A85
⚠ Non-billable
Other viral encephalitis, not elsewhere classified
ICD-10-CM · FY2026 · Certain Infectious and Parasitic Diseases
Code
A85
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Certain Infectious and Parasitic Diseases
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Official coding notes
From CMS's ICD-10-CM Tabular List.
Includes
- specified viral encephalomyelitis NEC
- specified viral meningoencephalitis NEC
Excludes1 — never code together
- 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)
Frequently asked questions
What is ICD-10 code A85?
ICD-10-CM code A85 represents Other viral encephalitis, not elsewhere classified. It is a non-billable header code requiring a more specific subcategory in the Certain Infectious and Parasitic Diseases chapter, effective October 1, 2025 – September 30, 2026.
Is A85 billable?
No. A85 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is A85 in?
A85 belongs to the Certain Infectious and Parasitic Diseases chapter (A00–B99) of ICD-10-CM.
Related codes in the A85 category
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