Rickettsioses (A75-A79) ICD-10-CM
The A75–A79 section covers rickettsioses with 26 ICD-10-CM diagnosis codes, of which 21 are billable in fiscal year 2027. The section is organized into the 4 code ranges listed below.
Code Ranges in This Section 4 ranges · 26 codes
| Code Range | Title | Codes | Billable |
|---|---|---|---|
| A75 | Typhus fever (A75) | 6 | 5 |
| A77 | Spotted fever [tick-borne rickettsioses] (A77) | 11 | 9 |
| A78 | Q fever (A78) | 1 | 1 |
| A79 | Other rickettsioses (A79) | 8 | 6 |
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the A75–A79 Code Range
Typhus fever, tick-borne spotted fevers, Q fever, trench fever, and rickettsialpox are among the infections grouped here.
A75 separates typhus fever by its named cause, returning typhus called Brill's disease, or an unspecified cause. A77 separates spotted fevers by their named cause, with entries for ehrlichiosis and other or unspecified spotted fevers.
A78 covers Q fever, an acute infection caused by Coxiella burnetii. A79 separates trench fever, rickettsialpox, and other specified or unspecified rickettsioses.
Questions About This Page
How many codes are in the A75-A79 range?
The A75-A79 range contains 26 ICD-10-CM diagnosis codes in FY 2027. 21 of them are billable, and the rest are category headers that organize the section.
What conditions does A75-A79 cover?
The range covers rickettsioses. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
