ICD-10 A84.89
Billable / Specific MCCOther tick-borne viral encephalitis
About ICD-10-CM A84.89
ICD-10-CM code A84.89 represents Other tick-borne viral encephalitis. This is a billable/specific code in the Infectious and Parasitic Diseases chapter (block A84). The 2026 edition of ICD-10-CM A84.89 became effective on October 1, 2025.
Coding Tips for A84.89
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
A84.89 is designated MCC for MS-DRG grouping. On inpatient claims, this code can shift the DRG to the with-MCC variant when documented as a present-on-admission secondary diagnosis. Hospital CDI programs flag MCC opportunities during chart review. Failure to capture this code may leave 30 to 80 percent of the inpatient stay revenue unrealized.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under A84.89. Per CMS ICD-10-CM Tabular 2026.
- Louping ill
Coding Notes
Code First
- , if applicable, transfusion related infection (T80.22-)
Inpatient DRG Impact, MCC
codes Other tick-borne viral encephalitis. As a Major Complication/Comorbidity (MCC), this can shift the DRG assignment to a higher-weighted category, substantial reimbursement impact.
Medicare LCD Coverage for A84.89
Local Coverage Determinations (LCDs) from CMS MACs that list A84.89 as a covered diagnosis.
Showing top 10 of 587 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing A84.89.
5 Medicare
CPT Codes Commonly Billed with A84.89
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 95929 CMS LCD: Billing and Coding: Neurophysiology Evoked Potentials (NEPs) CMS LCD
- 92651 CMS LCD: Billing and Coding: Neurophysiology Evoked Potentials (NEPs) CMS LCD
- 92653 CMS LCD: Billing and Coding: Neurophysiology Evoked Potentials (NEPs) CMS LCD
- 95928 CMS LCD: Billing and Coding: Neurophysiology Evoked Potentials (NEPs) CMS LCD
- 95930 CMS LCD: Billing and Coding: Neurophysiology Evoked Potentials (NEPs) CMS LCD
- 92652 CMS LCD: Billing and Coding: Neurophysiology Evoked Potentials (NEPs) CMS LCD
- 95939 CMS LCD: Billing and Coding: Neurophysiology Evoked Potentials (NEPs) CMS LCD
- 95708 CMS LCD: Billing and Coding: Special Electroencephalography CMS LCD
- 95721 CMS LCD: Billing and Coding: Special Electroencephalography CMS LCD
- 95719 CMS LCD: Billing and Coding: Special Electroencephalography CMS LCD
Codes Adjacent To A84.89
Other codes in section A80-A89 (Viral and prion infections of the central nervous system).
ICD-10 A84.89, Billing FAQ
Is ICD-10 code A84.89 billable? +
Yes, A84.89 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What other names or terms map to A84.89? +
ICD-10 A84.89 includes: Louping ill.
Is A84.89 a CC or MCC for inpatient DRG? +
Yes, this code is designated as MCC. Documenting as a secondary diagnosis on inpatient claims can shift the DRG to a higher-weighted category.
What CPT codes are commonly billed with A84.89? +
Procedures frequently paired with A84.89 include: 95929, 92651, 92653, 95928, 95930.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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