A42

Non-billable

Actinomycosis

A42 is the ICD-10-CM code for Actinomycosis. It is a non-billable category code — use a more specific child code such as A42.0 for billing.

Status
Header (non-billable)
Chapter
A00-B99
Subcodes
6
Edition
FY2026

A00-B99 Certain infectious and parasitic diseases

Excludes1 — not coded here

  • actinomycetoma (B47.1)

Frequently asked questions

What is ICD-10 code A42?
A42 is the ICD-10-CM code for "Actinomycosis". It falls under A00-B99 Certain infectious and parasitic diseases.
Is A42 a billable code?
No — A42 is a non-billable header code. Use a more specific child code (such as A42.0) for billing.
What are the subcodes of A42?
A42 has 6 more specific child codes, including A42.0, A42.1, A42.2.
What is excluded from A42?
Excludes1 (not coded here): actinomycetoma (B47.1).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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