Final answer:
The staff's requirement for Mary to have a referral from her primary care provider before seeing a dermatologist exemplifies a managed care plan that requires a primary care provider as the initial point of contact.
Step-by-step explanation:
Mary must have a referral from her primary care provider before she can see the dermatologist for a skin consultation and cancer evaluation. This requirement is an example of a managed care plan that requires a primary care provider, often a generalist, to be the first point of contact for the patient.