A85

Classification

Category:Certain infectious and parasitic diseases

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Coding Guidance

A85 should not be used for reimbursement purposes as there are more specific codes below it that contain a greater level of detail.

Inclusion Terms

specified viral encephalomyelitis NEC
specified viral meningoencephalitis NEC

Includes

From A00-B99

diseases generally recognized as communicable or transmissible

Excludes 1

encephalitis due to cytomegalovirusB25.8
encephalitis due to herpesvirus NECB10.0
encephalitis due to herpesvirus [herpes simplex]B00.4
encephalitis due to measles virusB05.0
encephalitis due to mumps virusB26.2
encephalitis due to poliomyelitis virusA80
encephalitis due to zosterB02.0
lymphocytic choriomeningitisA87.2
myalgic encephalomyelitisG93.32

From A00-B99

certain localized infections - see body system-related chapters

Excludes 2

From A00-B99

carrier or suspected carrier of infectious diseaseZ22
infectious and parasitic diseases complicating pregnancy, childbirth and the puerperiumO98
infectious and parasitic diseases specific to the perinatal periodP35-P39
influenza and other acute respiratory infectionsJ00-J22

Use Additional Code

From A00-B99

code to identify resistance to antimicrobial drugsZ16

More Specific Codes

A85.0

Enteroviral encephalitis

A85.1

Adenoviral encephalitis

A85.2

Arthropod-borne viral encephalitis, unspecified

A85.8

Other specified viral encephalitis

External Resources

2025 ICD-10 guidelines from CMS.gov