What's the difference between in-network and out-of-network coverage?

An in-network provider has a contract with your insurance carrier and accepts negotiated rates as full payment. You pay the cost-sharing the plan defines (deductible, copay, coinsurance) and the provider can't balance-bill the difference between their list price and the negotiated rate. An out-of-network (OON) provider has no contract with your carrier. The plan may pay something — but typically less, with a separate (higher) OON deductible and coinsurance, and the provider can balance-bill you for the difference between their charge and what the plan paid. The financial gap is often large: an in-network MRI might cost you $200; the same MRI out-of-network might cost $1,500+. Two protections soften this: the federal No Surprises Act bars most balance-billing for emergency care and for non-emergency care delivered by OON providers at in-network facilities; NY has parallel state protections. For non-emergency, non-facility care, the protection ends — staying in-network is the only way to control cost.