NPI Atlas

A31 – Infection due to other mycobacteria

ICD-10-CM 2027 diagnosis code · Other bacterial diseases

Non-billable header

ICD-10-CM code A31

Code: A31 (claims format: A31)
Description: Infection due to other mycobacteria
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 A31

A31 is a header code and cannot be used on claims. Choose the most specific code:

A31.0 – Pulmonary mycobacterial infectionBillable
A31.1 – Cutaneous mycobacterial infectionBillable
A31.2 – Disseminated mycobacterium avium-intracellulare complex (DMAC)Billable
A31.8 – Other mycobacterial infectionsBillable
A31.9 – Mycobacterial infection, unspecifiedBillable

Notes for A31

Excludes2 (not included here):

leprosy (A30.-)
tuberculosis (A15-A19)

Frequently asked questions

What is ICD-10 code A31?

A31 is the ICD-10-CM code for infection due to other mycobacteria, in the block A30-A49 (Other bacterial diseases).

Is A31 a billable code?

No. A31 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.