A42.1

What This Code Means

Abdominal actinomycosis is a serious bacterial infection caused by Actinomyces bacteria that affects the organs and tissues in the belly, often causing abscesses and inflammation. This infection typically develops slowly and may follow abdominal surgery or trauma.

Coding Tips

• •Verify the infection site is specifically abdominal (not thoracic, cervicofacial, or other sites) as actinomycosis codes vary by location
• •Ensure documentation confirms actinomycosis diagnosis and specifies abdominal involvement; may need to code any associated complications or secondary infections separately