B00.4 vs B10.0
B00.4 (Herpesviral encephalitis) compared with B10.0 (Other human herpesvirus encephalitis), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. B00.4 carries an Excludes1 note covering B10.0: “non-simplex herpesviral encephalitis (B10.0-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Yes, when both are documented. B10.0 carries an Excludes2 note covering B00.4: “herpes encephalitis NOS (B00.4)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Yes, when both are documented. B10.0 carries an Excludes2 note covering B00.4: “herpes simplex encephalitis (B00.4)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Yes, when both are documented. B10.0 carries an Excludes2 note covering B00.4: “human herpesvirus encephalitis (B00.4)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Yes, when both are documented. B10.0 carries an Excludes2 note covering B00.4: “simian B herpes virus encephalitis (B00.4)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Yes, when both are documented. B10.0 carries an Excludes2 note covering B00.4: “herpes simplex (B00.-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Yes, when both are documented. B10.0 carries an Excludes2 note covering B00.4: “human herpesvirus NOS (B00.-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Yes, when both are documented. B10.0 carries an Excludes2 note covering B00.4: “human herpesvirus 1 and 2 (B00.-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| B00.4Herpesviral encephalitis | B10.0Other human herpesvirus encephalitis | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) |
| Definition | Herpesviral encephalitis is a billable ICD-10-CM diagnosis code (B00.4). | Other human herpesvirus encephalitis is a non-billable ICD-10-CM category code (B10.0). |
| Includes | Herpesviral meningoencephalitis Simian B disease | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources