A77: Spotted fever [tick-borne rickettsioses]
Codes under A77 (Spotted fever [tick-borne rickettsioses]). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| A77.0 | Spotted fever due to Rickettsia rickettsii | ✓ |
| A77.0 | Spotted fever due to Rickettsia rickettsii | ✓ |
| A77.1 | Spotted fever due to Rickettsia conorii | ✓ |
| A77.1 | Spotted fever due to Rickettsia conorii | ✓ |
| A77.2 | Spotted fever due to Rickettsia siberica | ✓ |
| A77.2 | Spotted fever due to Rickettsia siberica | ✓ |
| A77.3 | Spotted fever due to Rickettsia australis | ✓ |
| A77.3 | Spotted fever due to Rickettsia australis | ✓ |
| A77.4 | Ehrlichiosis | — |
| A77.4 | Ehrlichiosis | — |
| A77.8 | Other spotted fevers | ✓ |
| A77.8 | Other spotted fevers | ✓ |
| A77.9 | Spotted fever, unspecified | ✓ |
| A77.9 | Spotted fever, unspecified | ✓ |
| A77.40 | Ehrlichiosis, unspecified | ✓ |
| A77.40 | Ehrlichiosis, unspecified | ✓ |
| A77.41 | Ehrlichiosis chaffeensis [E. chaffeensis] | ✓ |
| A77.41 | Ehrlichiosis chaffeensis [E. chaffeensis] | ✓ |
| A77.49 | Other ehrlichiosis | ✓ |
| A77.49 | Other ehrlichiosis | ✓ |
Frequently asked questions
What is ICD-10-CM code A77?
A77 is an ICD-10-CM category covering Spotted fever [tick-borne rickettsioses]. It contains 20 more specific diagnosis codes, 18 of which are billable.
Is A77 a billable code?
No — A77 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example A77.0 — Spotted fever due to Rickettsia rickettsii). 18 of the 20 codes under A77 are billable.
What codes fall under A77?
A77 includes A77.0, A77.0, A77.1, A77.1, A77.2, plus 15 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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