| S83.121 | Posterior subluxation of proximal end of tibia, right knee | NON-BILLABLE CODE |
| S83.121A | Posterior subluxation of proximal end of tibia, right knee, initial encounter | BILLABLE CODE |
| S83.121D | Posterior subluxation of proximal end of tibia, right knee, subsequent encounter | BILLABLE CODE |
| S83.121S | Posterior subluxation of proximal end of tibia, right knee, sequela | BILLABLE CODE |
| S83.122 | Posterior subluxation of proximal end of tibia, left knee | NON-BILLABLE CODE |
| S83.122A | Posterior subluxation of proximal end of tibia, left knee, initial encounter | BILLABLE CODE |
| S83.122D | Posterior subluxation of proximal end of tibia, left knee, subsequent encounter | BILLABLE CODE |
| S83.122S | Posterior subluxation of proximal end of tibia, left knee, sequela | BILLABLE CODE |
| S83.123 | Posterior subluxation of proximal end of tibia, unspecified knee | NON-BILLABLE CODE |
| S83.123A | Posterior subluxation of proximal end of tibia, unspecified knee, initial encounter | BILLABLE CODE |
| S83.123D | Posterior subluxation of proximal end of tibia, unspecified knee, subsequent encounter | BILLABLE CODE |
| S83.123S | Posterior subluxation of proximal end of tibia, unspecified knee, sequela | BILLABLE CODE |
| S83.124 | Posterior dislocation of proximal end of tibia, right knee | NON-BILLABLE CODE |
| S83.124A | Posterior dislocation of proximal end of tibia, right knee, initial encounter | BILLABLE CODE |
| S83.124D | Posterior dislocation of proximal end of tibia, right knee, subsequent encounter | BILLABLE CODE |
| S83.124S | Posterior dislocation of proximal end of tibia, right knee, sequela | BILLABLE CODE |
| S83.125 | Posterior dislocation of proximal end of tibia, left knee | NON-BILLABLE CODE |
| S83.125A | Posterior dislocation of proximal end of tibia, left knee, initial encounter | BILLABLE CODE |
| S83.125D | Posterior dislocation of proximal end of tibia, left knee, subsequent encounter | BILLABLE CODE |
| S83.125S | Posterior dislocation of proximal end of tibia, left knee, sequela | BILLABLE CODE |
| S83.126 | Posterior dislocation of proximal end of tibia, unspecified knee | NON-BILLABLE CODE |
| S83.126A | Posterior dislocation of proximal end of tibia, unspecified knee, initial encounter | BILLABLE CODE |
| S83.126D | Posterior dislocation of proximal end of tibia, unspecified knee, subsequent encounter | BILLABLE CODE |
| S83.126S | Posterior dislocation of proximal end of tibia, unspecified knee, sequela | BILLABLE CODE |
