In simple words: This code describes a burn affecting multiple areas of the leg, excluding the ankle and foot. The depth of the burn is not specified.

Burn of unspecified degree of multiple sites of lower limb, except ankle and foot. Use additional external cause code to identify the source, place and intent of the burn (X00-X19, X75-X77, X96-X98, Y92).

Example 1: A patient sustained burns of unspecified degree to their thigh and knee in a house fire. The code T24.09 would be used, along with an external cause code to specify the details of the incident., A patient has burns of unspecified degree on their right thigh and lower leg due to scalding hot water. Code T24.09 would be used, as well as an external cause code to indicate the cause of the burn., A patient presents with multiple burns of unspecified depth across their left lower leg and knee following a motorcycle accident with subsequent fire. T24.09 applies in this case, with an external cause code to document the accident.

Documentation should specify the location and number of burn sites on the lower limb (excluding ankle and foot), cause of the burn, and any associated injuries. If the degree of the burns is known, a more specific code should be used.