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  2. ICD-10-CM Codes List
  3. A00–B99
  4. A30-A49
  5. Infection due to other mycobacteria (A31)

Infection due to other mycobacteria (A31)

ICD-10 code A31 and its subcodes identify infections caused by mycobacteria other than tuberculosis and leprosy, known as atypical or non-tuberculous mycobacterial infections. These codes are used to classify various infections affecting lungs, skin, disseminated organs, and other tissues.

The ICD-10 code A31.0 refers specifically to pulmonary mycobacterial infections, including diseases like Mycobacterium kansasii infection, pulmonary Mycobacterium avium complex infection, and Lady Windermere syndrome. This code helps document lung infections from species such as Mycobacterium malmoense, xenopi, and intracellulare. Code A31.1 covers cutaneous mycobacterial infections, including Buruli ulcer and fish tank granuloma, with involvement from species like Mycobacterium marinum and scrofulaceum. The A31.2 code relates to disseminated infections by the Mycobacterium avium-intracellulare complex (DMAC), often seen in compromised immune systems. A31.8 serves for other diverse mycobacterial infections such as mycobacterial arthritis, spondyloarthritis, and keratitis caused by various atypical mycobacteria. The unspecified A31.9 code is used when the infection is identified as mycobacterial but lacks clear localization or specific species diagnosis. Understanding these distinctions supports accurate coding for conditions caused by non-tuberculous mycobacteria, assisting clinicians and coders in precise classification and management.

Instructional Notations

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.

Clinical Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.

Buruli Ulcer

A lesion in the skin and subcutaneous tissues due to infections by MYCOBACTERIUM ULCERANS. It was first reported in Uganda, Africa.

Mycobacterium ulcerans

A slow-growing mycobacterium that infects the skin and subcutaneous tissues, giving rise to indolent BURULI ULCER.