ICD-10-CM A42 is the diagnosis code for Actinomycosis. This code falls under the section "Other bacterial diseases" within Chapter 1 — Certain infectious and parasitic diseases (A00-B99). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as A42. They are mutually exclusive:
Understanding where A42 sits in the ICD-10-CM classification helps ensure proper coding:
No, A42 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
A42 is the ICD-10-CM diagnosis code for "Actinomycosis". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
A42 is located in Section A30-A49 — "Other bacterial diseases" within Chapter 1 of the ICD-10-CM Tabular List.
A42 has 6 sub-code(s) that provide more specific detail: A42.0, A42.1, A42.2, A42.7, A42.8 and more.
Use A42 when the patients documented diagnosis matches "Actinomycosis" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Actinomycosis is A42.
No, A42 is non-billable. Use a more specific sub-code for primary diagnosis billing.
A42 is in Chapter 1 of the ICD-10-CM Tabular List.
Type 1 Excludes for A42 include: actinomycetoma (B47.1).
Yes, A42 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.