2025 ICD-10-CM code A84.89
(Active) Effective Date: N/A Revision Date: N/A Certain infectious and parasitic diseases - Viral and prion infections of the central nervous system (A80-A89) Certain infectious and parasitic diseases (A00-B99) Feed
Other tick-borne viral encephalitis.
Medical necessity for the use of A84.89 is established by the presence of signs, symptoms, and laboratory findings confirming other tick-borne viral encephalitis.The documentation should clearly link the encephalitis to a tick-borne virus.
Clinicians diagnosing and treating patients with other tick-borne viral encephalitis are responsible for ensuring accurate documentation, appropriate testing, and reporting using this code. This includes differentiating from other central nervous system infections and considering specific tick-borne diseases like Louping ill.
- Certain infectious and parasitic diseases (A00-B99)
- Viral and prion infections of the central nervous system (A80-A89)
In simple words: This code represents other infections of the central nervous system caused by viruses transmitted by ticks, including Louping ill.
Other tick-borne viral encephalitis. This includes Louping ill.
Example 1: A patient presents with neurological symptoms after a recent tick bite in an area known for Louping ill. After appropriate investigations, the diagnosis of Louping ill is confirmed.A84.89 would be the appropriate code., A patient presents with encephalitis, and testing reveals a viral infection. A detailed history reveals a recent tick bite, and other common tick-borne encephalitis like Powassan virus is ruled out. A84.89 would be used to capture the specific tick-borne viral encephalitis., A traveler returning from a region where tick-borne encephalitis is endemic develops symptoms consistent with encephalitis. After investigations confirm a tick-borne viral illness not otherwise specified, A84.89 is applied.
Documentation for A84.89 should include details of the patient's symptoms, history of tick bites, travel history, laboratory findings confirming a viral infection, and evidence supporting a tick-borne etiology. Specific tests identifying the virus responsible are helpful.
** The code A84.89 does not specify the causative organism. Additional codes may be necessary to identify the specific virus if known.
- Payment Status: Active
- Specialties:Infectious Disease, Neurology, Internal Medicine
- Place of Service:Inpatient Hospital, Outpatient Hospital, Office