ICD-10-CM > M00-M99 > M20-M25 > M21 > M21.7 > M21.76 M21.76 Unequal limb length (acquired), tibia and fibula Non-Billable/Non-Specific Codes M21.761Unequal limb length (acquired), right tibiaM21.762Unequal limb length (acquired), left tibiaM21.763Unequal limb length (acquired), right fibulaM21.764Unequal limb length (acquired), left fibulaM21.769Unequal limb length (acquired), unspecified tibia and fibula