ICD-10-CM > G00-G99 > G50-G59 > G57 > G57.9 G57.9 Unspecified mononeuropathy of lower limb Non-Billable/Non-Specific Codes G57.90Unspecified mononeuropathy of unspecified lower limbG57.91Unspecified mononeuropathy of right lower limbG57.92Unspecified mononeuropathy of left lower limbG57.93Unspecified mononeuropathy of bilateral lower limbs