A31Header code — not billable

Infection due to other mycobacteria

Chapter
1. Certain infectious and parasitic diseases
Category
A31
Effective date
October 1, 2026

Related codes in category A31

A31.0Pulmonary mycobacterial infectionYesA31.1Cutaneous mycobacterial infectionYesA31.2Dissem mycobacterium avium-intracellulare complex (DMAC)YesA31.8Other mycobacterial infectionsYesA31.9Mycobacterial infection, unspecifiedYes

Frequently asked questions

What is ICD-10 code A31?

A31 is an ICD-10-CM diagnosis code for Infection due to other mycobacteria.

Is A31 a billable code?

No. A31 is a category/header code, not billable on its own — use one of its more specific child codes instead.

What ICD-10-CM chapter is A31 in?

A31 falls under Chapter 1: Certain infectious and parasitic diseases.

When did A31 become effective?

A31 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to A31?

A31 belongs to category A31, which includes 5 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.