A80-A89

Non-Billable
ChapterA00–B99
Rankblock
Official Description

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

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •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)
  • certain localized infections - see body system-related chapters
Excludes2(Not included here)
  • 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)
  • postpolio syndrome (G14)
  • sequelae of poliomyelitis (B91)
  • sequelae of viral encephalitis (B94.1)

Clinical Hierarchy

CH1Certain infectious and parasitic diseases (A00-B99)
A80-A89Viral and prion infections of the central nervous system (A80-A89)
A80Acute poliomyelitis
A81Atypical virus infections of central nervous system
A82Rabies
A83Mosquito-borne viral encephalitis
A84Tick-borne viral encephalitis
A85Other viral encephalitis, not elsewhere classified
A86Unspecified viral encephalitis
A87Viral meningitis
A88Other viral infections of central nervous system, not elsewhere classified
A89Unspecified viral infection of central nervous system

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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