should trigger a provider query to determine the specific type (idiopathic, drug-induced, radiation-related, etc.) for both clinical management and accurate risk adjustment.

Documentation Requirements

• ✓Documentation of pulmonary fibrosis on imaging (reticular pattern, honeycombing, traction bronchiectasis)
• ✓Pulmonary function tests showing restrictive pattern with reduced diffusion capacity
• ✓Investigation into the cause of fibrosis (occupational history, drug history, autoimmune workup, radiation history)
• ✓High-resolution CT findings and pattern classification (usual interstitial pneumonia, nonspecific interstitial pneumonia, etc.)
• ✓Lung biopsy results if performed
• ✓Oxygen requirements and functional assessment
• ✓Treatment plan (antifibrotic therapy, oxygen, transplant evaluation)

Commonly Confused Codes

• •J84.112 (Idiopathic pulmonary fibrosis): specific diagnosis with defined criteria; carries different treatment implications
• •J84.111 (Idiopathic interstitial pneumonia, not otherwise specified): interstitial pneumonia pattern without specific fibrosis
• •J70.1 (Chronic pulmonary manifestations due to radiation): radiation-induced fibrosis has a specific code
• •J70.3 (Chronic drug-induced interstitial lung disorders): drug-induced fibrosis has a specific code
• •J63.x-J65 (Pneumoconiosis codes): occupational dust-related fibrosis has specific codes

Child Codes