| S12121 | Other nondisplaced dens fracture |
| S12121A | Other nondisplaced dens fracture, initial encounter for closed fracture |
| S12121B | Other nondisplaced dens fracture, initial encounter for open fracture |
| S12121D | Other nondisplaced dens fracture, subsequent encounter for fracture with routine healing |
| S12121G | Other nondisplaced dens fracture, subsequent encounter for fracture with delayed healing |
| S12121K | Other nondisplaced dens fracture, subsequent encounter for fracture with nonunion |
| S12121S | Other nondisplaced dens fracture, sequela |
| S1213 | Unsp traumatic spondylolisthesis of second cervical vertebra Unspecified traumatic spondylolisthesis of second cervical vertebra |
| S12130 | Unspecified traumatic displaced spondylolisthesis of second cervical vertebra |
| S12130A | Unspecified traumatic displaced spondylolisthesis of second cervical vertebra, initial encounter for closed fracture |
| S12130B | Unspecified traumatic displaced spondylolisthesis of second cervical vertebra, initial encounter for open fracture |
| S12130D | Unspecified traumatic displaced spondylolisthesis of second cervical vertebra, subsequent encounter for fracture with routine healing |
| S12130G | Unspecified traumatic displaced spondylolisthesis of second cervical vertebra, subsequent encounter for fracture with delayed healing |
| S12130K | Unspecified traumatic displaced spondylolisthesis of second cervical vertebra, subsequent encounter for fracture with nonunion |
| S12130S | Unspecified traumatic displaced spondylolisthesis of second cervical vertebra, sequela |
| S12131 | Unspecified traumatic nondisplaced spondylolisthesis of second cervical vertebra |
| S12131A | Unspecified traumatic nondisplaced spondylolisthesis of second cervical vertebra, initial encounter for closed fracture |
| S12131B | Unspecified traumatic nondisplaced spondylolisthesis of second cervical vertebra, initial encounter for open fracture |
| S12131D | Unspecified traumatic nondisplaced spondylolisthesis of second cervical vertebra, subsequent encounter for fracture with routine healing |
| S12131G | Unspecified traumatic nondisplaced spondylolisthesis of second cervical vertebra, subsequent encounter for fracture with delayed healing |
| S12131K | Unspecified traumatic nondisplaced spondylolisthesis of second cervical vertebra, subsequent encounter for fracture with nonunion |
| S12131S | Unspecified traumatic nondisplaced spondylolisthesis of second cervical vertebra, sequela |
| S1214 | Type III traumatic spondylolisthesis of second cervical vertebra |
| S1214XA | Type III traumatic spondylolisthesis of second cervical vertebra, initial encounter for closed fracture |
| S1214XB | Type III traumatic spondylolisthesis of second cervical vertebra, initial encounter for open fracture |
| S1214XD | Type III traumatic spondylolisthesis of second cervical vertebra, subsequent encounter for fracture with routine healing |
| S1214XG | Type III traumatic spondylolisthesis of second cervical vertebra, subsequent encounter for fracture with delayed healing |
| S1214XK | Type III traumatic spondylolisthesis of second cervical vertebra, subsequent encounter for fracture with nonunion |
| S1214XS | Type III traum spondylolysis of second cervcal vert, sequela Type III traumatic spondylolisthesis of second cervical vertebra, sequela |
| S1215 | Other traumatic spondylolisthesis of second cervical vertebra |
| S12150 | Oth traumatic displ spondylolysis of second cervcal vertebra Other traumatic displaced spondylolisthesis of second cervical vertebra |
| S12150A | Other traumatic displaced spondylolisthesis of second cervical vertebra, initial encounter for closed fracture |
| S12150B | Other traumatic displaced spondylolisthesis of second cervical vertebra, initial encounter for open fracture |
| S12150D | Other traumatic displaced spondylolisthesis of second cervical vertebra, subsequent encounter for fracture with routine healing |
| S12150G | Other traumatic displaced spondylolisthesis of second cervical vertebra, subsequent encounter for fracture with delayed healing |
| S12150K | Other traumatic displaced spondylolisthesis of second cervical vertebra, subsequent encounter for fracture with nonunion |
| S12150S | Other traumatic displaced spondylolisthesis of second cervical vertebra, sequela |
| S12151 | Other traumatic nondisplaced spondylolisthesis of second cervical vertebra |
| S12151A | Oth traum nondisp spondylolysis of second cervcal vert, init Other traumatic nondisplaced spondylolisthesis of second cervical vertebra, initial encounter for closed fracture |
| S12151B | Other traumatic nondisplaced spondylolisthesis of second cervical vertebra, initial encounter for open fracture |
| S12151D | Other traumatic nondisplaced spondylolisthesis of second cervical vertebra, subsequent encounter for fracture with routine healing |
| S12151G | Other traumatic nondisplaced spondylolisthesis of second cervical vertebra, subsequent encounter for fracture with delayed healing |
| S12151K | Other traumatic nondisplaced spondylolisthesis of second cervical vertebra, subsequent encounter for fracture with nonunion |
| S12151S | Oth traum nondisp spondylolysis of second cervcal vert, sqla Other traumatic nondisplaced spondylolisthesis of second cervical vertebra, sequela |
| S1219 | Other fracture of second cervical vertebra |
| S12190 | Other displaced fracture of second cervical vertebra |
| S12190A | Other displaced fracture of second cervical vertebra, initial encounter for closed fracture |
| S12190B | Other displaced fracture of second cervical vertebra, initial encounter for open fracture |
| S12190D | Oth disp fx of second cervcal vert, subs for fx w routn heal Other displaced fracture of second cervical vertebra, subsequent encounter for fracture with routine healing |
| S12190G | Oth disp fx of second cervcal vert, subs for fx w delay heal Other displaced fracture of second cervical vertebra, subsequent encounter for fracture with delayed healing |