G56.12 ICD-10-CM Code: Other lesions of median nerve, left upper limb
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FY 2026 Apr update / Diseases of the nervous system (G00-G99) / Nerve, nerve root and plexus disorders (G50-G59)
G56.12
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceOther 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.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
Code Trumping
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Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for G56.12 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for G56.12 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for G56.12 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for G56.12 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for G56.12 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for G56.12 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for G56.12 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
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.
Coder workflow notes
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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