1. Practice of a provider to charge a higher fee to patients with private health insurance plans to make up for underpayment of fees for patients under Medicare, Medicaid, or managed care plans. 2. Practice of a provider charging a group of one managed care plan more than another for the same procedure. One reason this may occur is that one group may have large discounts from the provider or not adequately reimburse the provider for expenses. To make up for the shortage in revenue, the provider may charge another managed care group more.