M99.57
BillableIntervertebral disc stenosis of neural canal of upper extremity
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M99.57 an HCC code?
No. M99.57 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
M99.57 is the ICD-10-CM diagnosis code for intervertebral disc stenosis of neural canal of upper extremity. Narrowing of the spinal canal caused by a bulging disc that affects nerves going to the arms and hands, potentially causing arm pain or weakness. M99.57 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering biomechanical lesions, not elsewhere classified (m99).
M99.57 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.
Ensure documentation specifies upper extremity involvement (cervical spine typically).
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for M99.57 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Ensure documentation specifies upper extremity involvement (cervical spine typically)
- •Note which arm is affected and any associated radiculopathy symptoms