ICD-10-CM > A00-B99 > A75-A79 > A77 A77 Spotted fever [tick-borne rickettsioses] Non-Billable/Non-Specific Codes A77.0Spotted fever due to Rickettsia rickettsiiA77.1Spotted fever due to Rickettsia conoriiA77.2Spotted fever due to Rickettsia sibericaA77.3Spotted fever due to Rickettsia australisA77.4EhrlichiosisA77.40Ehrlichiosis, unspecifiedA77.41Ehrlichiosis chaffeensis [E. chaffeensis]A77.49Other ehrlichiosisA77.8Other spotted feversA77.9Spotted fever, unspecified