Medicare DME supplier question

We are an optician owned optical office signing up to be a medicare dme supplier. We have a part time optometrist who works 2.5 days per week. One of the medicare supplier standards states that a dme supplier cannot share a practice location with another medicare provider. However other medicare opticians have OD's in their office. Our OD does not pay toward overhead, he's an independent contractor. Does anyone have any insight into this rule and how are other offices able to do this?

Medicare DME supplier question