Point-of-service plans are similar to PPOs, but they introduce the gatekeeper, or Primary Care Physician. You'll need to choose your PCP from among the plan's network of doctors.

As with the PPO, you can choose to go out of network and still get some kind of coverage. In order to get a referral to a specialist, though, you usually must go through your PCP. You can still choose to refer yourself, but it'll mean more hassles and more money coming out of your pocket. If your PCP refers you to a doctor who is out of the network, the plan should pick up most of the cost. But if you refer yourself out, then you'll probably have to deal with more paperwork and a smaller reimbursement. You may also have to pay a deductible if you go outside the network.

POS plans may also cover more preventive care services, and may even offer health improvement programs like workshops on nutrition and smoking cessation, and discounts at health clubs.