At 68 With $800,000, He’ll Find Out His New Doctor Doesn’t Accept Medicare Assignment. The Bill Can Run Up to 15% Higher

He’s 68, on Original Medicare, and at the kitchen table reading a bill from the new doctor he chose after his move. The total is higher than what Medicare approved. The difference comes from something he never thought to ask about: whether the office accepts Medicare assignment.

He has $800,000 in retirement savings, so one bill won’t hurt him much. A specialist he sees for years is another story. Many retirees get this same surprise after switching doctors, and it’s easy to avoid once you know the rules.

What Accepting Assignment Means in Plain English

Medicare sets a price for each covered service. That price is called the Medicare-approved amount. A doctor who accepts assignment agrees to take that price as full payment. Medicare.gov says these doctors charge you only the Medicare deductible and coinsurance, and they file the claim for you.

Once he’s paid the $283 Part B deductible for 2026, he usually owes 20% of the approved amount. Doctors fall into three groups:

1. Participating doctors accept assignment for every Medicare-covered service. Medicare.gov says most doctors are in this group, but it still tells patients to check.
2. Non-participating doctors stay in Medicare but only accept assignment case by case. When they don’t accept it, they can bill above the approved amount. In many cases, the bill can’t go more than 15% above it, and that cap is called the limiting charge. It doesn’t apply to equipment or medical supplies, and some states have laws that limit or prohibit these extra charges.
3. Opt-out doctors leave Medicare for at least 2 years. Medicare pays nothing for their services except in emergencies. Patients sign a private contract and pay the doctor directly.

Paying Up Front at a Non-Participating Office

At a non-participating office, he might have to pay the whole bill at the visit. The office should still send the claim to Medicare and can’t charge him for doing it. If the office won’t file, Medicare.gov says he can file the claim himself. In practice, that means he covers the full cost first and waits for Medicare’s share.

Running the Numbers on a $1,000 Visit

Here are the assumptions: a $1,000 Medicare fee schedule amount for the participating doctor, a deductible he’s already met, Medicare paying its usual 80% share, and a non-participating doctor who bills the full limit charge.

That’s $132.50 more for the same care. If he needs a procedure plus follow-up visits that add up to $10,000 in approved charges in a year, the extra could hit $1,325. Medical costs already weigh more on older families. The government’s research inflation index for Americans 62 and older reached a one-year high of 368.8 in October.

Switching Doctors Usually Beats Paying the Surcharge

For most people in his spot, the best move is a doctor who accepts assignment. The care is the same, and the bill’s lower. Paying up to 15% extra only makes sense if this doctor is truly hard to replace, like a rare specialist with no nearby alternative.

If he wants to keep the doctor, Medigap is his backstop. Medicare.gov’s comparison chart shows that only Plan F and Plan G cover Part B excess charges. Not everyone can buy Plan C or Plan F, because eligibility depends on when you first qualified for Medicare. That’s why Plan G is the realistic pick for many newer enrollees.

If he’s on Plan N or another plan without this benefit, he pays the excess himself. Before switching plans, he should check whether the insurance company will ask health questions. Our Medicare and Medigap coverage comparisons detail these plans in more detail. Medicare Advantage plans work differently, since the plan’s network rules decide what he pays.

An opt-out doctor is the priciest choice. Medicare pays nothing, so he’d cover every dollar himself. Medicare.gov suggests calling your State Health Insurance Assistance Program before you sign a private contract. Assignment is just one of the Medicare line items that quietly raises a retiree’s bills, alongside IRMAA surcharges and coverage gaps we mapped in a free guide to Medicare’s hidden costs.

Ask This Before Every First Appointment

Start with Medicare.gov’s provider search tool, which shows whether a doctor accepts assignment or participates in Medicare. Then call the office. Asking whether they “take Medicare” won’t answer it, because a non-participating office can truthfully say yes and still bill him the excess.

Here’s the question to ask any new doctor’s office: “Do you accept Medicare assignment?” If the answer is yes, he’ll owe only his deductible and coinsurance. If it’s no, he can find another doctor or make sure his Medigap plan covers the difference before he books.

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