Learn about the types, causes, and symptoms of broken leg fractures, and how they are diagnosed and treated. Find out when to call a doctor, what home remedies to use, and how long it takes to recover from a broken leg. ICD-10-CM Codes › S00-T88 › S80-S89 › S82- › Unspecified fracture of lower leg S82.9 Unspecified fracture of lower leg S82.9- A broken leg or leg fracture occurs when one or more bones in the leg break or crack. The bones in the leg include the fibula, tibia, and femur. Common causes include falls, motor vehicle accidents and sports injuries. Treatment of a broken leg depends on the location and severity of the injury. A severely broken leg may require metal pins and plates to hold the fragments together. Less severe breaks may be treated with a cast or splint.