A85 ICD-10-CM Code: Other viral encephalitis, not elsewhere classified
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Official description
A85Other viral encephalitis, not elsewhere classified
ICD-10-CM diagnosis code · United States clinical modification
Where A85 sits
- 1
Chapter 1
Certain infectious and parasitic diseases (A00-B99)
- 2
Section
Viral and prion infections of the central nervous system (A80-A89)
- 3
Category A85
Other viral encephalitis, not elsewhere classified
- 4
Code A85
Other viral encephalitis, not elsewhere classified
Codes under A85
A85 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Notes for this code
Inclusion terms
No inclusion terms are listed for A85.
Code first
No “code first” instruction is listed for A85.
Use additional code
No “use additional code” instruction is listed for A85.
Excludes1
Conditions that should not be reported together with this code.
- 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)
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for A85.
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code A85 mean?
A85 is the FY 2027 U.S. ICD-10-CM code for “Other viral encephalitis, not elsewhere classified.”
Is A85 a billable or specific ICD-10-CM code?
No. A85 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is A85 located in ICD-10-CM?
A85 is listed in Chapter 1, Certain infectious and parasitic diseases (A00-B99), within Viral and prion infections of the central nervous system (A80-A89) (A80–A89), under category A85, Other viral encephalitis, not elsewhere classified.
What coding notes are listed for A85?
No inclusion terms are listed for A85 in this reference record. No code-first instruction is listed. Excludes1 notes: 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). No Excludes2 note is listed.