S82: Fracture of lower leg, including ankle
S82.5: Fracture of medial malleolus
There are 2 bones in the lower leg. The tibia is on the inside of the lower leg. The fibula is on the outside of the lower leg.
The malleolus bones are bony prominences at the base of the lower leg bones. The medial malleolus is part of the tibia. The lateral malleolus is part of the fibula. You have broken your medial malleolus.
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