ICD-10-CM diagnosis code
B02.21 Postherpetic geniculate ganglionitis
- Billable
- Yes, a complete code (FY2026)
- Category
- B02 Zoster [herpes zoster]
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Other codes in B02
16 complete codes in this category.
- B02.0Zoster encephalitis
- B02.1Zoster meningitis
- B02.21Postherpetic geniculate ganglionitis
- B02.22Postherpetic trigeminal neuralgia
- B02.23Postherpetic polyneuropathy
- B02.24Postherpetic myelitis
- B02.29Other postherpetic nervous system involvement
- B02.30Zoster ocular disease, unspecified
- B02.31Zoster conjunctivitis
- B02.32Zoster iridocyclitis
- B02.33Zoster keratitis
- B02.34Zoster scleritis
Documentation tips
- Make sure the note supports every element of the title, “Postherpetic geniculate ganglionitis”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to B02.
The international WHO ICD-10 also has B02, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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