| A77 | Spotted fever [tick-borne rickettsioses] | NON-BILLABLE CODE |
| A77.0 | Spotted fever due to Rickettsia rickettsii | BILLABLE CODE |
| A77.1 | Spotted fever due to Rickettsia conorii | BILLABLE CODE |
| A77.2 | Spotted fever due to Rickettsia siberica | BILLABLE CODE |
| A77.3 | Spotted fever due to Rickettsia australis | BILLABLE CODE |
| A77.4 | Ehrlichiosis | NON-BILLABLE CODE |
| A77.40 | Ehrlichiosis, unspecified | BILLABLE CODE |
| A77.41 | Ehrlichiosis chafeensis [E. chafeensis] | BILLABLE CODE |
| A77.49 | Other ehrlichiosis | BILLABLE CODE |
| A77.9 | Spotted fever, unspecified | BILLABLE CODE |
