S82.431B Displaced oblique fracture of shaft of right fibula, initial encounter for open fracture type I or II

ICD-10-CM S82.431B: Displaced oblique fracture of shaft of right fibula, initial encounter for open fracture type I or II

ICD-10-CM code S82.431B identifies a specific right fibula injury characterized as a displaced oblique shaft fracture during an initial encounter for an open fracture type I or II. This active terminology record classifies the concept as an injury or poisoning, providing precise classification for clinical encounters. 1

Plain-language overview

A displaced fibula fracture indicates the broken bone pieces moved enough to create a gap, while an oblique fracture features an angled break line across the calf bone. 5

An open fracture involves the broken bone or fracture hematoma being exposed to the external environment through a traumatic soft tissue and skin violation. 2

What this code represents

The official label for S82.431B is displaced oblique fracture of shaft of right fibula, initial encounter for open fracture type I or II, and it holds an active record status. 1

Code S82.431B is a narrower concept under the parent code S82.431 for a displaced oblique fracture of the right fibula shaft, and carries the semantic type of injury or poisoning. 1

Coding details

Official coding manuals list S82.431B alongside distinct codes for type IIIA, IIIB, or IIIC open fractures, and a Medicare billing article includes S82.431B within its listed codes. 3 4

Documentation considerations

Clinical documentation for open fractures should characterize the wound according to the Gustilo-Anderson classification system, as this directly dictates initial treatment decisions. 2

Evaluating an open fracture involves reviewing workup procedures including diagnostic imaging and laboratory studies, alongside a thorough physical examination of the wound. 2

What the sources add

While terminology records define the exact code label and hierarchy, clinical references explain that Gustilo-Anderson type I open fractures are low energy injuries with wounds less than one centimeter. 1 2

A Medicare billing article lists S82.431B among valid codes, but the supplied excerpt does not state whether inclusion in this policy implies any specific payer coverage for the fracture diagnosis. 4

Sources

1. ICD-10-CM S82.431B terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-27.
3. ICD-10-CM/PCS MS-DRG v36.0 Definitions Manual — cms.gov; accessed 2026-07-27.
4. Article - Billing and Coding: Immunizations (A56900) — cms.gov; accessed 2026-07-27.
5. How Long Does It Take To Recover From a Fibula Fracture? — my.clevelandclinic.org; accessed 2026-07-27.
6. Tibia and Fibula Fracture Management in the ED — emedicine.medscape.com; accessed 2026-07-27.