ICD-10-CM > M00-M99 > M20-M25 > M21 > M21.9 > M21.96 M21.96 Unspecified acquired deformity of lower leg Non-Billable/Non-Specific Codes M21.961Unspecified acquired deformity of right lower legM21.962Unspecified acquired deformity of left lower legM21.969Unspecified acquired deformity of unspecified lower leg