What is the correct ICD-10-PCS code for a proximal femoral osteotomy performed on a patient with a malunion of an intertrochanteric fracture?

The correct ICD-10-PCS code for a proximal femoral osteotomy in the case of a malunion of an intertrochanteric fracture is 0Q860ZZ.

This code is structured to reflect the nature of the procedure and the specific anatomical site involved. The first character, '0,' indicates that the procedure is taking place in the anatomical system of the lower extremities. The second character, 'Q,' specifies that the procedure involves the femur. The '8' signifies an osteotomy, which is a surgical procedure that involves cutting and reshaping bones.

The '6' in the fifth character denotes that the procedure is being carried out on the proximal part of the femur, which aligns perfectly with the requirement for the proximal femoral osteotomy. The last two characters, 'ZZ,' indicate that there is no device used and that it is an open procedure.

Hence, this code accurately captures the essence of the surgery being performed on the patient suffering from a malunion of an intertrochanteric fracture, making it the ideal choice among the options provided.