S42.471B Displaced transcondylar fracture of right humerus, initial encounter for open fracture

ICD-10-CM S42.471B: Displaced transcondylar fracture of right humerus, initial encounter for open fracture

ICD-10-CM code S42.471B identifies a displaced transcondylar fracture of the right humerus during an initial encounter for an open fracture. The concept is classified as an injury or poisoning and is an active terminology record with a parent code for the same right humerus fracture. 1

Plain-language overview

The terminology record assigns S42.471B the preferred name of displaced transcondylar fracture of right humerus, initial encounter for open fracture, and classifies its semantic type as injury or poisoning. 1

What this code represents

S42.471B is an active concept in the ICD-10-CM version 2026 terminology that has narrower concepts and is linked to the parent concept S42.471 for a displaced transcondylar fracture of the right humerus. 1

Clinical context

Displaced fractures are more severe injuries and may result in a late deformity despite appropriate treatment, and vascular compromise has been reported in 10 to 20 percent of displaced supracondylar humerus fractures. 2

Documentation considerations

The official code label specifies right humerus laterality, a displaced transcondylar fracture, and an initial encounter for an open fracture, which are the distinct elements established by the terminology record. 1

What the sources add

While the terminology record defines the exact diagnosis code and its hierarchical structure, the clinical text describes the severity and vascular risks of displaced supracondylar humerus fractures without specifically defining S42.471B. 1 2

Both the Medicare billing article and the partial thromboplastin time document list S42.471B alongside other humerus fracture codes, showing its appearance across different administrative code lists. 3 4

Questions to verify

Verification is needed regarding the specific clinical distinction between a transcondylar fracture and a supracondylar humerus fracture, as the clinical excerpt discusses supracondylar injuries rather than transcondylar ones. 1 2

Sources

1. ICD-10-CM S42.471B 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: Immunizations (A56900) — cms.gov; accessed 2026-07-27.
4. 190.16 - Partial Thromboplastin Time (PTT) — hnl.com; accessed 2026-07-27.