Powassan virus disease

ValidICD-10-CM diagnosis code.

Valid for claims with a date of service in the current code year.

Valid FY2021 onwards.

What has happened to this code

Every change the publisher made, from 2021 to now.

FY2021 Added to the code set Powassan virus disease

Official coding rules

Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.

Inherited from A84 Tick-borne viral encephalitis

Includes

tick-borne viral meningoencephalitis

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

Excludes1 - never coded here

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

How CDC's index refers to this code

Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.

Myelitis
Phrenitis
Cephalitis
Cerebritis
Ependymitis
Cerebellitis
Fever > brain
Ventriculitis
Febris, febrile
Meningomyelitis
Mesencephalitis
Myelomeningitis
Parencephalitis
Syringomyelitis
Fever > cerebral
Radiculomyelitis
Encephalomyelitis
Meningocerebritis
Myeloencephalitis
Encephalomeningitis
Meningoencephalitis
Meningomyeloneuritis
Encephalomeningomyelitis
Encephalomyelomeningitis
Meningoencephalomyelitis
Poliomeningoencephalitis
Fever > viral hemorrhagic
Myelopathy > in > infection
Disease, diseased > cerebral
Infection, infected, infective > brain
Disease, diseased > brain > inflammatory
Disease, diseased > cerebellar, cerebellum
Inflammation, inflamed, inflammatory > brain
Inflammation, inflamed, inflammatory > cerebral
Infection, infected, infective > spinal cord NOS
Inflammation, inflamed, inflammatory > spinal > cord
Encephalitis > Powassan
Disease, diseased > viral, virus > Powassan

Codes in the same group

Code	Description	Status
A84.89	Other tick-borne viral encephalitis	Valid