G57.91 — Unspecified mononeuropathy of right lower limb
G57.91 is a billable, specific ICD-10-CM code for unspecified mononeuropathy of right lower limb. It is valid for submission on a claim.
Risk adjustment
G57.91 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
G57.91 is named in 21 Medicare coverage policies — 19 listing it as supporting medical necessity, and 2 listing it as NOT covered. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56731Billing and Coding: Nerve Blocks and Electrostimulation for Peripheral Neuropathynot covered
- A57663Billing and Coding: Nerve Blocks for Peripheral Neuropathynot covered
- A53058Billing and Coding: Home Health Physical Therapy
- A54095Billing and Coding: Nerve Conduction Studies and Electromyography
Code history
G57.91 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share G57.9. If G57.91 is not quite right, the correct code is usually one of these.
Questions about G57.91
- Is G57.91 a billable ICD-10-CM code?
- Yes. G57.91 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does G57.91 sit in the tabular list?
- Diseases of the nervous system (G00-G99), in the block Nerve, nerve root and plexus disorders (G50-G59).