A85

Non-Billable

ChapterA00–B99

Rankcategory

Official Description

Other viral encephalitis, not elsewhere classified

Use a more specific code (4 billable)

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