ICD-10-CM A86 is the diagnosis code for Unspecified viral encephalitis. This code falls under the section "Viral and prion infections of the central nervous system" within Chapter 1 — Certain infectious and parasitic diseases (A00-B99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Understanding where A86 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, A86 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
A86 is the ICD-10-CM diagnosis code for "Unspecified viral encephalitis". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
A86 is located in Section A80-A89 — "Viral and prion infections of the central nervous system" within Chapter 1 of the ICD-10-CM Tabular List.
Use A86 when the patients documented diagnosis matches "Unspecified viral encephalitis" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Unspecified viral encephalitis is A86.
Yes, A86 can be used as a primary diagnosis code since it is billable and specific.
A86 is in Chapter 1 of the ICD-10-CM Tabular List.
Yes, A86 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.