A85.8 – Other specified viral encephalitis
ICD-10-CM 2027 diagnosis code · Viral and prion infections of the central nervous system
- Code
A85.8(claims format:A858)- Description
- Other specified viral encephalitis
- Billable
- Yes – valid for HIPAA-covered transactions
- 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
- Parent codes
- A85
Notes for A85.8
- Encephalitis lethargica
- Von Economo-Cruchet disease
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
A85 – Other viral encephalitis, not elsewhere classified
- specified viral encephalomyelitis NEC
- specified viral meningoencephalitis NEC
- 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)
Block A80-A89
Index terms for A85.8
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in A85
Frequently asked questions
What is ICD-10 code A85.8?
A85.8 is the ICD-10-CM code for other specified viral encephalitis, in the block A80-A89 (Viral and prion infections of the central nervous system).
Is A85.8 a billable code?
Yes. A85.8 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does A85.8 belong to?
It belongs to category A85 – Other viral encephalitis, not elsewhere classified.
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.