A85

ICD-10Non-billable category

Other viral encephalitis, not elsewhere classified

Official ICD-10-CM descriptor (FY2026)

Other viral encephalitis, not elsewhere classified

A85 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.

Includes

specified viral encephalomyelitis NEC
specified viral meningoencephalitis NEC

Excludes1

Not coded here. An Excludes1 code should never be reported at the same time as the code above it.

encephalitis due to cytomegalovirus (B25.8)
encephalitis due to herpesvirus NEC (B10.0-)
encephalitis due to herpesvirus [herpes simplex] (B00.4)
encephalitis due to measles virus (B05.0)
encephalitis due to mumps virus (B26.2)
encephalitis due to poliomyelitis virus (A80.-)
encephalitis due to zoster (B02.0)
lymphocytic choriomeningitis (A87.2)
myalgic encephalomyelitis (G93.32)

More specific codes under A85

Where this code sits

Chapter: 1. Certain infectious and parasitic diseases (A00-B99)
Block: Viral and prion infections of the central nervous system (A80-A89)

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.