This article provides general, evergreen education. Medicare rules, plan contracts, costs, and agency guidance can change. Confirm current information through the official sources listed below and the documents that apply to your own coverage.
A provider can be enrolled in Medicare yet handle Medicare payment in different ways. Participation, assignment, and willingness to accept new Medicare patients are related but separate questions.
Medicare enrollment
A provider must be enrolled in Medicare for Medicare to pay under the normal program rules. Enrollment alone does not prove that the provider is participating, accepts assignment for every service, or is accepting new patients.
A patient can receive an incomplete answer by asking only, “Do you take Medicare?”
Verify: Ask separate questions about Medicare enrollment, assignment, and new-patient status.
Participating providers
A participating provider signs an agreement to accept assignment for Medicare-covered Part A and Part B services. The provider accepts the Medicare-approved amount as full payment and bills the beneficiary only for allowed cost sharing and noncovered services.
This generally creates the most predictable Original Medicare billing relationship.
Verify: Use Medicare Care Compare and confirm the status with the billing office.
Nonparticipating providers
A nonparticipating provider may still be enrolled in Medicare and may accept assignment for an individual claim. When assignment is not accepted, the provider may be able to charge more than the Medicare-approved amount, subject to applicable limiting-charge rules.
The amount and claim process can differ from a participating-provider visit.
Verify: Ask whether assignment will be accepted for the specific service, not merely whether it has been accepted before.
Opt-out providers
Some physicians and practitioners formally opt out of Medicare and use private contracts with Medicare beneficiaries. Medicare generally does not pay for services covered by the private contract, except under limited emergency or urgent circumstances.
A patient who signs without understanding the contract may become responsible for the full charge.
Verify: Read any private contract carefully and confirm the provider’s status before receiving care.
Accepting new patients
A provider can participate in Medicare but have a closed panel for new Medicare patients. Conversely, a provider may accept new patients but be out of network for a Medicare Advantage plan.
Original Medicare participation and Medicare Advantage network status are different systems.
Verify: State the exact coverage name when scheduling and ask the office to verify it.
Questions for the office
Useful questions include whether the provider is enrolled in Medicare, participates, accepts assignment for the service, is accepting new Medicare patients, expects any noncovered charges, and will submit the claim.
Written estimates and advance notices can clarify expected responsibility, but they do not replace the final Medicare claim decision.
Verify: Keep the name of the person who answered, the date, and any written estimate or notice.
Common misunderstandings
- “Takes Medicare” always means “accepts assignment.” It does not.
- A Medicare Advantage network listing proves Original Medicare participation. These are separate determinations.
- A provider who saw me before must continue accepting my coverage. Provider status and availability can change.
Questions to consider
- Is the provider enrolled in Medicare?
- Is the provider participating?
- Will assignment be accepted for this service?
- Is the provider accepting new patients with my exact coverage?
- Will I receive an advance notice for a service that may not be covered?