Rickettsioses
26 codes in this section
About Section A75-A79
Section A75-A79 (A75-A79) covers rickettsioses. It sits within the Certain infectious and parasitic diseases chapter (A00-B99). This section contains 26 ICD-10-CM codes, 21 billable diagnoses you can submit on a claim, and 5 non-billable header codes used to organize the hierarchy.
Codes are organized below by 3-character root. Click the root to see all subcodes underneath it, or click any individual code for full coverage data, payer policies, and linked CPT procedures.
Codes in A75-A79
Grouped by 3-character root code. Click any code for full detail.
| A75.0 | Epidemic louse-borne typhus fever due to Rickettsia prowazekii | Billable |
| A75.1 | Recrudescent typhus [Brill's disease] | Billable |
| A75.2 | Typhus fever due to Rickettsia typhi | Billable |
| A75.3 | Typhus fever due to Rickettsia tsutsugamushi | Billable |
| A75.9 | Typhus fever, unspecified | Billable |
| A77.0 | Spotted fever due to Rickettsia rickettsii | Billable |
| A77.1 | Spotted fever due to Rickettsia conorii | Billable |
| A77.2 | Spotted fever due to Rickettsia siberica | Billable |
| A77.3 | Spotted fever due to Rickettsia australis | Billable |
| A77.4 | Ehrlichiosis | Header |
| A77.40 | Ehrlichiosis, unspecified | Billable |
| A77.41 | Ehrlichiosis chaffeensis [E. chaffeensis] | Billable |
| A77.49 | Other ehrlichiosis | Billable |
| A77.8 | Other spotted fevers | Billable |
| A77.9 | Spotted fever, unspecified | Billable |
| A79.0 | Trench fever | Billable |
| A79.1 | Rickettsialpox due to Rickettsia akari | Billable |
| A79.8 | Other specified rickettsioses | Header |
| A79.81 | Rickettsiosis due to Ehrlichia sennetsu | Billable |
| A79.82 | Anaplasmosis [A. phagocytophilum] | Billable |
| A79.89 | Other specified rickettsioses | Billable |
| A79.9 | Rickettsiosis, unspecified | Billable |
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on July 16, 2026.
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