U.S. ICD-10-CM · FY 2027

B00.4 ICD-10-CM Code: Herpesviral encephalitis

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

B00.4

Herpesviral encephalitis

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where B00.4 sits

  1. 1

    Chapter 1

    Certain infectious and parasitic diseases (A00-B99)

  2. 2

    Section

    Viral infections characterized by skin and mucous membrane lesions (B00-B09)

  3. 3

    Category B00

    Herpesviral [herpes simplex] infections

  4. 4

    Code B00.4

    Herpesviral encephalitis

Documentation details

Notes for this code

Inclusion terms

  • Herpesviral meningoencephalitis
  • Simian B disease

Code first

No “code first” instruction is listed for B00.4.

Use additional code

No “use additional code” instruction is listed for B00.4.

Excludes1

Conditions that should not be reported together with this code.

  • herpesviral encephalitis due to herpesvirus 6 and 7 (B10.01, B10.09)
  • non-simplex herpesviral encephalitis (B10.0-)

Excludes2

Conditions not included here that may be reported separately when present.

No Excludes2 note is listed for B00.4.

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code B00.4 mean?

B00.4 is the FY 2027 U.S. ICD-10-CM code for “Herpesviral encephalitis.”

Is B00.4 a billable or specific ICD-10-CM code?

Yes. In the FY 2027 reference data used on this page, B00.4 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.

Where is B00.4 located in ICD-10-CM?

B00.4 is listed in Chapter 1, Certain infectious and parasitic diseases (A00-B99), within Viral infections characterized by skin and mucous membrane lesions (B00-B09) (B00–B09), under category B00, Herpesviral [herpes simplex] infections.

What coding notes are listed for B00.4?

Its listed inclusion terms are Herpesviral meningoencephalitis; Simian B disease. No code-first instruction is listed. Excludes1 notes: herpesviral encephalitis due to herpesvirus 6 and 7 (B10.01, B10.09); non-simplex herpesviral encephalitis (B10.0-). No Excludes2 note is listed.

Keep exploring

Related B00 codes

B00.0

Eczema herpeticum

B00.1

Herpesviral vesicular dermatitis

B00.2

Herpesviral gingivostomatitis and pharyngotonsillitis

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