A31.0 Pulmonary mycobacterial infection

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applicable to

• Infection due to Mycobacterium avium
• Infection due to Mycobacterium intracellulare [Battey bacillus]
• Infection due to Mycobacterium kansasii

Applies from A31 Infection due to other mycobacteria

Excludes2 (not included here)

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

Risk adjustment (HCC)

• CMS-HCC V28: HCC 6 — Opportunistic Infections
• CMS-HCC V22: HCC 6 — Opportunistic Infections
• RxHCC V08: HCC 5 — Opportunistic Infections
• ESRD V24: HCC 6

MS-DRG index

Defines the logic of DRG(s) 177-179 in MDC 04.

Approximate ICD-9-CM (GEMs)

• 031.0 Pulmonary diseases due to other mycobacteria

Diagnosis Index entries for A31.0

• Battey Mycobacterium infection
• Disease, diseased › Battey
• Disease, diseased › photochromogenic (acid-fast bacilli) (pulmonary)
• Infection, infected, infective (opportunistic) › lung › atypical Mycobacterium
• Mycobacterium, mycobacterial (infection) › atypical › pulmonary
• Mycobacterium, mycobacterial (infection) › avium (intracellulare complex)
• Mycobacterium, mycobacterial (infection) › Battey
• Mycobacterium, mycobacterial (infection) › intracellulare (Battey bacillus)
• Mycobacterium, mycobacterial (infection) › kansasii (yellow bacillus)
• Mycobacterium, mycobacterial (infection) › pulmonary (atypical)

Nearby codes

• A31 Infection due to other mycobacteria
• A31.0 Pulmonary mycobacterial infection (this code)
• A31.1 Cutaneous mycobacterial infection
• A31.2 Disseminated mycobacterium avium-intracellulare complex (DMAC)
• A31.8 Other mycobacterial infections
• A31.9 Mycobacterial infection, unspecified