A84: Tick-borne viral encephalitis
Codes under A84 (Tick-borne viral encephalitis). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| A84.0 | Far Eastern tick-borne encephalitis [Russian spring-summer encephalitis] | ✓ |
| A84.0 | Far Eastern tick-borne encephalitis [Russian spring-summer encephalitis] | ✓ |
| A84.1 | Central European tick-borne encephalitis | ✓ |
| A84.1 | Central European tick-borne encephalitis | ✓ |
| A84.8 | Other tick-borne viral encephalitis | — |
| A84.8 | Other tick-borne viral encephalitis | — |
| A84.9 | Tick-borne viral encephalitis, unspecified | ✓ |
| A84.9 | Tick-borne viral encephalitis, unspecified | ✓ |
| A84.81 | Powassan virus disease | ✓ |
| A84.81 | Powassan virus disease | ✓ |
| A84.89 | Other tick-borne viral encephalitis | ✓ |
| A84.89 | Other tick-borne viral encephalitis | ✓ |
Frequently asked questions
What is ICD-10-CM code A84?
A84 is an ICD-10-CM category covering Tick-borne viral encephalitis. It contains 12 more specific diagnosis codes, 10 of which are billable.
Is A84 a billable code?
No — A84 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 A84.0 — Far Eastern tick-borne encephalitis [Russian spring-summer encephalitis]). 10 of the 12 codes under A84 are billable.
What codes fall under A84?
A84 includes A84.0, A84.0, A84.1, A84.1, A84.8, plus 7 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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