DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

A31 Infection due to other mycobacteria

  • Header · not billable

A31 is not billable. The category heads 5 billable codes in FY2027: the 5 codes directly below it.

Index → code

  • Buruli ulcer → A31.1
  • Battey Mycobacterium infection → A31.0
  • Mycobacterium, mycobacterial (infection) → A31.9

Where it sits

  1. Chapter 1 Certain infectious and parasitic diseases (A00-B99)
  2. A30-A49 Other bacterial diseases (A30-A49)
  3. A31 Infection due to other mycobacteria
Billable codes
5
Subdivisions
5
CC / MCC codes
5 / 0
HCC V28 codes
2
New FY2027
0
Index entries
45

Codes in A31

  1. A31.0
    Pulmonary mycobacterial infection
    BillableCC6
    Inclusion terms 3

    Inclusion terms

    • Infection due to Mycobacterium avium
    • Infection due to Mycobacterium intracellulare [Battey bacillus]
    • Infection due to Mycobacterium kansasii
  2. A31.1
    Cutaneous mycobacterial infection
    BillableCC
    Inclusion terms 3

    Inclusion terms

    • Buruli ulcer
    • Infection due to Mycobacterium marinum
    • Infection due to Mycobacterium ulcerans
  3. A31.2
    Disseminated mycobacterium avium-intracellulare complex (DMAC)
    BillableCC6
    Inclusion terms 1

    Inclusion terms

    • MAC sepsis
  4. A31.8
    Other mycobacterial infections
    BillableCC
  5. A31.9
    Mycobacterial infection, unspecified
    BillableCC
    Inclusion terms 2

    Inclusion terms

    • Atypical mycobacterial infection NOS
    • Mycobacteriosis NOS

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

At A31

Excludes2

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

Notes that also apply

Chapter 1 instructions (Includes 1, Excludes2 5, Use additional code 1): printed on the chapter 1 page.

Index entries

  • Battey Mycobacterium infection → A31.0
  • Buruli ulcer → A31.1
  • DMAC (disseminated mycobacterium avium- intracellulare complex) → A31.2
  • Mycobacterium, mycobacterial (infection) → A31.9
  • Disease, diseasedBattey → A31.0
  • Disease, diseasedphotochromogenic (acid-fast bacilli) (pulmonary) → A31.0
  • Mycobacterium, mycobacterial (infection)avium (intracellulare complex) → A31.0
  • Mycobacterium, mycobacterial (infection)Battey → A31.0
  • Mycobacterium, mycobacterial (infection)intracellulare (Battey bacillus) → A31.0
  • Mycobacterium, mycobacterial (infection)kansasii (yellow bacillus) → A31.0
  • Mycobacterium, mycobacterial (infection)pulmonary (atypical) → A31.0
  • Disease, diseasedswimming-pool granuloma → A31.1
  • Granulomaswimming pool → A31.1
  • Infection, infected, infective (opportunistic)swimming pool bacillus → A31.1
  • Mycobacterium, mycobacterial (infection)balnei → A31.1
  • Mycobacterium, mycobacterial (infection)cutaneous → A31.1
  • Mycobacterium, mycobacterial (infection)luciflavum → A31.1
  • Mycobacterium, mycobacterial (infection)marinum (M. balnei) → A31.1
  • Mycobacterium, mycobacterial (infection)ulcerans → A31.1
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativeBuruli → A31.1
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativemycobacterial (skin) → A31.1
  • Complexdisseminated mycobacterium avium- intracellulare (DMAC) → A31.2
  • Lymphadenitismycobacterial → A31.8
  • Mycobacterium, mycobacterial (infection)chelonei → A31.8
  • Mycobacterium, mycobacterial (infection)extrapulmonary systemic → A31.8
  • Mycobacterium, mycobacterial (infection)fortuitum → A31.8
  • Mycobacterium, mycobacterial (infection)kakaferifu → A31.8
  • Mycobacterium, mycobacterial (infection)kasongo → A31.8
  • Mycobacterium, mycobacterial (infection)scrofulaceum → A31.8
  • Mycobacterium, mycobacterial (infection)simiae → A31.8
  • Mycobacterium, mycobacterial (infection)systemic, extrapulmonary → A31.8
  • Mycobacterium, mycobacterial (infection)szulgai → A31.8
  • Mycobacterium, mycobacterial (infection)terrae → A31.8
  • Mycobacterium, mycobacterial (infection)triviale → A31.8
  • Mycobacterium, mycobacterial (infection)xenopi → A31.8
  • Mycobacterium, mycobacterial (infection)anonymous → A31.9
  • Mycobacterium, mycobacterial (infection)atypical → A31.9
  • Infection, infected, infective (opportunistic)lungatypical Mycobacterium → A31.0
  • Mycobacterium, mycobacterial (infection)atypicalpulmonary → A31.0
  • Infection, infected, infective (opportunistic)Bacillusswimming pool → A31.1

5 more, longer entries are not listed; the search box finds them by word.

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy