Wiki Piriformis tendon

The piriformis muscle rotates the thigh laterally so it sounds like this might be an adductor tendon. Take a look at the tenotomy codes for the hip area and see if something in that code range applies. Close as I can come to it.
 
actually if you look at it the Piriformis is a Abductor so you would need to use code 27006.

codes 27000 and 27001 are for ADDuctors
 
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