Powassan virus disease
ICD-10 A84.81 is a billable code used to indicate a diagnosis of powassan virus disease.
Powassan virus disease is a rare but serious viral infection transmitted by ticks, primarily the Ixodes scapularis (black-legged tick) and Ixodes pacificus (western black-legged tick). The disease can lead to severe neurological complications, including encephalitis and meningitis, which may result in long-term neurological sequelae. Symptoms typically manifest within one to four weeks after a tick bite and may include fever, headache, vomiting, weakness, confusion, and seizures. In severe cases, patients may experience altered mental status and focal neurological deficits. Diagnosis is primarily based on clinical presentation and serological testing for Powassan virus-specific IgM antibodies. There is currently no specific antiviral treatment for Powassan virus disease, and management is largely supportive. Vaccination against Powassan virus is not available, making prevention through tick avoidance strategies crucial. Given the potential for severe outcomes, timely recognition and coding of this condition are essential for appropriate patient management and resource allocation.
Detailed history of tick exposure, clinical symptoms, and laboratory test results.
Patients presenting with fever and neurological symptoms after recent outdoor activities in endemic areas.
Ensure documentation includes serological test results and any differential diagnoses considered.
Comprehensive neurological examination findings, imaging studies, and follow-up assessments.
Patients with acute encephalitis or meningitis symptoms with a history of tick exposure.
Document any long-term neurological sequelae for accurate coding of complications.
Used to confirm Powassan virus infection in patients presenting with neurological symptoms.
Document the reason for testing and any relevant clinical findings.
Infectious disease specialists should ensure comprehensive documentation of test results.
Common symptoms include fever, headache, vomiting, weakness, confusion, and in severe cases, seizures and altered mental status.
Currently, there is no vaccine available for Powassan virus, making prevention through tick avoidance essential.
