All ICD10 Codes

A80-A89

Non-Billable
ChapterA00–B99
Rankblock
Official Description

Viral and prion infections of the central nervous system (A80-A89)

Use a more specific code (2 billable, 8 non-billable)
A80Acute poliomyelitishas subcodesA81Atypical virus infections of central nervous systemhas subcodesA82Rabieshas subcodesA83Mosquito-borne viral encephalitishas subcodesA84Tick-borne viral encephalitishas subcodesA85Other viral encephalitis, not elsewhere classifiedhas subcodesA86Unspecified viral encephalitisA87Viral meningitishas subcodesA88Other viral infections of central nervous system, not elsewhere classifiedhas subcodesA89Unspecified viral infection of central nervous system
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.-)

Instructional Notes

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

Clinical Hierarchy

BillableHas subcodes
CH1Certain infectious and parasitic diseases (A00-B99)
A80-A89Viral and prion infections of the central nervous system (A80-A89)Not billable
A80Acute poliomyelitisSubcodes
A81Atypical virus infections of central nervous systemSubcodes
A82RabiesSubcodes
A83Mosquito-borne viral encephalitisSubcodes
A84Tick-borne viral encephalitisSubcodes
A85Other viral encephalitis, not elsewhere classifiedSubcodes
A86Unspecified viral encephalitisBillable
A87Viral meningitisSubcodes
A88Other viral infections of central nervous system, not elsewhere classifiedSubcodes
A89Unspecified viral infection of central nervous systemBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to A80-A89:

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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