S82.852S Displaced trimalleolar fracture of left lower leg, sequela

ICD-10-CM S82.852S: Displaced Trimalleolar Fracture of Left Lower Leg, Sequela

ICD-10-CM code S82.852S identifies a sequela of a displaced trimalleolar fracture of the left lower leg. A trimalleolar fracture involves breaks in three ankle malleoli. This terminology record is active and classifies the concept as an injury or poisoning. The code appears in a Medicare knee orthoses policy article. 1 2 3

Plain-language overview

A trimalleolar ankle fracture indicates that the three ankle malleoli, specifically the medial, lateral, and posterior structures, are broken, and the ankle joint consists of the ankle bone and the ends of the two lower leg bones. 2 4

What this code represents

The official preferred name for S82.852S is displaced trimalleolar fracture of left lower leg, sequela, and the terminology record assigns this active code a semantic type of injury or poisoning. 1

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

Clinical context

Trimalleolar fractures represent approximately seven percent of all ankle fractures annually, while bimalleolar fractures account for about twenty percent of such fractures. 2

Comorbidities affecting ankle fracture prognosis include diabetes, peripheral vascular disease, peripheral neuropathy, inflammatory joint diseases, obesity, and kidney diseases. 2

Coverage and utilization context

A Medicare policy article for knee orthoses includes S82.852S within a listed code range spanning from S82.851A through S82.852S, alongside other lower leg fracture codes. 3

What the sources add

The National Cancer Institute terminology record establishes the official code label and hierarchical status, whereas the clinical bookshelf source provides background on the anatomical definition and frequency of trimalleolar fractures. 1 2

The National Cancer Institute terminology record provides the official preferred name for S82.852S, while the Medicare policy article lists the exact code S82.852S within a broader range of lower leg fracture diagnoses. 1 3

Documentation considerations

The terminology record for S82.852S specifies the parent concept as S82.852 and classifies the active code's semantic type as injury or poisoning, but provides no further clinical documentation guidelines. 1

Sources

1. ICD-10-CM S82.852S terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-27.
3. Article - Knee Orthoses - Policy Article (A52465) — cms.gov; accessed 2026-07-27.
4. S82.852H — Displaced trimalleolar fracture of left lower leg, subsequent encounter for open fracture type I or II with delayed healing | ICD-10 Code · Eleplan — eleplan.com; accessed 2026-07-27.