| A75 | Typhus fever |
| A75.0 | Epidemic louse-borne typhus fever due to Rickettsia prowazekii |
| A75.1 | Recrudescent typhus [Brill's disease] |
| A75.2 | Typhus fever due to Rickettsia typhi |
| A75.3 | Typhus fever due to Rickettsia tsutsugamushi |
| A75.9 | Typhus fever, unspecified |
| A77 | Spotted fever [tick-borne rickettsioses] |
| A77.0 | Spotted fever due to Rickettsia rickettsii |
| A77.1 | Spotted fever due to Rickettsia conorii |
| A77.2 | Spotted fever due to Rickettsia siberica |
| A77.3 | Spotted fever due to Rickettsia australis |
| A77.4 | Ehrlichiosis |
| A77.40 | Ehrlichiosis, unspecified |
| A77.41 | Ehrlichiosis chafeensis [E. chafeensis] |
| A77.49 | Other ehrlichiosis |
| A77.8 | Other spotted fevers |
| A77.9 | Spotted fever, unspecified |
| A78 | Q fever |
| 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 |
| A79.89 | Other specified rickettsioses |
| A79.9 | Rickettsiosis, unspecified |