ICD-10-CM > M00-M99 > M20-M25 > M21 > M21.1 > M21.12 M21.12 Varus deformity, not elsewhere classified, elbow Non-Billable/Non-Specific Applicable To Cubitus varus, elbow Codes M21.121Varus deformity, not elsewhere classified, right elbowM21.122Varus deformity, not elsewhere classified, left elbowM21.129Varus deformity, not elsewhere classified, unspecified elbow