A42Header code — not billable

Actinomycosis

Chapter
1. Certain infectious and parasitic diseases
Category
A42
Effective date
October 1, 2026

Related codes in category A42

A42.0Pulmonary actinomycosisYesA42.1Abdominal actinomycosisYesA42.2Cervicofacial actinomycosisYesA42.7Actinomycotic sepsisYesA42.8Other forms of actinomycosisA42.81Actinomycotic meningitisYesA42.82Actinomycotic encephalitisYesA42.89Other forms of actinomycosisYesA42.9Actinomycosis, unspecifiedYes

Frequently asked questions

What is ICD-10 code A42?

A42 is an ICD-10-CM diagnosis code for Actinomycosis.

Is A42 a billable code?

No. A42 is a category/header code, not billable on its own — use one of its more specific child codes instead.

What ICD-10-CM chapter is A42 in?

A42 falls under Chapter 1: Certain infectious and parasitic diseases.

When did A42 become effective?

A42 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to A42?

A42 belongs to category A42, which includes 9 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.