Excision of fabella

Can anyone give me some ideas on what CPT® code to use on the open excision of a fabella behind the knee? It's almost like a floating piece of bone per the Dr.
Not sure what to use? Maybe an unlisted and if so what code is comparable to it?
Thank you!!

re: Excision of fabella

I'm thinking you may mean the "patella"? [ iow: the kneecap ]