DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

A23 Brucellosis

  • Header · not billable

A23 is not billable. The category heads 6 billable codes in FY2027: the 6 codes directly below it.

Index → code

Where it sits

  1. Chapter 1 Certain infectious and parasitic diseases (A00-B99)
  2. A20-A28 Certain zoonotic bacterial diseases (A20-A28)
  3. A23 Brucellosis
Billable codes
6
Subdivisions
6
CC / MCC codes
2 / 0
HCC V28 codes
0
New FY2027
0
Index entries
43

Codes in A23

  1. A23.0
    Brucellosis due to Brucella melitensis
    Billable
  2. A23.1
    Brucellosis due to Brucella abortus
    Billable
  3. A23.2
    Brucellosis due to Brucella suis
    Billable
  4. A23.3
    Brucellosis due to Brucella canis
    Billable
  5. A23.8
    Other brucellosis
    BillableCC
  6. A23.9
    Brucellosis, unspecified
    BillableCC

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 A23

Includes

  • Malta fever
  • Mediterranean fever
  • undulant fever

Notes that also apply

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

Index entries

  • Bruce sepsis → A23.0
  • Melitensis, febris → A23.0
  • Abortus fever → A23.1
  • Bang's disease (brucella abortus) → A23.1
  • Brucellosis (infection) → A23.9
  • Brucellosis (infection)melitensis → A23.0
  • Febris, febrilemelitensis → A23.0
  • Bacillusabortus infection → A23.1
  • Brucellosis (infection)abortus → A23.1
  • Disease, diseasedBang's (brucella abortus) → A23.1
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)abortus → A23.1
  • Brucellosis (infection)suis → A23.2
  • Brucellosis (infection)canis → A23.3
  • Brucellosis (infection)mixed → A23.8
  • Brucellosis (infection)dermatitis → A23.9
  • Brucellosis (infection)sepsis → A23.9
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)Malta → A23.9
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)Mediterranean → A23.9
  • Infection, infected, infective (opportunistic)Brucella → A23.9
  • Sepsis (generalized) (unspecified organism)Brucella → A23.9
  • Brucellosis (infection)sepsismelitensis → A23.0
  • Infection, infected, infective (opportunistic)Bacillusmelitensis → A23.0
  • Infection, infected, infective (opportunistic)Brucellamelitensis → A23.0
  • Infection, infected, infective (opportunistic)Bacillusabortus → A23.1
  • Infection, infected, infective (opportunistic)Brucellaabortus → A23.1
  • Infection, infected, infective (opportunistic)Brucellasuis → A23.2
  • Infection, infected, infective (opportunistic)Brucellacanis → A23.3
  • Brucellosis (infection)sepsisspecified NEC → A23.8
  • Infection, infected, infective (opportunistic)Brucellamixed → A23.8
  • Infection, infected, infective (opportunistic)Brucellaspecified NEC → A23.8
  • Disorder (of)tubulo-interstitial (in)brucellosis → A23.9 [N16]
  • Pyelonephritisin (due to)brucellosis → A23.9 [N16]
  • Spondylitis (chronic)in (due to)brucellosis → A23.9 [M49.80]
  • Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic)tubulo-interstitial (in)due tobrucellosis → A23.9 [N16]
  • Spondylitis (chronic)in (due to)brucellosiscervical region → A23.9 [M49.82]
  • Spondylitis (chronic)in (due to)brucellosiscervicothoracic region → A23.9 [M49.83]
  • Spondylitis (chronic)in (due to)brucellosislumbar region → A23.9 [M49.86]
  • Spondylitis (chronic)in (due to)brucellosislumbosacral region → A23.9 [M49.87]
  • Spondylitis (chronic)in (due to)brucellosismultiple sites → A23.9 [M49.89]
  • Spondylitis (chronic)in (due to)brucellosisoccipito-atlanto-axial region → A23.9 [M49.81]

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

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