A Point of Service (POS) plan is a type of managed healthcare system that combines characteristics of the HMO and the PPO. Like an HMO, you pay no deductible and usually only a minimal co-payment when you use a healthcare provider within your network. You also must choose a primary care physician who is responsible for all referrals within the POS network. If you choose to go outside the network for healthcare, POS coverage functions more like a PPO. You will likely be subject to a deductible, and your co-payment will be a substantial percentage of the physician's charges.