S32.312S Displaced avulsion fracture of left ilium, sequela

ICD-10-CM S32.312S: Displaced avulsion fracture of left ilium, sequela

ICD-10-CM code S32.312S identifies a sequela of a displaced avulsion fracture of the left ilium. The terminology record classifies this concept as an injury or poisoning. General clinical literature notes avulsion fractures involve bone pulled away by soft tissue forces, which can become displaced depending on surrounding attachments. 1 2 4

Plain-language overview

An avulsion fracture occurs when tensile force through soft tissue pulls a piece of bone away, and displacement depends on whether intact soft tissue attachments prevent fragment migration. 2

What this code represents

The official preferred name for S32.312S is displaced avulsion fracture of left ilium, sequela, and the concept carries the semantic type of injury or poisoning. 1 4

S32.312S is an active terminology concept that has narrower concepts and falls under the parent concept S32.312, displaced avulsion fracture of left ilium. 1

Coding details

A related initial encounter for open fracture code, S32.312B, is identified as billable and maps to the Hip Fracture/Dislocation category under the CMS-HCC V28 risk adjustment model. 5

The target code S32.312S appears in an official Medicare billing and coding article alongside S32.314A, a nondisplaced avulsion fracture of the right ilium for an initial closed fracture encounter. 3

Documentation considerations

Clinical literature states that discerning the mechanism of injury is important, and a history of an acute event without previous pain may help differentiate acute avulsion fractures from chronic changes. 2

When an avulsion fracture is suspected but not visualized on plain radiograph, clinical suspicion should lead to further workup including advanced imaging such as CT, MRI, or ultrasound. 2

What the sources add

While the terminology record establishes the official code label and hierarchy, the clinical excerpt adds general context that avulsion fractures can result from acute events, chronic repetitive stress, surgical complications, or pathologic conditions. 1 2

The terminology record and the Medicare article both list S32.312S, but only the terminology record provides the parent concept and semantic type, whereas the Medicare article places the code within a billing context. 1 3

Sources

1. ICD-10-CM S32.312S terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-27.
3. Article - Billing and Coding: Total Joint Arthroplasty (A56777) — cms.gov; accessed 2026-07-27.
4. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.
5. 2026 ICD-10-CM S32.312B: Displaced avulsion | HCC 402 — hccbuddy.com; accessed 2026-07-27.