ICD-10-CM A85: Other viral encephalitis, not elsewhere classified

ICD-10-CM Diagnosis Code (2025)

Official Description for A85

Other viral encephalitis, not elsewhere classified

Coding Notes & Guidelines for A85

Includes Notes
  • 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)
Excludes1: Not Coded Here

West nile virus with encephalitis (A92.31)

Inclusion Terms

Enteroviral encephalomyelitis

Inclusion Terms

Adenoviral meningoencephalitis

Inclusion Terms
  • Encephalitis lethargica
  • Von Economo-Cruchet disease

Child Codes (More Specific Codes for A85):

A85.0 - Enteroviral encephalitis A85.1 - Adenoviral encephalitis A85.2 - Arthropod-borne viral encephalitis, unspecified A85.8 - Other specified viral encephalitis

About ICD-10-CM Code A85 (Other viral encephalitis)

ICD-10-CM code A85 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM A85 became effective on October 1, 2024.

This page provides detailed information about A85 - Other viral encephalitis, not elsewhere classified. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Other viral encephalitis related to not elsewhere classified.