S83.115 Anterior dislocation of proximal end of tibia, left knee

ICD-10-CM S83.115: Anterior dislocation of proximal end of tibia, left knee

ICD-10-CM code S83.115 identifies an anterior dislocation of the proximal end of the tibia at the left knee. It is an active terminology concept classified as an injury or poisoning. The code belongs to a broader category of anterior tibial subluxations and dislocations, with more specific encounter variations available for clinical documentation. 1 5

Plain-language overview

Code S83.115 describes an injury where the proximal end of the tibia dislocates anteriorly at the left knee, and this specific terminology record is currently active within the ICD-10-CM version 2026 system. 1

What this code represents

The semantic type assigned to S83.115 is Injury or Poisoning, and the concept has no narrower subordinate concepts within the official terminology hierarchy. 1

S83.115 is a child concept under the parent code S83.11, which broadly encompasses anterior subluxation and dislocation of the proximal end of the tibia. 1

Coding details

Code S83.115 distinguishes the left knee injury from S83.114 for the right knee and S83.116 for an unspecified knee, establishing laterality within the anterior dislocation category. 3

The code tree lists more specific variations of S83.115, including S83.115A for initial encounter, S83.115D for subsequent encounter, and S83.115S for sequela. 5

Documentation considerations

The code tree for S83.115 provides distinct variations for initial encounter, subsequent encounter, and sequela, which are available for documenting this left knee injury. 5

Coverage and utilization context

A Medicare policy article for knee orthoses references the left knee anterior dislocation concept alongside the right knee initial encounter, indicating its appearance in coverage documentation. 4

What the sources add

Whereas the terminology record defines the code hierarchy, the clinical literature describes anterior proximal tibiofibular joint dislocations as uncommon injuries that may be easily missed on plain radiography. 1 2

Clinical literature notes that proximal tibiofibular joint dislocation typically occurs when the knee is slightly flexed and the foot is rotated and plantar flexed, adding context absent from the pure terminology sources. 2

Sources

1. ICD-10-CM S83.115 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Proximal tibiofibular dislocation — pmc.ncbi.nlm.nih.gov; accessed 2026-07-27.
3. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.
4. Article - Knee Orthoses - Policy Article (A52465) — cms.gov; accessed 2026-07-27.
5. ICD-10-CM 2024 | S83.11 - Anterior subluxation and dislocation of proximal end of tibia — unboundmedicine.com; accessed 2026-07-27.