Powassan (POW) Virus Disease

Subcategory A84.8, Other tick-borne viral encephalitis, was expanded and code A84.81, Powassan virus disease, has been created to specifically identify this disease. Powassan (POW) virus disease is a tick-borne zoonosis caused by the bite of an infected tick, mostly Ixodes scapularis. Although a person who is infected may not develop symptoms immediately due to a long incubation period of one week to one month, POW virus is a serious disease that usually results in encephalitis and/or meningitis and may lead to death. Symptoms can include fever, headache, vomiting, weakness, confusion, loss of coordination, speech difficulties, and...

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Note:  The following article synopsis was NOT provided by the AHA. It was created by Find-A-Code/innoviHealth.

Article Overview

This article covers the ICD-10-CM update related to Powassan virus disease, including the expansion of a related subcategory and the addition of a specific diagnosis code. It provides broad background on the disease, its tick-borne nature, potential neurologic involvement, and why accurate identification matters for surveillance, provider awareness, and blood supply safety. The article is relevant to coders, clinicians, compliance teams, and public health professionals who track emerging infectious diseases and code set changes.

Why This Topic Matters

The update supports more precise reporting of a rare but serious tick-borne illness and helps improve monitoring of disease trends and related public health efforts.

What You Will Learn

  • How the article frames a diagnosis-specific ICD-10-CM update
  • The general clinical and epidemiologic context of Powassan virus disease
  • Why accurate identification of this disease matters for surveillance and blood safety
  • How a related ICD-10-CM subcategory was broadened to accommodate this topic

Who Should Read This

  • Medical coders
  • Coding auditors
  • Compliance professionals
  • Clinicians
  • Public health professionals
  • Health information management staff

Codes Discussed

  • ICD-10-CM: A84.81
  • ICD-10-CM: A84.89

Code Ranges Discussed

  • ICD-10-CM: A84.8

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