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2025 ICD-10-CM code A84.9

Tick-borne viral encephalitis, unspecified.

Use A84.9 when the specific type of tick-borne viral encephalitis is not documented.If the type is known, use the appropriate specific code (e.g., A84.0 for Far Eastern TBE).Additional codes may be needed to reflect any complications or associated conditions.

Medical necessity is established by the signs, symptoms, and clinical findings suggestive of TBE.Confirmatory laboratory testing is ideal but not always immediately available.The diagnosis should be supported by the clinical picture and risk factors, such as tick exposure in an endemic area.

Diagnosis of TBE involves patient history, physical and neurological examination, and may include imaging (CT, EEG, MRI), spinal tap, and blood tests to confirm the presence of the virus or specific antibodies. Treatment is primarily symptomatic and supportive, ranging from rest and fluids to corticosteroids and anticonvulsants for severe cases.

In simple words: This code indicates a viral infection of the brain spread by ticks, where the specific type isn't known.

Tick-borne encephalitis (TBE) is an inflammation of the brain caused by the tick-borne encephalitis virus (TBEV).This code is used when the specific type of TBE is not documented.

Example 1: A patient presents with fever, headache, and stiff neck after a recent tick bite in a known TBE endemic area.Lab tests are ordered to confirm TBE, but the specific type is not yet determined. A84.9 is used., A patient with neurological symptoms is suspected of having TBE based on clinical findings, but further testing is required for confirmation and typing. The physician documents "tick-borne viral encephalitis, unspecified" and uses code A84.9., A patient is admitted to the hospital with seizures and altered mental status.A history of recent tick bites and exposure to potential TBE vectors leads to a presumptive diagnosis of tick-borne viral encephalitis. In the absence of definitive typing, A84.9 is appropriate.

Documentation should include evidence of tick exposure, clinical findings (e.g., fever, headache, neurological symptoms), and diagnostic test results.If specific tests identifying the type of TBE are pending or unavailable, this should be noted.

** It's important to distinguish TBE from other tick-borne illnesses with similar symptoms.A thorough evaluation is essential for accurate diagnosis and appropriate management.

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