G52.9 — Cranial nerve disorder, unspecified
G52.9 is a billable, specific ICD-10-CM code for cranial nerve disorder, unspecified. It is valid for submission on a claim.
Risk adjustment
G52.9 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
G52.9 is named in 9 Medicare coverage policies — 9 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A54095Billing and Coding: Nerve Conduction Studies and Electromyography
- A56612Billing and Coding: CT of the Head
- A56619Billing and Coding: Nerve Conduction Studies and Electromyography
- A56722Billing and Coding: Intraoperative Neurophysiological Testing
How G52.9 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to G52.9.
- Compression›cranial nerve
- Disease, diseased›cranial nerve NOS
- Lesion›cranial nerve
- Paralysis, paralytic›cranial or cerebral nerve
- Atrophy, atrophic›nerve›cranial
- Disorder›nerve›cranial
- Lesion›cranial nerve›eleventh
- Paralysis, paralytic›nerve›cranial or cerebral
Related codes at this level
Codes that share G52. If G52.9 is not quite right, the correct code is usually one of these.
Questions about G52.9
- Is G52.9 a billable ICD-10-CM code?
- Yes. G52.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does G52.9 sit in the tabular list?
- Diseases of the nervous system (G00-G99), in the block Nerve, nerve root and plexus disorders (G50-G59).