Final answer:
Degloving injuries to the extremities are coded to the external ISS body region because they involve the skin and subcutaneous tissues rather than specific to bones or organs.
Step-by-step explanation:
Degloving injuries to extremities are typically recorded based on the Injury Severity Score (ISS), which categorizes injuries into different body regions for the purpose of injury assessment and management. Although extremities are involved, the degloving injury itself is coded to the external ISS body region. This external body region coding captures injuries that are not specific to bones or organs but to the skin and subcutaneous tissues that encompass or span multiple body regions, which is characteristic of degloving injuries.