FY2027
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Excludes1 pair

B00.4 vs B10-

B00.4 and B10 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.

The official note, declared on B00.4
non-simplex herpesviral encephalitis (B10.0-)
B00.4

Herpesviral encephalitis

Billable
Chapter 1
Certain infectious and parasitic diseases
Section
B00-B09
Use when the record says
  • Herpesviral meningoencephalitis
  • Simian B disease
Indexed under
  • Disease, diseased › simian B
  • Encephalitis › herpesviral
  • Herpes, herpesvirus, herpetic › encephalitis
  • Meningoencephalitis › herpesviral, herpetic
  • Encephalitis › in › herpes virus (simplex)
B10

Other human herpesviruses

Not billable
Chapter 1
Certain infectious and parasitic diseases
Section
B10

Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027