S82.852H Displaced trimalleolar fracture of left lower leg, subsequent encounter for open fracture type I or II with delayed healing

ICD-10-CM Code S82.852H: Displaced Trimalleolar Fracture of Left Lower Leg

ICD-10-CM code S82.852H identifies a displaced trimalleolar fracture of the left lower leg during a subsequent encounter for an open fracture type I or II with delayed healing. Trimalleolar fractures involve three bony sections of the ankle and often require surgery and physical therapy. 1 5

Plain-language overview

A trimalleolar fracture is a serious injury where three bony sections of the lower leg that form the ankle joint are broken, which can affect quality of life and cause long-term problems. 5

What this code represents

The official terminology record assigns S82.852H the preferred name of displaced trimalleolar fracture of left lower leg, subsequent encounter for open fracture type I or II with delayed healing. 1

The semantic type assigned to code S82.852H within the ICD-10-CM terminology is Injury or Poisoning, and the record status is currently active for version 2026. 1

Coding details

Within the ICD-10-CM hierarchy, code S82.852H is a narrower concept under the parent code S82.852, which is the displaced trimalleolar fracture of the left lower leg. 1

Documentation considerations

Clinical sources indicate that displaced, unstable ankle fractures are often best served by open reduction and internal fixation, and operative management is recommended for open fractures. 3 6

Clinical guidelines note that almost all people who sustain ankle fractures experience some loss of range of motion and strength problems, some of which benefit from physical therapy. 3

What the sources add

While the terminology record defines the specific encounter and healing status for S82.852H, clinical sources add that trimalleolar fractures require surgery and extensive physical therapy. 1 5

Clinical literature describes a specific case where a 65-year-old female suffered a Grade IIIA open trimalleolar fracture-dislocation in a car accident, managed successfully using a single-stage hybrid fixation technique. 2

Sources

1. ICD-10-CM S82.852H terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Single-Stage Hybrid Fixation of a Grade III Open, Unstable Trimalleolar Ankle Fracture with Syndesmotic Disruption and Posterior Talar Subluxation — pmc.ncbi.nlm.nih.gov; accessed 2026-07-27.
3. Physical Therapy Guidelines for Ankle Fracture with Surgery — massgeneral.org; accessed 2026-07-27.
4. BIMALLEOLAR AND TRIMALLEOLAR FRACTURES — ace-pt.org; accessed 2026-07-27.
5. Trimalleolar Fracture: What Is It, Symptoms, Causes & Treatment — my.clevelandclinic.org; accessed 2026-07-27.
6. Open Reduction and Internal Fixation of a Trimalleolar Ankle Fracture | Journal of Medical Insight — jomi.com; accessed 2026-07-27.