T34.521 Frostbite with tissue necrosis of right hand

ICD-10-CM T34.521: Frostbite with tissue necrosis of right hand

ICD-10-CM code T34.521 identifies frostbite with tissue necrosis of the right hand. It is an active, billable diagnosis within Chapter 19 under the parent concept T34.52. Frostbite is tissue damage from cold exposure below zero degrees Celsius, and patients face high risk for ischemic tissue injury and necrosis. 1 2 4

Plain-language overview

Frostbite, also known as freezing cold injury, is tissue damage that occurs due to cold exposure at temperatures below zero degrees Celsius, and patients are at high risk for ischemic tissue injury and necrosis. 2

The hand is among the body parts most prone to frostbite, along with the feet, ears, lips, and nose, and certain pre-existing conditions may worsen related tissue damage. 2

What this code represents

The official display label for ICD-10-CM code T34.521 is frostbite with tissue necrosis of right hand, and its semantic type is Injury or Poisoning in the 2026 version of the terminology. 1

Code T34.521 is presented as a billable and specific code with no child codes, and its parent concept is T34.52, frostbite with tissue necrosis of hand. 1 4

Coding details

Code T34.521 is listed in Chapter 19, Injury, poisoning and certain other consequences of external causes, within the frostbite categories T33 through T34 under category T34. 4

The April 2026 reference record lists no inclusion terms, no code first instruction, and no use additional code instruction for T34.521, and the concept has no narrower child concepts. 1 4

Documentation considerations

Careful assessment for systemic hypothermia and full-thickness tissue injury are essential in patients with apparent frostbite, and functional sequelae depend on the extent of tissue injury. 2

What the sources add

While the terminology record establishes the official code label and hierarchy, the clinical reference adds operational context regarding risk factors like peripheral vascular disease, diabetes mellitus, and tobacco use that may worsen tissue injury. 1 2

The terminology record and the coding reference both confirm the active status and parent hierarchy of T34.521, while the coding reference additionally specifies the chapter and billable specificity. 1 4

Sources

1. ICD-10-CM T34.521 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-27.
3. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.
4. ICD-10-CM Code T34.521 | Vero — veroscribe.com; accessed 2026-07-27.