| S12.000 | Unspecified displaced fracture of first cervical vertebra | NON-BILLABLE CODE |
| S12.000A | Unspecified displaced fracture of first cervical vertebra, initial encounter for closed fracture | BILLABLE CODE |
| S12.000B | Unspecified displaced fracture of first cervical vertebra, initial encounter for open fracture | BILLABLE CODE |
| S12.000D | Unspecified displaced fracture of first cervical vertebra, subsequent encounter for fracture with routine healing | BILLABLE CODE |
| S12.000G | Unspecified displaced fracture of first cervical vertebra, subsequent encounter for fracture with delayed healing | BILLABLE CODE |
| S12.000K | Unspecified displaced fracture of first cervical vertebra, subsequent encounter for fracture with nonunion | BILLABLE CODE |
| S12.000S | Unspecified displaced fracture of first cervical vertebra, sequela | BILLABLE CODE |
| S12.001 | Unspecified nondisplaced fracture of first cervical vertebra | NON-BILLABLE CODE |
| S12.001A | Unspecified nondisplaced fracture of first cervical vertebra, initial encounter for closed fracture | BILLABLE CODE |
| S12.001B | Unspecified nondisplaced fracture of first cervical vertebra, initial encounter for open fracture | BILLABLE CODE |
| S12.001D | Unspecified nondisplaced fracture of first cervical vertebra, subsequent encounter for fracture with routine healing | BILLABLE CODE |
| S12.001G | Unspecified nondisplaced fracture of first cervical vertebra, subsequent encounter for fracture with delayed healing | BILLABLE CODE |
| S12.001K | Unspecified nondisplaced fracture of first cervical vertebra, subsequent encounter for fracture with nonunion | BILLABLE CODE |
| S12.001S | Unspecified nondisplaced fracture of first cervical vertebra, sequela | BILLABLE CODE |
