Trauma and injury coding in ICD-10-CM encompasses a comprehensive classification system for documenting various types of injuries, their causes, and outcomes. The coding structure follows anatomical organization, beginning with head and neck injuries (S00-S19), proceeding through thorax and trunk (S20-S39), to extremities (S40-S99). Effects and complications codes (T07-T88) cover multiple body regions, foreign bodies, burns, frostbite, poisoning, and various complications. External cause codes document the circumstances of injuries, including transport accidents (V00-V99), falls, exposure to forces, and intentional harm. The system incorporates place of occurrence (Y92) and activity codes (Y93) to provide context. Encounter classification uses 7th character extensions to distinguish between initial (A) and subsequent encounters (D), with specific indicators for healing status. Sequela coding (S) documents late effects of injuries, requiring clear documentation of the time gap between original injury and resulting condition. Multiple injury coding follows a hierarchy prioritizing the most severe injuries, with specific guidelines for combining injuries and sequencing codes. This structured approach ensures accurate documentation of injury severity, causation, treatment phase, and outcomes in medical records