Diagnosis Code


Code Information

Diagnosis Code: A79.9

Short Description: Rickettsiosis, unspecified

Long Description: Rickettsiosis, unspecified

The code A79.9 is VALID for claim submission

Code Classification:

  • Certain infectious and parasitic diseases (A00–B99)
    • Rickettsioses (A75-A79)
      • Other rickettsioses (A79)
        • A79.9 Rickettsiosis, unspecified

Code Version: 2022 ICD-10-CM


  • Disease caused by rickettsiae
  • Disease due to Rickettsia
  • Disease due to Rickettsiales
  • Encephalitis due to rickettsia
  • Myocarditis due to Genus Rickettsia
  • Rickettsial endocarditis
  • Rickettsial pneumonia

Diagnostic Related Group(s)

The code A79.9 is grouped in the following Diagnostic Related Group(s) (MS-DRG v39.0)
  • Other Infectious And Parasitic Diseases Diagnoses With Mcc (867)
  • Other Infectious And Parasitic Diseases Diagnoses With Cc (868)
  • Other Infectious And Parasitic Diseases Diagnoses Without Cc/mcc (869)

References to Index of Diseases and Injuries

The code A79.9 has the following ICD-10-CM references to the Index of Diseases and Injuries
  • Inclusion Terms:
    • Rickettsial infection NOS

Crosswalk Information

ICD-10 Code ICD-9 Code ICD-9 Description
A79.9 Right Arrow 083.9 Rickettsiosis NOS

This ICD-10 to ICD-9 data is based on the 2018 General Equivalency Mapping (GEM) files published by the Centers for Medicare & Medicaid Services (CMS) for informational purposes only. The data is not an ICD-10 conversion tool and doesn’t guarantee clinical accuracy.

Similar Codes

ICD-10 Code ICD-10 Description
A79 Other rickettsioses
A79.0 Trench fever
A79.1 Rickettsialpox due to Rickettsia akari
A79.8 Other specified rickettsioses
A79.81 Rickettsiosis due to Ehrlichia sennetsu
A79.82 Anaplasmosis [A. phagocytophilum]
A79.89 Other specified rickettsioses

This page was last updated on: 10/1/2021