An eligible provider or supplier who has entered into an agreement to accept assignment for all services rendered to Medicare patients, and to accept the Medicare approved amount as payment in full for all services rendered. A participating provider or supplier may not ordinarily collect from the beneficiary more than the applicable deductible and coinsurance for covered services. There are significant benefits to become participating such as: higher allowances, toll-free telephone access for electronically submitting claims, no legal charge limits, Medigap transfers and listing in the Participating Physicians/Suppliers Directory.