ICD-10-CM > M00-M99 > M20-M25 > M21 > M21.7 > M21.72 M21.72 Unequal limb length (acquired), humerus Non-Billable/Non-Specific Codes M21.721Unequal limb length (acquired), right humerusM21.722Unequal limb length (acquired), left humerusM21.729Unequal limb length (acquired), unspecified humerus