| M26.20 | Unspecified anomaly of dental arch relationship | BILLABLE CODE |
| M26.21 | Malocclusion, Angle's class | NON-BILLABLE CODE |
| M26.211 | Malocclusion, Angle's class I | BILLABLE CODE |
| M26.212 | Malocclusion, Angle's class II | BILLABLE CODE |
| M26.213 | Malocclusion, Angle's class III | BILLABLE CODE |
| M26.219 | Malocclusion, Angle's class, unspecified | BILLABLE CODE |
| M26.22 | Open occlusal relationship | NON-BILLABLE CODE |
| M26.220 | Open anterior occlusal relationship | BILLABLE CODE |
| M26.221 | Open posterior occlusal relationship | BILLABLE CODE |
| M26.23 | Excessive horizontal overlap | BILLABLE CODE |
| M26.24 | Reverse articulation | BILLABLE CODE |
| M26.25 | Anomalies of interarch distance | BILLABLE CODE |
| M26.29 | Other anomalies of dental arch relationship | BILLABLE CODE |
