" Proximal row carpectomy with implant arthroplasty of the capitate"

I believe it’s fairly new. None of the wrist hemiarthroplasty codes work for this. There are codes for lunate, trapezium, and scaphoid. And 25215 for proximal row carpectomy does not cover the arthroplasty.

Unlisted? Or 25446 with modifier 52, since the distal ulna is is not replaced?

Thank you!
Cindy