A42 – Actinomycosis
ICD-10-CM 2027 diagnosis code · Other bacterial diseases
ICD-10-CM code
A42
- Code
A42(claims format:A42)- Description
- Actinomycosis
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 1. Certain infectious and parasitic diseases (A00-B99)
- Block
- A30-A49 Other bacterial diseases
Billable codes under A42
A42 is a header code and cannot be used on claims. Choose the most specific code:
- A42.0 – Pulmonary actinomycosisBillable
- A42.1 – Abdominal actinomycosisBillable
- A42.2 – Cervicofacial actinomycosisBillable
- A42.7 – Actinomycotic sepsisBillable
- A42.8 – Other forms of actinomycosisHeader (more codes below)
- A42.9 – Actinomycosis, unspecifiedBillable
Notes for A42
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, in the block A30-A49 (Other bacterial diseases).
Is A42 a billable code?
No. A42 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.