All ICD10 Codes

A85

Non-Billable
ChapterA00–B99
Rankcategory
Description

Other viral encephalitis, not elsewhere classified

About ICD-10-CM code A85

Other viral encephalitis, not elsewhere classified is classified in ICD-10-CM as code A85, part of A00-B99 Certain Infectious and Parasitic Diseases, within Viral and prion infections of the central nervous system (A80-A89). Its status is non-billable, meaning reporting it requires a deeper, more specific code.

Use a more specific code (4 billable)
A85.0Enteroviral encephalitisA85.1Adenoviral encephalitisA85.2Arthropod-borne viral encephalitis, unspecifiedA85.8Other specified viral encephalitis
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99).

CH1 Parent Instructions

Includes
  • diseases generally recognized as communicable or transmissible
Excludes1(Not coded here. Use a different code.)
  • certain localized infections - see body system-related chapters
Excludes2(Not included here. Code separately if applicable.)
  • carrier or suspected carrier of infectious disease (Z22.-)
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)
Use Additional Code
  • code to identify resistance to antimicrobial drugs (Z16.-)

A80-A89 Parent Instructions

Excludes1(Not coded here. Use a different code.)
  • postpolio syndrome (G14)
  • sequelae of poliomyelitis (B91)
  • sequelae of viral encephalitis (B94.1)

Instructional Notes

Includes
  • specified viral encephalomyelitis NEC
  • specified viral meningoencephalitis NEC
Excludes1(Not coded here. Use a different 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)

Clinical Hierarchy

BillableHas subcodes
CH1Certain infectious and parasitic diseases (A00-B99)
A80-A89Viral and prion infections of the central nervous system (A80-A89)
A85Other viral encephalitis, not elsewhere classifiedNot billable
A85.0Enteroviral encephalitisBillable
A85.1Adenoviral encephalitisBillable
A85.2Arthropod-borne viral encephalitis, unspecifiedBillable
A85.8Other specified viral encephalitisBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to A85:

blockA80-A89
Viral and prion infections of the central nervous system (A80-A89)
View context instructions
chapterCH1
Certain infectious and parasitic diseases (A00-B99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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