Doctors and Medicare Assignment: Reading the Fine Print

Participating, non-participating, and opted out

A participating provider accepts assignment, meaning they accept the Medicare-approved amount as payment in full and bill you only the standard coinsurance. Most physicians and virtually every hospital fall here.

A non-participating provider still bills Medicare but may charge up to fifteen percent above the approved amount. That extra is called an excess charge, and Medicare does not pay it, nor does any supplement except Plans F and G. Plan N, which is otherwise close to Plan G, does not cover excess charges, and that is a genuine difference between the two.

An opted-out provider has signed an agreement to leave Medicare entirely for at least two years. Nothing is billed to Medicare, you pay privately, and no supplement or Advantage plan reimburses it. The practice is required to have you sign a disclosure first, and if it does not, that is a problem worth reporting.

Why the excess charge matters more than it looks

Fifteen percent of an approved amount sounds modest until the service is an expensive one. On a surgical procedure with an approved amount of several thousand dollars, the excess charge can run into the hundreds, and it applies per service, not per year.

For most people this is a minor issue because they see participating physicians. For someone with a specialist, a particular surgeon, or a rural practice that does not participate, it becomes a recurring cost that quietly argues for Plan G over Plan N.

How to check before an appointment

Ask the front desk a specific question: do you accept Medicare assignment, or are you non-participating? The two are different, and asking whether they take Medicare produces a yes from both. You can also check the Medicare Care Compare tool, which lists participation status by clinician.

For a planned procedure, ask for the billing codes in advance and confirm both the facility and the professionals who will be present, since anesthesiologists and radiologists bill separately and are the classic source of a surprise balance.

The Advantage version of the same question

With Medicare Advantage, assignment is not the issue; the network is. A physician can accept Medicare, participate fully, and still be outside your specific plan's network, in which case you either pay out of network or do not go. The question to ask changes to whether the practice is contracted with your exact plan, and the answer changes on January 1.