A42.0 Pulmonary actinomycosis

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

Applies from A42 Actinomycosis

Excludes1 (never code together)

• actinomycetoma (B47.1)

Risk adjustment (HCC)

• CMS-HCC V22: HCC 115 — Pneumococcal Pneumonia, Empyema, Lung Abscess
• ESRD V24: HCC 115

MS-DRG index

Defines the logic of DRG(s) 177-179 in MDC 04.

Approximate ICD-9-CM (GEMs)

• 039.1 Pulmonary actinomycotic infection (approximate)

Code annotations containing back-references to A42.0

Back-references to A42.0

• Type 1 Excludes: J17 Pneumonia in diseases classified elsewhere ("pneumonia in actinomycosis (A42.0)")

Diagnosis Index entries for A42.0

• Actinomycosis, actinomycotic › with pneumonia
• Actinomycosis, actinomycotic › pulmonary
• Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) › in (due to) › actinomycosis

Nearby codes

• A42 Actinomycosis
• A42.0 Pulmonary actinomycosis (this code)
• A42.1 Abdominal actinomycosis
• A42.2 Cervicofacial actinomycosis
• A42.7 Actinomycotic sepsis
• A42.8 Other forms of actinomycosis
• A42.81 Actinomycotic meningitis