After 26 years in working for physicians' offices, I started working for a DME business late last summer. We just became CHAP accredited and are filling out a Medicare Provider application. My question is - If we see a patient who has Medicare primary, can we bill Medicare DMERC (ie., before we send our provider application)? Are there any rules for checking boxes, etc., that are different from physician billing? Any help would be greatly appreciated - thank you!