ICD-10-CM > M00-M99 > M20-M25 > M21 > M21.1 > M21.16 M21.16 Varus deformity, not elsewhere classified, knee Non-Billable/Non-Specific Applicable To Bow legGenu varum Codes M21.161Varus deformity, not elsewhere classified, right kneeM21.162Varus deformity, not elsewhere classified, left kneeM21.169Varus deformity, not elsewhere classified, unspecified knee