ICD-10-CM > M00-M99 > M20-M25 > M21 > M21.3 M21.3 Wrist or foot drop (acquired) Non-Billable/Non-Specific Codes M21.33Wrist drop (acquired)M21.331Wrist drop, right wristM21.332Wrist drop, left wristM21.339Wrist drop, unspecified wristM21.37Foot drop (acquired)M21.371Foot drop, right footM21.372Foot drop, left footM21.379Foot drop, unspecified foot