R94.138
BillableAbnormal results of other function studies of peripheral nervous system
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is R94.138 an HCC code?
No. R94.138 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
R94.138 is the ICD-10-CM diagnosis code for abnormal results of other function studies of peripheral nervous system. Nerve function tests (other than EMG) that show abnormal results, such as nerve conduction studies. R94.138 sits in the ICD-10-CM chapter for symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (r00-r99), within the section covering abnormal findings on diagnostic imaging and in function studies, without diagnosis (r90-r94).
R94.138 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 includes abnormal nerve conduction velocity studies and other peripheral nervous system function tests.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for R94.138 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This includes abnormal nerve conduction velocity studies and other peripheral nervous system function tests
- •Specify which nerves were tested and which extremities were affected in documentation