Non-Billable / Non-Specific Code
ICD-10-CM A85 is the diagnosis code for Other viral encephalitis, not elsewhere classified. 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 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 should never be coded at the same time as A85. They are mutually exclusive:
Understanding where A85 sits in the ICD-10-CM classification helps ensure proper coding:
No, A85 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
A85 is the ICD-10-CM diagnosis code for "Other viral encephalitis, not elsewhere classified". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
A85 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.
A85 has 4 sub-code(s) that provide more specific detail: A85.0, A85.1, A85.2, A85.8.
Use A85 when the patients documented diagnosis matches "Other viral encephalitis, not elsewhere classified" 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 Other viral encephalitis, not elsewhere classified is A85.
No, A85 is non-billable. Use a more specific sub-code for primary diagnosis billing.
A85 is in Chapter 1 of the ICD-10-CM Tabular List.
Type 1 Excludes for A85 include: encephalitis due to cytomegalovirus (B25.8); encephalitis due to herpesvirus NEC (B10.0-); encephalitis due to herpesvirus [herpes simplex] (B00.4) and more.
Yes, A85 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.