ICD-10-CM Code A31

Infection due to other mycobacteria

Version 2020 Non-Billable Code

Not Valid for Submission

A31 is a "header" nonspecific and non-billable 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 valid for the year 2020 for the submission of HIPAA-covered transactions.

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

Consider the following ICD-10 codes with a higher level of specificity:

  • A31.0 - Pulmonary mycobacterial infection
  • A31.1 - Cutaneous mycobacterial infection
  • A31.2 - Disseminated mycobacterium avium-intracellulare complex (DMAC)
  • A31.8 - Other mycobacterial infections
  • A31.9 - 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 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.

Code Classification

  • Certain infectious and parasitic diseases (A00–B99)
    • Other bacterial diseases (A30-A49)
      • Infection due to other mycobacteria (A31)

Code History

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

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:

  • Cough
  • Weight loss
  • Coughing up blood or mucus
  • Weakness or fatigue
  • Fever and chills
  • Night sweats
  • Lack of appetite and weight loss

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


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