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A81Non-billableSave

A81 - Atypical virus infections of central nervous system

ICD-10-CM Chapter 1: Certain infectious and parasitic diseases · A80-A89 Viral and prion infections of the central nervous system (A80-A89) · Top-level category · FY2027

Coding Guidance

A81 is a non-billable heading. Report one of the 5 more specific codes below.

Includes, Excludes and Coding Notes

IncludesFrom A81

Conditions this code covers.

  • diseases of the central nervous system caused by prions
Use Additional CodeFrom A81

Add a secondary code to identify the associated condition or cause when it is documented.

  • code, if applicable, to identify:
  • dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4)
  • dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-)
  • dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3)
  • dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2)
  • dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0)
  • mild neurocognitive disorder due to known physiological condition (F06.7-)
Excludes 1 — Not Coded HereFrom A80-A89 Viral and prion infections of the central nervous system (A80-A89)

Mutually exclusive: these conditions are never reported together with this code.

  • postpolio syndrome (G14)
  • sequelae of poliomyelitis (B91)
  • sequelae of viral encephalitis (B94.1)
IncludesFrom Chapter A00-B99

Conditions this code covers.

  • diseases generally recognized as communicable or transmissible
Excludes 2 — Not Included HereFrom Chapter A00-B99

Not part of this code; report both codes when the patient has both conditions.

  • carrier or suspected carrier of infectious disease (Z22.-)
  • certain localized infections - see body system-related chapters
  • 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 CodeFrom Chapter A00-B99

Add a secondary code to identify the associated condition or cause when it is documented.

  • code to identify resistance to antimicrobial drugs (Z16.-)

More Specific Codes (5)

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→