A42.1 Abdominal 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)

MS-DRG index

Defines the logic of DRG(s) 371-373 in MDC 06.

Approximate ICD-9-CM (GEMs)

• 039.2 Abdominal actinomycotic infection

Diagnosis Index entries for A42.1

• Actinomycosis, actinomycotic › abdominal
• Actinomycosis, actinomycotic › gastrointestinal

Nearby codes

• A42 Actinomycosis
• A42.0 Pulmonary actinomycosis
• A42.1 Abdominal actinomycosis (this code)
• A42.2 Cervicofacial actinomycosis
• A42.7 Actinomycotic sepsis
• A42.8 Other forms of actinomycosis
• A42.81 Actinomycotic meningitis
• A42.82 Actinomycotic encephalitis