ICD-10-CM > G00-G99 > G50-G59 > G56 > G56.9 G56.9 Unspecified mononeuropathy of upper limb Non-Billable/Non-Specific Codes G56.90Unspecified mononeuropathy of unspecified upper limbG56.91Unspecified mononeuropathy of right upper limbG56.92Unspecified mononeuropathy of left upper limbG56.93Unspecified mononeuropathy of bilateral upper limbs