1. ICD-10-CM Codes
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2. A00-B99 Certain infectious and parasitic diseases
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3. A75-A79 Rickettsioses
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4. A77- Spotted fever [tick-borne rickettsioses]
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5. 2021 ICD-10-CM Diagnosis Code A77.0

2021 ICD-10-CM Diagnosis Code A77.0

Spotted fever due to Rickettsia rickettsii

2016 2017 2018 2019 2020 2021 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 2021 edition of ICD-10-CM A77.0 became effective on October 1, 2020.
• This is the American ICD-10-CM version of A77.0 - other international versions of ICD-10 A77.0 may differ.

• Rocky mountain spotted fever

• 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.

• 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

• 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
• 2021 (effective 10/1/2020): No change

• 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 2021 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 2021 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 2021 Billable/Specific Code

  Applicable To

  • Typhus (fever) NOS
  • Sao Paulo A77.0

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