Other forms of actinomycosis

This code represents various atypical presentations of actinomycosis, a chronic bacterial infection caused by Actinomyces species. These infections are characterized by abscess formation, tissue fibrosis, and draining sinuses, often affecting areas beyond the commonly recognized cervicofacial, thoracic, or abdominal sites.

Use this code when documentation specifies actinomycosis affecting unusual anatomical locations (e.g., musculoskeletal, central nervous system, pelvic in males) or when the specific form is not otherwise classified. Supporting documentation should clearly identify Actinomyces infection and the affected site, ruling out more common presentations.

• Ensure the documentation explicitly states "actinomycosis" and specifies a site not covered by more specific codes (A42.0-A42.7).
• Do not use this code if the actinomycosis is clearly cervicofacial, thoracic, abdominal, or pelvic (in females), as more specific codes exist.
• Consider sequencing this code as a primary diagnosis when the actinomycosis is the reason for the encounter, or as a secondary diagnosis when it's a co-morbidity.