2020 ICD-10-CM Diagnosis Code A77.0

Spotted fever due to Rickettsia rickettsii

    2016 2017 2018 2019 2020 Billable/Specific Code
  • A77.0 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM A77.0 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of A77.0 - other international versions of ICD-10 A77.0 may differ.
Applicable To
  • Rocky Mountain spotted fever
  • Sao Paulo fever
The following code(s) above A77.0 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to A77.0:
  • A00-B99
    2020 ICD-10-CM Range A00-B99

    Certain infectious and parasitic diseases

    Includes
    • diseases generally recognized as communicable or transmissible
    Type 1 Excludes
    • certain localized infections - see body system-related chapters
    Type 2 Excludes
    • carrier or suspected carrier of infectious disease (Z22.-)
    • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
    • infectious and parasitic diseases specific to the perinatal period (P35-P39)
    • influenza and other acute respiratory infections (J00-J22)
    Use Additional
    • code to identify resistance to antimicrobial drugs (Z16.-)
    Certain infectious and parasitic diseases
Approximate Synonyms
  • Rocky mountain spotted fever
Clinical Information
  • Acute, infectious, sometimes fatal disease caused by rickettsia rickettsii usually transmitted by ixodid ticks; occurs only in north and south america; manifestations include chills, fever, rash, headache, myalgia, and prostration.
  • An acute febrile illness caused by rickettsia rickettsii. It is transmitted to humans by bites of infected ticks and occurs only in north and south america. Characteristics include a sudden onset with headache and chills and fever lasting about two to three weeks. A cutaneous rash commonly appears on the extremities and trunk about the fourth day of illness.
ICD-10-CM A77.0 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 867 Other infectious and parasitic diseases diagnoses with mcc
  • 868 Other infectious and parasitic diseases diagnoses with cc
  • 869 Other infectious and parasitic diseases diagnoses without cc/mcc

Convert A77.0 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change

Diagnosis Index entries containing back-references to A77.0:
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) R50.9
    ICD-10-CM Diagnosis Code R50.9

    Fever, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Fever NOS
    • Fever of unknown origin [FUO]
    • Fever with chills
    • Fever with rigors
    • Hyperpyrexia NOS
    • Persistent fever
    • Pyrexia NOS
    • American
      • spotted A77.0
    • mountain - see also Brucellosis
      • meaning Rocky Mountain spotted fever A77.0
    • spotted A77.9
      ICD-10-CM Diagnosis Code A77.9

      Spotted fever, unspecified

        2016 2017 2018 2019 2020 Billable/Specific Code
      Applicable To
      • Tick-borne typhus NOS
      • due to Rickettsia
        • rickettsii A77.0
      • American A77.0
      • Brazilian A77.0
      • Colombian A77.0
      • Rocky Mountain A77.0
    • Bullis A77.0
    • Lone Star A77.0
    • Rocky Mountain spotted A77.0
    • Sao Paulo A77.0
  • Lone Star fever A77.0
  • Rocky Mountain A77.0 (spotted)
  • Sao Paulo fever or typhus A77.0
  • Typhus (fever) A75.9
    ICD-10-CM Diagnosis Code A75.9

    Typhus fever, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Typhus (fever) NOS
    • Sao Paulo A77.0

ICD-10-CM Codes Adjacent To A77.0
A74.81 Chlamydial peritonitis
A74.89 Other chlamydial diseases
A74.9 Chlamydial infection, unspecified
A75 Typhus fever
A75.0 Epidemic louse-borne typhus fever due to Rickettsia prowazekii
A75.1 Recrudescent typhus [Brill's disease]
A75.2 Typhus fever due to Rickettsia typhi
A75.3 Typhus fever due to Rickettsia tsutsugamushi
A75.9 Typhus fever, unspecified
A77 Spotted fever [tick-borne rickettsioses]
A77.0 Spotted fever due to Rickettsia rickettsii
A77.1 Spotted fever due to Rickettsia conorii
A77.2 Spotted fever due to Rickettsia siberica
A77.3 Spotted fever due to Rickettsia australis
A77.4 Ehrlichiosis
A77.40 …… unspecified
A77.41 …… chafeensis [E. chafeensis]
A77.49 Other ehrlichiosis
A77.8 Other spotted fevers
A77.9 Spotted fever, unspecified
A78 Q fever

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.