ICD-10-CM 2027
ICD-10 code for cutaneous mycobacterium
From the official ICD-10-CM alphabetic index entry “Mycobacterium, mycobacterial (infection) › cutaneous”. Page updated September 29, 2026.
About coding cutaneous mycobacterium
The ICD-10-CM code for cutaneous mycobacterium is A31.1 (Cutaneous mycobacterial infection).
Within A31 (infection due to other mycobacteria), A31.1 is specifically for cutaneous mycobacterial infection. Related codes cover pulmonary mycobacterial infection (A31.0), disseminated mycobacterium avium-intracellulare complex (DMAC) (A31.2), other mycobacterial infections (A31.8) and mycobacterial infection, unspecified (A31.9).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 606 (Minor Skin Disorders with MCC, relative weight 1.5728) and DRG 607 (Minor Skin Disorders without MCC, relative weight 0.8772), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about cutaneous mycobacterium ICD-10 codes
What is the ICD-10 code for cutaneous mycobacterium?
- A31.1 — Cutaneous mycobacterial infection.
Is A31.1 billable?
- Yes. A31.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A31.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A31.1 as a principal diagnosis.
Is A31.1 a CC or MCC?
- A31.1 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.