A84.89 — Other tick-borne viral encephalitis
A84.89 is a billable, specific ICD-10-CM code for other tick-borne viral encephalitis. It is valid for submission on a claim.
Code first
The underlying condition must be sequenced before this code.
- , if applicable, transfusion related infection (T80.22-)
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Louping ill
Risk adjustment
A84.89 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
A84.89 is named in 7 Medicare coverage policies — 7 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56771Billing and Coding: Special Electroencephalography
- A56773Billing and Coding: Neurophysiology Evoked Potentials (NEPs)
- A57204Billing and Coding: MRI and CT Scans of the Head and Neck
- A58710Billing and Coding: MolDX: Molecular Syndromic Panels for Infectious Disease Pathogen Identification Testing
How A84.89 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to A84.89.
- Louping ill(encephalitis)
- Encephalitis›louping ill
- Encephalitis›viral, virus›tick-borne, specified NEC
- Encephalitis›viral, virus›arthropod-borne NEC›tick-borne›specified NEC
Related codes at this level
Codes that share A84.8. If A84.89 is not quite right, the correct code is usually one of these.
Questions about A84.89
- Is A84.89 a billable ICD-10-CM code?
- Yes. A84.89 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does A84.89 sit in the tabular list?
- Certain infectious and parasitic diseases (A00-B99), in the block Viral and prion infections of the central nervous system (A80-A89).