DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

A79 Other rickettsioses

  • Header · not billable

A79 is not billable. The category heads 6 billable codes in FY2027, grouped under 4 subdivisions.

Index → code

Where it sits

  1. Chapter 1 Certain infectious and parasitic diseases (A00-B99)
  2. A75-A79 Rickettsioses (A75-A79)
  3. A79 Other rickettsioses
Billable codes
6
Subdivisions
4
CC / MCC codes
6 / 0
HCC V28 codes
0
New FY2027
0
Index entries
33

Codes in A79

  1. A79.0
    Trench fever
    BillableCC
    Inclusion terms 2

    Inclusion terms

    • Quintan fever
    • Wolhynian fever
  2. A79.1
    Rickettsialpox due to Rickettsia akari
    BillableCC
    Inclusion terms 2

    Inclusion terms

    • Kew Garden fever
    • Vesicular rickettsiosis
  3. A79.8
    Other specified rickettsioses
    Header
  4. A79.81
    Rickettsiosis due to Ehrlichia sennetsu
    BillableCC
    Inclusion terms 1

    Inclusion terms

    • Rickettsiosis due to Neorickettsia sennetsu
  5. A79.82
    Anaplasmosis [A. phagocytophilum]
    BillableCC
    Inclusion terms 1

    Inclusion terms

    • Transfusion transmitted A. phagocytophilum
  6. A79.89
    Other specified rickettsioses
    BillableCC
  7. A79.9
    Rickettsiosis, unspecified
    BillableCC
    Inclusion terms 1

    Inclusion terms

    • Rickettsial infection 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

Notes that also apply

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

Index entries

  • His-Werner disease → A79.0
  • Quintan fever → A79.0
  • Volhynian fever → A79.0
  • Werner-His disease → A79.0
  • Wolhynian fever → A79.0
  • Kew Garden fever → A79.1
  • Rickettsialpox (Rickettsia akari) → A79.1
  • Anaplasmosis [A. phagocytophilum] (transfusion transmitted) → A79.82
  • Rickettsial disease → A79.9
  • Rickettsiosis → A79.9
  • Disease, diseasedHis (-Werner) (trench fever) → A79.0
  • Disease, diseasedWerner-His (trench fever) → A79.0
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)five day → A79.0
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)Meuse → A79.0
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)quintan → A79.0
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)shin-bone → A79.0
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)trench → A79.0
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)Volhynian → A79.0
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)Wolhynian → A79.0
  • Infection, infected, infective (opportunistic)trench fever → A79.0
  • Trenchfever → A79.0
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)Kew Garden → A79.1
  • Rickettsiosisvesicular → A79.1
  • Angiomatosisbacillary → A79.89
  • Rickettsial diseasespecified type NEC → A79.89
  • Rickettsiosisspecified type NEC → A79.89
  • Disease, diseasedrickettsial NOS → A79.9
  • Infection, infected, infective (opportunistic)rickettsial NOS → A79.9
  • Rickettsiosisdue toRickettsia akari (rickettsialpox) → A79.1
  • Ehrlichiosisdue toE. sennetsu → A79.81
  • Rickettsiosisdue toEhrlichia sennetsu → A79.81
  • Rickettsiosisdue toNeorickettsia sennetsu → A79.81
  • Disease, diseasedrickettsial NOSspecified type NEC → A79.89

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

Hierarchy