2021 ICD-10-CM Code A31

Infection due to other mycobacteria

Version 2021

Not Valid for Submission

A31 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of infection due to other mycobacteria. The code is not specific and is NOT valid for the year 2021 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

ICD-10:A31
Short Description:Infection due to other mycobacteria
Long Description:Infection due to other mycobacteria

Code Classification

Specific Coding for Infection due to other mycobacteria

Non-specific codes like A31 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10 codes with a higher level of specificity when coding for infection due to other mycobacteria:

  • BILLABLE CODE - Use A31.0 for Pulmonary mycobacterial infection
  • BILLABLE CODE - Use A31.1 for Cutaneous mycobacterial infection
  • BILLABLE CODE - Use A31.2 for Disseminated mycobacterium avium-intracellulare complex (DMAC)
  • BILLABLE CODE - Use A31.8 for Other mycobacterial infections
  • BILLABLE CODE - Use A31.9 for Mycobacterial infection, unspecified

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code A31:


Type 2 Excludes

Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

Information for Patients


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. But they can still harm people, especially people with other problems that affect their immunity, such as AIDS.

Sometimes you can have these infections with no symptoms at all. At other times, they can cause lung symptoms similar to tuberculosis:

Medicines can treat these infections, but often more than one is needed to cure the infection.


[Learn More in MedlinePlus]

Code History

  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016 (First year ICD-10-CM implemented into the HIPAA code set)