ICD-10-CM B00.4 is the diagnosis code for Herpesviral encephalitis. This code falls under the section "Viral infections characterized by skin and mucous membrane lesions" 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.
The following conditions should never be coded at the same time as B00.4. They are mutually exclusive:
Understanding where B00.4 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, B00.4 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
B00.4 is the ICD-10-CM diagnosis code for "Herpesviral encephalitis". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of B00.4 is B00 ("Herpesviral [herpes simplex] infections"). B00.4 provides a more specific classification within this category.
B00.4 is located in Section B00-B09 — "Viral infections characterized by skin and mucous membrane lesions" within Chapter 1 of the ICD-10-CM Tabular List.
Use B00.4 when the patients documented diagnosis matches "Herpesviral 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 Herpesviral encephalitis is B00.4.
Yes, B00.4 can be used as a primary diagnosis code since it is billable and specific.
B00.4 is in Chapter 1 of the ICD-10-CM Tabular List.
Type 1 Excludes for B00.4 include: herpesviral encephalitis due to herpesvirus 6 and 7 (B10.01, B10.09); non-simplex herpesviral encephalitis (B10.0-).
Yes, B00.4 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.