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B10.09

B10.09: Other human herpesvirus encephalitis

Billable / specific codeICD-10-CM

B10.09 is a billable, specific ICD-10-CM code for other human herpesvirus encephalitis. It is valid for submission on a claim.

Check B10.09 with the rest of the claim: free scrubber

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

  • Human herpesvirus 7 encephalitis

Excludes2 inherited from the categories above B10.09

Not part of this code, but both may be coded when both are present.

Written on B10.0: Other human herpesvirus encephalitis

  • herpes encephalitis NOS (B00.4)
  • herpes simplex encephalitis (B00.4)
  • human herpesvirus encephalitis (B00.4)
  • simian B herpes virus encephalitis (B00.4)

Written on B10: Other human herpesviruses

  • cytomegalovirus (B25.9)
  • Epstein-Barr virus (B27.0-)
  • herpes NOS (B00.9)
  • herpes simplex (B00.-)
  • herpes zoster (B02.-)
  • human herpesvirus NOS (B00.-)
  • human herpesvirus 1 and 2 (B00.-)
  • human herpesvirus 3 (B01.-, B02.-)
  • human herpesvirus 4 (B27.0-)
  • human herpesvirus 5 (B25.-)
  • varicella (B01.-)
  • zoster (B02.-)

Other codes that can never be billed with B10.09

Their own Excludes1 notes name this code, so the conflict is not listed above.

  • B00.4Herpesviral encephalitis

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

B10.09 is named in 2 Medicare coverage policies: 2 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

  • A56771Billing and Coding: Special Electroencephalography
  • A57204Billing and Coding: MRI and CT Scans of the Head and Neck

Alphabetic index entries that lead here

  • Encephalitis›herpesviral›due to herpesvirus 7
  • Encephalitis›herpesviral›specified NEC
  • Herpes, herpesvirus, herpetic›encephalitis›due to herpesvirus 7
  • Herpes, herpesvirus, herpetic›encephalitis›specified NEC
  • Meningoencephalitis›herpesviral, herpetic›due to herpesvirus 7
  • Meningoencephalitis›herpesviral, herpetic›specified NEC
  • Encephalitis›in›herpes virus›due to herpesvirus 7
  • Encephalitis›in›herpes virus›specified NEC
  • Herpes, herpesvirus, herpetic›human›7›encephalitis
  • Meningoencephalitis›in›herpes›due to herpesvirus 7
  • Meningoencephalitis›in›herpes›specified NEC

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under B10.0

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.