J84.9 Interstitial pulmonary disease, unspecified

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applicable to

• Interstitial pneumonia NOS

Applies from J84 Other interstitial pulmonary diseases

Excludes1 (never code together)

• drug-induced interstitial lung disorders (J70.2-J70.4)
• interstitial emphysema (J98.2)

Excludes2 (not included here)

• lung diseases due to external agents (J60-J70)

Code also

• , if applicable, associated condition

Risk adjustment (HCC)

• CMS-HCC V28: HCC 280 — Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders
• CMS-HCC V22: HCC 112 — Fibrosis of Lung and Other Chronic Lung Disorders
• RxHCC V08: HCC 227 — Pulmonary Fibrosis, Except Idiopathic
• ESRD V24: HCC 112

MS-DRG index

Defines the logic of DRG(s) 196-198 in MDC 04.

Approximate ICD-9-CM (GEMs)

• 516.9 Unspecified alveolar and parietoalveolar pneumonopathy (approximate)

Code annotations containing back-references to J84.9

Back-references to J84.9

• Type 2 Excludes: J12 Viral pneumonia, not elsewhere classified ("interstitial pneumonia NOS (J84.9)")
• Type 1 Excludes: J18 Pneumonia, unspecified organism ("interstitial pneumonia NOS (J84.9)")
• Type 1 Excludes: J70.2 Acute drug-induced interstitial lung disorders ("interstitial pneumonia NOS (J84.9)")
• Type 1 Excludes: J70.3 Chronic drug-induced interstitial lung disorders ("interstitial pneumonia NOS (J84.9)")
• Type 1 Excludes: J70.4 Drug-induced interstitial lung disorders, unspecified ("interstitial pneumonia NOS (J84.9)")

Back-references to J84

• Code Also: I27.23 Pulmonary hypertension due to lung diseases and hypoxia ("interstitial lung disease (J84.-)")

Diagnosis Index entries for J84.9

• Disease, diseased › lung › interstitial
• Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) › interstitial

Nearby codes

• J84.841 Neuroendocrine cell hyperplasia of infancy
• J84.842 Pulmonary interstitial glycogenosis
• J84.843 Alveolar capillary dysplasia with vein misalignment
• J84.848 Other interstitial lung diseases of childhood
• J84.89 Other specified interstitial pulmonary diseases
• J84.9 Interstitial pulmonary disease, unspecified (this code)