2027 ICD-10-CM Diagnosis Code A31Infection due to other mycobacteria

ICD-10-CM Codes›A00–B99›A30-A49›A31

ICD-10-CM A31
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

A31 is a non-billable ICD-10-CM category code for infection due to other mycobacteria, so it cannot be submitted on claims. Use a more specific code from this category instead, such as A31.0, A31.1, A31.2, and A31.8.

Code Identity

ICD-10-CM Code
A31
Billable Status
No — Non-Billable Category
Code Describes
Infection due to other mycobacteria
Short Description
Infection due to other mycobacteria
Same as the full description in the CMS dataset.
Chapter
A30-A49
Other bacterial diseases

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA30-A49Other bacterial diseases
CategoryA31Infection due to other mycobacteria
This CodeA31Infection due to other mycobacteria

Specific Coding for Infection due to other mycobacteriaOverview

Non-specific codes like A31 require more characters. Use one of these billable codes instead:

  • Use A31.0 for Pulmonary mycobacterial infection

  • Use A31.1 for Cutaneous mycobacterial infection

  • Use A31.2 for Disseminated mycobacterium avium-intracellulare complex (DMAC)

  • Use A31.8 for Other mycobacterial infections

  • Use A31.9 for Mycobacterial infection, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to A31: its own notes plus those printed at Chapter 1. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

On A31 itself
From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • carrier or suspected carrier of infectious disease (Z22.-)
  • certain localized infections - see body system-related chapters
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • code to identify resistance to antimicrobial drugs (Z16.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Patient EducationClinical

Mycobacterial Infections

Mycobacteria are a type of germ. There are many different kinds. The most common one causes tuberculosis. Another one causes leprosy. Still others cause infections that are called atypical mycobacterial infections. They aren't "typical" because they don't cause tuberculosis.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About A31Overview

What is the ICD-10 code for infection due to other mycobacteria?

A31 is the ICD-10-CM category for infection due to other mycobacteria, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is A31 (Infection due to other mycobacteria) a billable code?

No. This is a category header that groups the codes for infection due to other mycobacteria, and headers cannot be submitted on claims. Claims for infection due to other mycobacteria need a more specific code from this category, such as A31.0, A31.1, and A31.2.