S92.524K Nondisplaced fracture of middle phalanx of right lesser toe(s), subsequent encounter for fracture with nonunion

ICD-10-CM S92.524K: Nondisplaced fracture of middle phalanx of right lesser toe(s), subsequent encounter for fracture with nonunion

ICD-10-CM code S92.524K identifies a nondisplaced fracture of the middle phalanx of the right lesser toe(s) during a subsequent encounter for fracture with nonunion. The concept is classified with the semantic type of Injury or Poisoning, and its parent concept is S92.524. This code is distinct from routine healing, delayed healing, and sequela encounters. 1 5

Plain-language overview

Code S92.524K describes a broken right lesser toe bone that has not shifted out of place, specifically noting a subsequent medical encounter where the fractured bone has failed to heal together properly. 1

What this code represents

The terminology record assigns S92.524K the semantic type of Injury or Poisoning, and the code maintains an active record status within the 2026 version of the ICD-10-CM terminology. 1

S92.524K is a child concept of S92.524, which is the nondisplaced fracture of the middle phalanx of the right lesser toe(s), providing the category hierarchy for this specific nonunion encounter. 1

Coding details

The seventh character K in S92.524K specifies a subsequent encounter for fracture with nonunion, distinguishing it from the G character for delayed healing and the D character for routine healing. 5

S92.524K specifies right laterality, distinguishing it from S92.525K, which represents the nondisplaced fracture of the middle phalanx of the left lesser toe(s) with nonunion. 5

Documentation considerations

The official terminology for S92.524K explicitly specifies the right lesser toe, middle phalanx, nondisplaced status, and nonunion complication as the defined elements of this diagnosis concept. 1

Clinical context

Nonunion occurs when a stress fracture fails to heal completely, and high-risk fractures at sites with poor vascular supply carry a greater risk of delayed union, nonunion, or displacement. 2

What the sources add

The terminology record defines the code's clinical meaning and hierarchy, while a clinical reference text provides general medical context regarding nonunion as a failure of complete fracture healing. 1 2

Coverage and utilization context

Medicare billing articles mention related lesser toe fracture codes with sequela and nonunion, but the supplied excerpts do not explicitly list S92.524K within those specific home health therapy policies. 3 4

Sources

1. ICD-10-CM S92.524K 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: Home Health Occupational Therapy (A53057) — cms.gov; accessed 2026-07-27.
4. Article - Billing and Coding: Physical Therapy - Home Health (A57311) — cms.gov; accessed 2026-07-27.
5. ICD-10-CM 2024 | S92.5 - Fracture of lesser toe(s) — unboundmedicine.com; accessed 2026-07-27.