G56.12
BillableOther lesions of median nerve, left upper limb
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is G56.12 an HCC code?
No. G56.12 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
G56.12 is the ICD-10-CM diagnosis code for other lesions of median nerve, left upper limb. Damage or injury to the median nerve in the left arm, causing weakness, numbness, or pain in the hand and fingers. G56.12 sits in the ICD-10-CM chapter for diseases of the nervous system (g00-g99), within the section covering nerve, nerve root and plexus disorders (g50-g59).
G56.12 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Verify the specific type of median nerve lesion (compression, laceration, etc.) in the medical record for more precise coding if available.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for G56.12 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify the specific type of median nerve lesion (compression, laceration, etc.) in the medical record for more precise coding if available
- •Ensure laterality is clearly documented as left; if bilateral involvement exists, use G56.13 instead