ICD-10-CM 2027 · A80-A89

Viral and prion infections of the central nervous system

Part of chapter 1, certain infectious and parasitic diseases.

About A80-A89

Block A80-A89 contains 10 categories and 48 billable codes for FY2027. No codes here changed in the FY2027 update. 20 codes are MCCs and 25 are CCs when reported as secondary diagnoses.

A80Acute poliomyelitis

A80.0Acute paralytic poliomyelitis, vaccine-associated
A80.1Acute paralytic poliomyelitis, wild virus, imported
A80.2Acute paralytic poliomyelitis, wild virus, indigenous
A80.3Acute paralytic poliomyelitis, other and unspecified
A80.4Acute nonparalytic poliomyelitis
A80.9Acute poliomyelitis, unspecified

A81Atypical virus infections of central nervous system

A81.0Creutzfeldt-Jakob disease
A81.1Subacute sclerosing panencephalitis
A81.2Progressive multifocal leukoencephalopathy
A81.8Other atypical virus infections of central nervous system
A81.9Atypical virus infection of central nervous system, unspecified

A82Rabies

A82.0Sylvatic rabies
A82.1Urban rabies
A82.9Rabies, unspecified

A83Mosquito-borne viral encephalitis

A83.0Japanese encephalitis
A83.1Western equine encephalitis
A83.2Eastern equine encephalitis
A83.3St Louis encephalitis
A83.4Australian encephalitis
A83.5California encephalitis
A83.6Rocio virus disease
A83.8Other mosquito-borne viral encephalitis
A83.9Mosquito-borne viral encephalitis, unspecified

A84Tick-borne viral encephalitis

A84.0Far Eastern tick-borne encephalitis [Russian spring-summer encephalitis]
A84.1Central European tick-borne encephalitis
A84.8Other tick-borne viral encephalitis
A84.9Tick-borne viral encephalitis, unspecified

A85Other viral encephalitis, not elsewhere classified

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

A86Unspecified viral encephalitis

A87Viral meningitis

A87.0Enteroviral meningitis
A87.1Adenoviral meningitis
A87.2Lymphocytic choriomeningitis
A87.8Other viral meningitis
A87.9Viral meningitis, unspecified

A88Other viral infections of central nervous system, not elsewhere classified

A88.0Enteroviral exanthematous fever [Boston exanthem]
A88.1Epidemic vertigo
A88.8Other specified viral infections of central nervous system

A89Unspecified viral infection of central nervous system

Block notes

Excludes1

postpolio syndrome (G14)
sequelae of poliomyelitis (B91)
sequelae of viral encephalitis (B94.1)