A84.9

Tick-borne viral encephalitis, unspecified

Billable / specific

A84.9 is a billable, specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes in FY2027.

Inclusion terms

Includes (from A84)

  • diseases generally recognized as communicable or transmissible
  • tick-borne viral meningoencephalitis

Excludes1

Not coded here — never report together with this code.

  • postpolio syndrome (G14) (from A84)
  • sequelae of poliomyelitis (B91) (from A84)
  • sequelae of viral encephalitis (B94.1) (from A84)

Excludes2

Not included here — may be reported together when both conditions exist.

  • carrier or suspected carrier of infectious disease (Z22.-) (from A84)
  • certain localized infections - see body system-related chapters (from A84)
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-) (from A84)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39) (from A84)
  • influenza and other acute respiratory infections (J00-J22) (from A84)

Use additional code

Add a code to identify the following, if applicable.

  • code to identify resistance to antimicrobial drugs (Z16.-) (from A84)

Also known as

  • Encephalitis, tick-borne
  • Encephalitis, viral, virus, arthropod-borne NEC, tick-borne
  • Infection, infected, infective, virus, viral NOS, encephalitis, tick-borne

Parent code

  • A84Tick-borne viral encephalitisHeader

Related codes

  • A84.0Far Eastern tick-borne encephalitis [Russian spring-summer encephalitis]Billable
  • A84.1Central European tick-borne encephalitisBillable
  • A84.8Other tick-borne viral encephalitisHeader

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