S83.122A (Posterior subluxation of proximal end of tibia, left knee, initial encounter) compared with S83.123A (Posterior subluxation of proximal end of tibia, unspecified knee, initial encounter), from the official CMS tabular data. S83.122A and S83.123A code the same condition on opposite sides.
Same condition; these differ only in which side is documented.
These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.
Source: ICD-10-CM tabular list (laterality variant derived from the code title)
Same condition, opposite side. S83.122A and S83.123A name the same condition on opposite sides of the body.
Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.
| S83.122APosterior subluxation of proximal end of tibia, left knee, initial encounter | S83.123APosterior subluxation of proximal end of tibia, unspecified knee, initial encounter | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) |
| Definition | Posterior subluxation of proximal end of tibia, left knee, initial encounter is a billable ICD-10-CM diagnosis code (S83.122A). | Posterior subluxation of proximal end of tibia, unspecified knee, initial encounter is a billable ICD-10-CM diagnosis code (S83.123A). |
| 7th character | The appropriate 7th character is to be added to each code from category S83 | The appropriate 7th character is to be added to each code from category S83 |
| Includes | avulsion of joint or ligament of knee laceration of cartilage, joint or ligament of knee sprain of cartilage, joint or ligament of knee traumatic hemarthrosis of joint or ligament of knee | avulsion of joint or ligament of knee laceration of cartilage, joint or ligament of knee sprain of cartilage, joint or ligament of knee traumatic hemarthrosis of joint or ligament of knee |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources