Strain of msl/fasc/tnd post grp at thi lev, unsp thigh, init

This code signifies a non-traumatic overstretching or tearing of the muscles, fascia, or tendons located in the posterior compartment of the thigh. This typically involves the hamstring muscle group. The "unspecified thigh" indicates that the laterality (left or right) of the injury is not documented.

Apply this code for initial encounters with patients presenting with symptoms consistent with a hamstring strain, such as pain, tenderness, or swelling in the back of the thigh, where the specific muscle involved is not detailed and the affected side is not specified. This is appropriate when the injury is acute and the patient is receiving active treatment.

• Only use this code when the laterality of the thigh injury is truly unspecified in the medical record.
• Ensure the documentation clearly indicates an "initial encounter" for the injury.
• Avoid this code if a more specific hamstring muscle (e.g., biceps femoris) or laterality (e.g., right thigh) is documented.