Other rickettsioses (A79) ICD-10-CM
The A79 code range covers other rickettsioses with 8 ICD-10-CM diagnosis codes. 6 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Codes in the A79 Range 8 codes · 6 billable
- A79 Other rickettsiosesNon-billable
- A79.0 Trench fever
- A79.1 Rickettsialpox due to Rickettsia akari
- A79.8 Other specified rickettsiosesNon-billable
- A79.81 Rickettsiosis due to Ehrlichia sennetsu
- A79.82 Anaplasmosis [A. phagocytophilum]
- A79.89 Other specified rickettsioses
- A79.9 Rickettsiosis, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the A79 range.
Rickettsia Infections
Infections by the genus RICKETTSIA.
Trench Fever
An intermittent fever characterized by intervals of chills, fever, and splenomegaly each of which may last as long as 40 hours. It is caused by BARTONELLA QUINTANA and transmitted by the human louse.
About the A79 Code Range
Rickettsioses are infectious diseases. This category includes trench fever, rickettsialpox, anaplasmosis and other specified or unspecified rickettsioses.
A79.0 identifies trench fever, while A79.1 identifies rickettsialpox due to Rickettsia akari. Under other specified rickettsioses, A79.81 names Ehrlichia sennetsu, A79.82 names anaplasmosis, and A79.89 covers other specified rickettsioses. A79.9 identifies unspecified rickettsiosis.
Questions About This Page
How many billable codes are in the A79 range?
Of the 8 codes in this range, 6 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the A79 range classify?
The range classifies other rickettsioses. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
