B02.21

Billable

Postherpetic geniculate ganglionitis

HCC Category Mapping

RxHCCHCC 168 — Trigeminal and Postherpetic Neuralgia

0.000

What This Code Means

Nerve pain and inflammation affecting the geniculate ganglion (a nerve cluster in the facial nerve) occurring after a shingles infection.

Coding Tips

•This is a specific postherpetic complication affecting the facial nerve pathway
•Document the timing and severity of pain to support medical necessity for treatment

Clinical Significance

Postherpetic geniculate ganglionitis is a complication of herpes zoster involving the facial nerve's geniculate ganglion, which can cause Ramsay Hunt syndrome with facial paralysis, hearing loss, and severe pain. This condition reflects ongoing nerve damage after shingles resolution and often requires prolonged pain management.

Documentation Requirements

✓History of herpes zoster affecting the ear or facial region
✓Clinical findings: facial nerve palsy, vesicles on ear/external auditory canal, hearing loss, vertigo
✓Timing: symptoms persist after resolution of the acute shingles episode
✓Pain assessment: character, severity, distribution along facial nerve pathway
✓Audiometric testing results if hearing loss is present

Commonly Confused Codes

B02.22 (Postherpetic trigeminal neuralgia) — Affects the trigeminal nerve (face sensation), not the facial nerve (motor function/hearing); different nerve pathways G51.0 (Bell palsy) — Idiopathic facial paralysis; geniculate ganglionitis has a known herpes zoster etiology with vesicles B02.29 (Other postherpetic nervous system involvement) — Use B02.21 when the geniculate ganglion is specifically affected

Code Hierarchy

└B02Zoster [herpes zoster]└B02.2Zoster with other nervous system involvement └B02.21Postherpetic geniculate ganglionitis

└B02.21Postherpetic geniculate ganglionitis