| M48.51XA | Collapsed vertebra, not elsewhere classified, occipito-atlanto-axial region, initial encounter for fracture | BILLABLE CODE |
| M48.51XD | Collapsed vertebra, not elsewhere classified, occipito-atlanto-axial region, subsequent encounter for fracture with routine healing | BILLABLE CODE |
| M48.51XG | Collapsed vertebra, not elsewhere classified, occipito-atlanto-axial region, subsequent encounter for fracture with delayed healing | BILLABLE CODE |
| M48.51XS | Collapsed vertebra, not elsewhere classified, occipito-atlanto-axial region, sequela of fracture | BILLABLE CODE |
