Which root operation would involve altering the position of a body part?

The root operation that involves altering the position of a body part is accurately described by the term "Reposition." In ICD-10-PCS coding, "Reposition" specifically indicates the movement of a body part from one place to another to correct a displacement or malposition. This operation typically aims to restore the body part to its normal anatomical location.

For instance, if a bone is dislocated, the procedure to move it back into its original position would be coded using "Reposition." This aligns well with the definition of this root operation as it emphasizes the dynamic action of changing the body part’s location.

In contrast, other root operations provided in the choices serve different purposes. "Resection" involves cutting away or removing a body part; "Transfer" refers to moving a structure from one location to another without changing its attachment to the body; and "Assistance" is not a recognized root operation in the context of repositioning body parts. Each of these operations has specific definitions that do not align with the process of altering the position of a body part, highlighting why "Reposition" is the correct choice here.