DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

A77 Spotted fever [tick-borne rickettsioses]

  • Header · not billable

A77 is not billable. The category heads 9 billable codes in FY2027, grouped under 7 subdivisions.

Index → code

Where it sits

  1. Chapter 1 Certain infectious and parasitic diseases (A00-B99)
  2. A75-A79 Rickettsioses (A75-A79)
  3. A77 Spotted fever [tick-borne rickettsioses]
Billable codes
9
Subdivisions
7
CC / MCC codes
9 / 0
HCC V28 codes
0
New FY2027
0
Index entries
59

Codes in A77

  1. A77.0
    Spotted fever due to Rickettsia rickettsii
    BillableCC
    Inclusion terms 2

    Inclusion terms

    • Rocky Mountain spotted fever
    • Sao Paulo fever
  2. A77.1
    Spotted fever due to Rickettsia conorii
    BillableCC
    Inclusion terms 6

    Inclusion terms

    • African tick typhus
    • Boutonneuse fever
    • India tick typhus
    • Kenya tick typhus
    • Marseilles fever
    • Mediterranean tick fever
  3. A77.2
    Spotted fever due to Rickettsia siberica
    BillableCC
    Inclusion terms 2

    Inclusion terms

    • North Asian tick fever
    • Siberian tick typhus
  4. A77.3
    Spotted fever due to Rickettsia australis
    BillableCC
    Inclusion terms 1

    Inclusion terms

    • Queensland tick typhus
  5. A77.4
    Ehrlichiosis
    Header
    Excludes1 2

    Excludes1

    • anaplasmosis [A. phagocytophilum] (A79.82) A79.82
    • rickettsiosis due to Ehrlichia sennetsu (A79.81) A79.81
  6. A77.40
    Ehrlichiosis, unspecified
    BillableCC
  7. A77.41
    Ehrlichiosis chaffeensis [E. chaffeensis]
    BillableCC
  8. A77.49
    Other ehrlichiosis
    BillableCC
    Inclusion terms 2

    Inclusion terms

    • Ehrlichiosis due to E. ewingii
    • Ehrlichiosis due to E. muris euclairensis
  9. A77.8
    Other spotted fevers
    BillableCC
    Inclusion terms 3

    Inclusion terms

    • Rickettsia 364D/R. philipii (Pacific Coast tick fever)
    • Spotted fever due to Rickettsia africae (African tick bite fever)
    • Spotted fever due to Rickettsia parkeri
  10. A77.9
    Spotted fever, unspecified
    BillableCC
    Inclusion terms 1

    Inclusion terms

    • Tick-borne typhus 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

  • Lone Star fever → A77.0
  • Rocky Mountain (spotted) fever → A77.0
  • Sao Paulo fever or typhus → A77.0
  • Kenya fever → A77.1
  • Marseilles fever → A77.1
  • Queensland fever → A77.3
  • Ehrlichiosis → A77.40
  • Rickettsia 364D/R. philipii (Pacific Coast tick fever) → A77.8
  • Spotted fever → A77.9
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)Bullis → A77.0
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)Lone Star → A77.0
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)Rocky Mountain spotted → A77.0
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)Sao Paulo → A77.0
  • Typhus (fever)Sao Paulo → A77.0
  • Disease, diseasedConor and Bruch's (boutonneuse fever) → A77.1
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)boutonneuse → A77.1
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)Kenya (tick) → A77.1
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)Marseilles → A77.1
  • Mediterraneantick fever → A77.1
  • Typhus (fever)African tick → A77.1
  • Typhus (fever)India tick → A77.1
  • Typhus (fever)Kenya (tick) → A77.1
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)North Asian tick-borne → A77.2
  • Typhus (fever)North Asian tick-borne → A77.2
  • Typhus (fever)Siberian tick → A77.2
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)Queensland (coastal) (tick) → A77.3
  • Typhus (fever)Queensland tick → A77.3
  • Anaplasmosis [A. phagocytophilum] (transfusion transmitted)human → A77.49
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)African tick bite → A77.8
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)pacific coast tick → A77.8
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)spotted → A77.9
  • Rickettsiosistick-borne → A77.9
  • Typhus (fever)tick-borne → A77.9
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)Americanspotted → A77.0
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)mountainmeaning Rocky Mountain spotted fever → A77.0
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)spottedAmerican → A77.0
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)spottedBrazilian → A77.0
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)spottedColombian → A77.0
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)spottedRocky Mountain → A77.0
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)Mediterraneantick → A77.1

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

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

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