B20 means it was furnished by another provider or a duplicate by another provider if I remember correctly? 76 modifier it was done by the same physician twice, 77 modifier if it was done by another provider as well as your provider.
Thank you so much but I tried that but the services weren't rendered twice. I called medicare the Facility billed and got paid with the same CPT® on hcfa but from the facility. When I bill for mines it's denied b20. I don't know what else to do because I cannot bill with modifier 26 for professional component because his stating that the other biller billed for the professional/ the same dr. In this case what can I do?