S90.445 External constriction, left lesser toe(s)

ICD-10-CM S90.445: External constriction, left lesser toe(s)

ICD-10-CM code S90.445 identifies external constriction of the left lesser toe(s) and is an active diagnosis concept within the Injury or Poisoning semantic type. It is a specific concept nested under the broader parent category for external toe constriction, falling within chapter nineteen for injuries and related consequences. 1 4

Plain-language overview

Code S90.445 represents a diagnosis of external constriction affecting the left lesser toes, classified under the semantic type of Injury or Poisoning in the ICD-10-CM version 2026 terminology. 1

What this code represents

S90.445 is an active ICD-10-CM concept with no narrower child concepts, meaning it represents a specific diagnosis endpoint rather than a broad grouping for further code subdivision. 1

Coding details

The code S90.445 is a direct child of the parent concept S90.44, which designates external constriction of a toe within the ICD-10-CM hierarchy for ankle and foot injuries. 1 4

The parent category S90.44 resides in Chapter 19 for injury and poisoning consequences, specifically within the S90-S99 block for ankle and foot injuries under superficial toe injury subcategories. 4

Documentation considerations

The official terminology record for S90.445 establishes the exact preferred name as external constriction, left lesser toe(s), which serves as the designated label for this specific diagnosis concept. 1

Coverage and utilization context

External constriction toe codes appear in Medicare billing guidance articles for debridement services, which provide billing and coding guidelines for adjacent toe constriction diagnoses. 2 3

What the sources add

The National Cancer Institute terminology record establishes the official preferred name and active status for S90.445, while the Veroscribe record provides the broader chapter and block hierarchy context. 1 4

Medicare billing articles reference related external constriction toe codes with encounter extensions, such as initial or subsequent encounters, illustrating how payer guidance addresses adjacent S90.44 codes. 2 3

Sources

1. ICD-10-CM S90.445 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Article - Billing and Coding: Debridement Services (A56459) — cms.gov; accessed 2026-07-27.
3. Article - Billing and Coding: Debridement Services (A56459) — cms.gov; accessed 2026-07-27.
4. ICD-10-CM S90.44: External constriction of toe | Vero — veroscribe.com; accessed 2026-07-27.