A85 – Other viral encephalitis, not elsewhere classified
ICD-10-CM 2027 diagnosis code · Viral and prion infections of the central nervous system
ICD-10-CM code
A85
- Code
A85(claims format:A85)- Description
- Other viral encephalitis, not elsewhere classified
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 1. Certain infectious and parasitic diseases (A00-B99)
- Block
- A80-A89 Viral and prion infections of the central nervous system
Billable codes under A85
A85 is a header code and cannot be used on claims. Choose the most specific code:
Notes for A85
Includes:
- specified viral encephalomyelitis NEC
- specified viral meningoencephalitis NEC
Excludes1 (not coded here):
- 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)
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
Block A80-A89
Frequently asked questions
What is ICD-10 code A85?
A85 is the ICD-10-CM code for other viral encephalitis, not elsewhere classified, in the block A80-A89 (Viral and prion infections of the central nervous system).
Is A85 a billable code?
No. A85 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.