A83: Mosquito-borne viral encephalitis
Codes under A83 (Mosquito-borne viral encephalitis). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| A83.0 | Japanese encephalitis | ✓ |
| A83.0 | Japanese encephalitis | ✓ |
| A83.1 | Western equine encephalitis | ✓ |
| A83.1 | Western equine encephalitis | ✓ |
| A83.2 | Eastern equine encephalitis | ✓ |
| A83.2 | Eastern equine encephalitis | ✓ |
| A83.3 | St Louis encephalitis | ✓ |
| A83.3 | St Louis encephalitis | ✓ |
| A83.4 | Australian encephalitis | ✓ |
| A83.4 | Australian encephalitis | ✓ |
| A83.5 | California encephalitis | ✓ |
| A83.5 | California encephalitis | ✓ |
| A83.6 | Rocio virus disease | ✓ |
| A83.6 | Rocio virus disease | ✓ |
| A83.8 | Other mosquito-borne viral encephalitis | ✓ |
| A83.8 | Other mosquito-borne viral encephalitis | ✓ |
| A83.9 | Mosquito-borne viral encephalitis, unspecified | ✓ |
| A83.9 | Mosquito-borne viral encephalitis, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code A83?
A83 is an ICD-10-CM category covering Mosquito-borne viral encephalitis. It contains 18 more specific diagnosis codes, 18 of which are billable.
Is A83 a billable code?
No — A83 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 A83.0 — Japanese encephalitis). 18 of the 18 codes under A83 are billable.
What codes fall under A83?
A83 includes A83.0, A83.0, A83.1, A83.1, A83.2, plus 13 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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