A79: Other rickettsioses
Codes under A79 (Other rickettsioses). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| A79.0 | Trench fever | ✓ |
| A79.0 | Trench fever | ✓ |
| A79.1 | Rickettsialpox due to Rickettsia akari | ✓ |
| A79.1 | Rickettsialpox due to Rickettsia akari | ✓ |
| A79.8 | Other specified rickettsioses | — |
| A79.8 | Other specified rickettsioses | — |
| A79.9 | Rickettsiosis, unspecified | ✓ |
| A79.9 | Rickettsiosis, unspecified | ✓ |
| A79.81 | Rickettsiosis due to Ehrlichia sennetsu | ✓ |
| A79.81 | Rickettsiosis due to Ehrlichia sennetsu | ✓ |
| A79.82 | Anaplasmosis [A. phagocytophilum] | ✓ |
| A79.82 | Anaplasmosis [A. phagocytophilum] | ✓ |
| A79.89 | Other specified rickettsioses | ✓ |
| A79.89 | Other specified rickettsioses | ✓ |
Frequently asked questions
What is ICD-10-CM code A79?
A79 is an ICD-10-CM category covering Other rickettsioses. It contains 14 more specific diagnosis codes, 12 of which are billable.
Is A79 a billable code?
No — A79 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 A79.0 — Trench fever). 12 of the 14 codes under A79 are billable.
What codes fall under A79?
A79 includes A79.0, A79.0, A79.1, A79.1, A79.8, plus 9 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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