With a point-of-service health insurance plan, you have the choice of using any physician and getting any service without needing a referral from your primary care doctor (like in an indemnity plan). However, the insurance carrier has a network of doctors, hospitals and other care providers that it has negotiated discounts with, and you have a financial incentive to use those "in-network" providers. You'll pay more (usually, a lot more) for using out-of-network doctors and hospitals.
The premiums usually run a little less than traditional indemnity plans, and there may be less paperwork because your doctor's office will likely have frequent (if not daily) contact with the insurance company.
Find out more about this book:YOU: The Smart Patient: An Insider's Handbook for Getting the Best Treatment