ICD-10 A84
Non-Billable HeaderTick-borne viral encephalitis
About ICD-10-CM A84
ICD-10-CM code A84 represents Tick-borne viral encephalitis. This is a non-billable header code in the Infectious and Parasitic Diseases chapter (block A84). The 2026 edition of ICD-10-CM A84 became effective on October 1, 2025. Non-billable codes cannot be used as a primary or secondary diagnosis on a claim, use a more specific child code instead.
Includes
- tick-borne viral meningoencephalitis
Medicare LCD Coverage for A84
Local Coverage Determinations (LCDs) from CMS MACs that list A84 as a covered diagnosis.
This doesn't mean the code isn't covered, it means no MAC has issued a Local Coverage Determination naming this specific code. Coverage may still apply under National Coverage Determinations or general medical-necessity rules.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing A84.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but A84 doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with A84
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Codes Adjacent To A84
Other codes in section A80-A89 (Viral and prion infections of the central nervous system).
ICD-10 A84, Billing FAQ
Is ICD-10 code A84 billable? +
No, A84 is a non-billable header code. Use a more specific child code from block A84 when submitting claims.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
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