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A31.9

✓ Billable

Mycobacterial infection, unspecified

Certain infectious and parasitic diseases (A00-B99)

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Also Known As

Atypical mycobacterial infection NOSMycobacteriosis NOS

⚠️ Excludes2

inherited from A31

Rules from parent category A31: Infection due to other mycobacteria

  • • leprosy (A30.-)
  • • tuberculosis (A15-A19)

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Code Information

CodeA31.9
BillableYes
ParentA31
CategoryCertain infectious and parasitic diseases (A00-B99)
Excludes10 rule(s)
Excludes22 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)