ICD-10 Code A42.2 – Cervicofacial actinomycosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A42.2 – Cervicofacial actinomycosis
What it is
A42.2 identifies cervicofacial actinomycosis, a chronic bacterial infection involving the face, jaw, or neck. It is typically caused by Actinomyces species and often develops slowly with deep tissue involvement.
Clinical signs
Common findings include a firm swelling in the jaw or neck, draining sinus tracts, and abscess formation. Clinical features vary; refer to documentation for the exact site and extent of infection.
When to use this code
Use A42.2 when the provider documents cervicofacial actinomycosis or actinomycosis affecting the face, jaw, or neck. It applies when the infection is confirmed or clearly described as cervicofacial, even if the note also mentions abscess or sinus drainage.
Check documentation if the record only says “actinomycosis” without a location, because another A42 code may fit better. Code the documented anatomic site and do not assume cervicofacial involvement from dental or neck symptoms alone.
Do not use for
Do not use this code for pulmonary, abdominal, or generalized actinomycosis. It is also incorrect when the chart does not specify cervicofacial involvement; check documentation.
Coding tip
Match the code to the documented body region, and verify that “cervicofacial” is explicitly stated before assigning A42.2.