S52.621 Torus fracture of lower end of right ulna

ICD-10-CM S52.621: Torus fracture of lower end of right ulna

ICD-10-CM code S52.621 designates a torus fracture of the lower end of the right ulna. Clinical literature indicates that torus fractures are injuries observed in the pediatric population, affecting the distal forearm bones. The available sources establish the code's official label and its pediatric clinical context, though they do not provide complete coding or billing guidelines. 1 3 4

What this code represents

ICD-10-CM code S52.621 represents the diagnosis of a torus fracture of the lower end of the right ulna, with the official display label confirmed for the 2026 version of the coding system. 3 4

Plain-language overview

A torus fracture is a type of bone injury evaluated in clinical studies alongside other forearm fractures like greenstick and complete fractures, specifically focusing on injuries to the distal radius and ulna. 1

Clinical context

Clinical research on torus fractures of the distal forearm specifically examines these injuries in children, including pediatric patients presenting to emergency departments with fractures of the distal radius or ulna. 1

In clinical studies of pediatric distal forearm torus fractures, the injury can occur as an isolated fracture of the ulna, an isolated fracture of the radius, or as a fracture involving both bones simultaneously. 1

Documentation considerations

Clinical literature distinguishes torus fractures from other pediatric forearm fracture patterns such as plastic deformation, greenstick, and comminuted fractures, which are defined by the extent of the break in the bone. 2

Clinical trials for pediatric forearm fractures establish specific exclusion criteria that differentiate torus fractures from other injuries, such as excluding patients with torus fractures of both the ulna and radius from certain diaphyseal fracture studies. 2

What the sources add

The EVS Explore sources provide the official ICD-10-CM terminology and version release date, while the PMC sources provide the pediatric clinical trial context and injury classifications, together establishing both the coding definition and the clinical presentation of the condition. 1 2 3 4

The EVS Explore sources confirm the base code S52.621 and reference specific encounter extensions such as S52.621A and S52.621G, whereas the PMC sources describe the comparative clinical interventions for these pediatric forearm injuries. 1 3 4

Sources

1. Interventions for treating wrist fractures in children — pmc.ncbi.nlm.nih.gov; accessed 2026-07-25.
2. Conservative interventions for treating diaphyseal fractures of the forearm bones in children — pmc.ncbi.nlm.nih.gov; accessed 2026-07-25.
3. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-25.
4. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-25.