A42 Actinomycosis

⚠ Non-Billable ICD-10-CM 2026
Create your free account → Open A42 in the app →

Get what a quick lookup can't: the AI assistant for official-guideline questions, HCC risk-adjustment mappings (CMS-HCC V24/V28, RxHCC), FDA drug indications, and AHA Coding Clinic references for A42.

The ICD-10-CM code for Actinomycosis is A42 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Section
A30-A49: Other bacterial diseases (A30-A49)
Category A42
10 codes (8 billable)
FY2026 Status
Stable since FY2024
Excludes1
Not coded here. These conditions should NOT be coded together with A42.
  • actinomycetoma (B47.1)

Official Coding Guidelines

HIV Infections (TOC entry)

a. Human Immunodeficiency Virus (HIV) Infections .............................................................. 19

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.1.a
Infectious agents causing diseases in other chapters (TOC)

b. Infectious agents as the cause of diseases classified to other chapters ................................. 22

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.1.b

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

Cite This Page

Reference A42 with the canonical source and edition:

A42 — Actinomycosis. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/A42

Canonical URL: https://icd10codingpro.com/codes/A42

Related Codes

More Specific Codes

A42.0 Pulmonary actinomycosis A42.1 Abdominal actinomycosis A42.2 Cervicofacial actinomycosis A42.7 Actinomycotic sepsis A42.8 Other forms of actinomycosis A42.9 Actinomycosis, unspecified

All Codes in A42

Every most-specific code under A42 Actinomycosis (8 codes):

Show the complete A42 code list
A42.0 Pulmonary actinomycosis A42.1 Abdominal actinomycosis A42.2 Cervicofacial actinomycosis A42.7 Actinomycotic sepsis A42.81 Actinomycotic meningitis A42.82 Actinomycotic encephalitis A42.89 Other forms of actinomycosis A42.9 Actinomycosis, unspecified
Search all 70,000+ ICD-10-CM codes →
Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

Get HCC Mappings, Clinical Summaries, and More

Access premium features including HCC risk adjustment, FDA drug indications, AI coding assistant, and comprehensive clinical context.

Start Free Trial