ICD-10-CM > M00-M99 > M20-M25 > M21 > M21.7 > M21.73 M21.73 Unequal limb length (acquired), ulna and radius Non-Billable/Non-Specific Codes M21.731Unequal limb length (acquired), right ulnaM21.732Unequal limb length (acquired), left ulnaM21.733Unequal limb length (acquired), right radiusM21.734Unequal limb length (acquired), left radiusM21.739Unequal limb length (acquired), unspecified ulna and radius