G57.90 ICD-10-CM Code: Unspecified mononeuropathy of unspecified lower limb
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FY 2026 Apr update / Diseases of the nervous system (G00-G99) / Nerve, nerve root and plexus disorders (G50-G59)
G57.90
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceUnspecified mononeuropathy of unspecified lower limb
A nerve disorder affecting an unspecified foot where the specific type of nerve damage cannot be determined, causing symptoms like pain or weakness.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for G57.90 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for G57.90 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for G57.90 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for G57.90 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for G57.90 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for G57.90 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for G57.90 in this effective period.
Buddy Documentation Tip
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is G57.90 an HCC code?
No. G57.90 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- G57.90
- Description
- Unspecified mononeuropathy of unspecified lower limb
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF
- —
- Billable
- Yes
- Payment year
- 2026
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
G57.90 is the ICD-10-CM diagnosis code for unspecified mononeuropathy of unspecified lower limb. A nerve disorder affecting an unspecified foot where the specific type of nerve damage cannot be determined, causing symptoms like pain or weakness. G57.90 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).
G57.90 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.
This is the least specific code in the G57 category; use only when the nerve involved and laterality cannot be determined.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for G57.90 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This is the least specific code in the G57 category; use only when the nerve involved and laterality cannot be determined
- •Attempt to obtain more specific information from clinical documentation to assign a more precise code