ICD-10-CM > M00-M99 > M26-M27 > M26 > M26.2 M26.2 Anomalies of dental arch relationship Non-Billable/Non-Specific Codes M26.20Unspecified anomaly of dental arch relationshipM26.21Malocclusion, Angle's classM26.211Malocclusion, Angle's class IM26.212Malocclusion, Angle's class IIM26.213Malocclusion, Angle's class IIIM26.219Malocclusion, Angle's class, unspecifiedM26.22Open occlusal relationshipM26.220Open anterior occlusal relationshipM26.221Open posterior occlusal relationshipM26.23Excessive horizontal overlapM26.24Reverse articulationM26.25Anomalies of interarch distanceM26.29Other anomalies of dental arch relationship