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If you need to pay your doctor, you can check out medical credit cards like the Synchrony CareCredit card. Most of these cards can be used for specific medical procedures and for doctor visits at particular medical institutions and providers. That means your options will be even more limited than if you'd have used a general credit card.
A better idea is to find a credit card with a 0% interest on purchases for the first year promotion. General credit cards can be used everywhere they are accepted. That means if a doctor accepts credit cards as a method of payment, you will be able to pay with your general credit card.