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A83Non-billableSave

A83 - Mosquito-borne viral encephalitis

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

A83 is a non-billable heading. Report one of the 9 more specific codes below.

Includes, Excludes and Coding Notes

IncludesFrom A83

Conditions this code covers.

  • mosquito-borne viral meningoencephalitis
Excludes 2 — Not Included HereFrom A83

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

  • Venezuelan equine encephalitis (A92.2)
  • West Nile fever (A92.3-)
  • West Nile virus (A92.3-)
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 (9)

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→