A43 – Nocardiosis
ICD-10-CM 2027 diagnosis code · Other bacterial diseases
ICD-10-CM code
A43
- Code
A43(claims format:A43)- Description
- Nocardiosis
- 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 A43
A43 is a header code and cannot be used on claims. Choose the most specific code:
- A43.0 – Pulmonary nocardiosisBillable
- A43.1 – Cutaneous nocardiosisBillable
- A43.8 – Other forms of nocardiosisBillable
- A43.9 – Nocardiosis, unspecifiedBillable
Frequently asked questions
What is ICD-10 code A43?
A43 is the ICD-10-CM code for nocardiosis, in the block A30-A49 (Other bacterial diseases).
Is A43 a billable code?
No. A43 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.