ICD-10-CM > M00-M99 > M20-M25 > M21 > M21.0 > M21.06 M21.06 Valgus deformity, not elsewhere classified, knee Non-Billable/Non-Specific Applicable To Genu valgumKnock knee Codes M21.061Valgus deformity, not elsewhere classified, right kneeM21.062Valgus deformity, not elsewhere classified, left kneeM21.069Valgus deformity, not elsewhere classified, unspecified knee