Non-Billable / Non-Specific Code
ICD-10-CM A83 is the diagnosis code for Mosquito-borne viral encephalitis. This code falls under the section "Viral and prion infections of the central nervous system" within Chapter 1 â Certain infectious and parasitic diseases (A00-B99). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions are not included in A83. If the patient has both, code each condition separately:
Understanding where A83 sits in the ICD-10-CM classification helps ensure proper coding:
No, A83 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
A83 is the ICD-10-CM diagnosis code for "Mosquito-borne viral encephalitis". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
A83 is located in Section A80-A89 â "Viral and prion infections of the central nervous system" within Chapter 1 of the ICD-10-CM Tabular List.
A83 has 9 sub-code(s) that provide more specific detail: A83.0, A83.1, A83.2, A83.3, A83.4 and more.
Use A83 when the patients documented diagnosis matches "Mosquito-borne 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 Mosquito-borne viral encephalitis is A83.
No, A83 is non-billable. Use a more specific sub-code for primary diagnosis billing.
A83 is in Chapter 1 of the ICD-10-CM Tabular List.
Yes, A83 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.