ICD-10-CM > M00-M99 > M20-M25 > M21 > M21.7 > M21.75 M21.75 Unequal limb length (acquired), femur Non-Billable/Non-Specific Codes M21.751Unequal limb length (acquired), right femurM21.752Unequal limb length (acquired), left femurM21.759Unequal limb length (acquired), unspecified femur