A85.2
Billable codeArthropod-borne viral encephalitis, unspecified
The ICD-10 code for arthropod-borne viral encephalitis, unspecified is A85.2.
Clinical notes
Excludes1 (not coded here)
An Excludes1 note is a pure exclusion: the excluded condition and this code should never be reported together, because the two conditions cannot occur at the same time (e.g. a congenital form vs. an acquired form of the same disease).
- West nile virus with encephalitis (A92.31)
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This code describes an unspecified presentation. If the medical record documents a more specific detail (e.g. laterality, type, or affected site), a more specific sibling code should be used instead — see Related codes below.
- •Confirm the excluded condition(s) listed above are not also present — Excludes1 conditions cannot be coded together with this one.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- A85.0Enteroviral encephalitis
- A85.1Adenoviral encephalitis
- A85.8Other specified viral encephalitis
- A85.2Arthropod-borne viral encephalitis, unspecified
ICD-9-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.
- 064
Associated MS-DRGs
A85.2 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.
Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.
- DRG 023Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator
- DRG 024Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis without MCC
- DRG 097Non-Bacterial Infection of Nervous System Except Viral Meningitis with MCC
- DRG 098Non-Bacterial Infection of Nervous System Except Viral Meningitis with CC
- DRG 099Non-Bacterial Infection of Nervous System Except Viral Meningitis without CC/MCC