ICD-10 Code for Mycobacterium

The default ICD-10-CM 2027 code for mycobacterium, mycobacterial (infection) is A31.9 – Mycobacterial infection, unspecified. More specific codes depend on the details documented, as listed in the official index (5 codes, 5 billable).

Main code: A31.9 – Mycobacterial infection, unspecified
Billable: Yes

Index entries for Mycobacterium

anonymous – A31.9
atypical – A31.9
- cutaneous – A31.1
- pulmonary – A31.0
  - tuberculous – see Tuberculosis, pulmonary
- specified site NEC – A31.8
avium (intracellulare complex) – A31.0
balnei – A31.1
Battey – A31.0
chelonei – A31.8
cutaneous – A31.1
extrapulmonary systemic – A31.8
fortuitum – A31.8
intracellulare (Battey bacillus) – A31.0
kansasii (yellow bacillus) – A31.0
kakaferifu – A31.8
kasongo – A31.8
leprae – A30.9 – see also Leprosy
luciflavum – A31.1
marinum (M. balnei) – A31.1
nonspecific – see Mycobacterium, atypical
pulmonary (atypical) – A31.0
- tuberculous – see Tuberculosis, pulmonary
scrofulaceum – A31.8
simiae – A31.8
systemic, extrapulmonary – A31.8
szulgai – A31.8
terrae – A31.8
triviale – A31.8
tuberculosis (human, bovine) – see Tuberculosis
ulcerans – A31.1
xenopi – A31.8

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.