THIS IS COMPLETELY UNTRUE. Walmart takes ALL major insurance companies. They take co-payments.... It is COMPLETELY illegal to accept any amount of money from a Medicaid patient in cash if the clinic/office is a Mainecare provider.
The trick then is NOT to be a Mainecare (or other medicaid) provider. Then when you charge them CASH, it is not illegal. I suspect they don't take Medicaid. They want REAL bucks.
They realize that many of the people who come to walk in clinics have no concept of quality of care, nor does the patient care. They want a return to work note, they want antibiotics for their viral sore throat and they want to be seen without bringing up their weight, diabetes or other preventive measures we hound them on. I guess you get what you wish for.