Are Medicare Advantage Provider Directories Accurate? (2026)

A Medicare Advantage provider directory listing is not a promise that your doctor is really in-network. You likely picked your plan partly because that doctor showed up when you searched, and that's reasonable, but those directories are wrong a lot more often than you'd expect. In its Round 3 national review, reported in November 2018, the Centers for Medicare & Medicaid Services (CMS) found nearly half of the listings it checked had at least one error.1 So the honest answer to "are Medicare Advantage provider directories accurate?" is: often not. Confirm each doctor with both the plan and the office before you book.

In This Guide

• Key Takeaways
• What Federal Rules Require of the Network
• How Accurate Are Medicare Advantage Provider Directories?
• What a Wrong Provider Directory Can Cost You
• How to Check Whether a Medicare Advantage Provider Directory Is Accurate
• Frequently Asked Questions
• Learn More

What Federal Rules Require of the Network

Start with the good news, because there is some. A Medicare Advantage plan can't just contract with whoever it likes and leave you driving three hours for a cardiologist. Under federal network-adequacy rules (42 CFR 422.116), a plan has to meet maximum time-and-distance standards and contract with a minimum number of each provider and facility-specialty type.1 Those minimums and distance limits vary by county type, so the bar in a dense city is different from the bar in a rural county.

The list of provider types CMS checks starts with primary care and runs through the major specialties, so cardiology, oncology, surgery, and the rest.1 The point of all this is to make sure the network you're joining actually has enough of the right doctors close enough to you.

Those standards are not absolute, though, and this is the part that matters most if you live somewhere rural. Under 42 CFR 422.116(f), a plan can ask CMS to excuse it from the time-and-distance limits where the providers simply are not in the county, so long as it has instead contracted with providers beyond those limits who are available and accessible to most enrollees. So a plan that "meets the standard" in a rural county may be operating under a granted exception rather than the base table.1

That does not leave you out of luck, and the rule you need sits one section over. Under 42 CFR 422.112(a)(1)(iii), a coordinated care plan must "Arrange for and cover any medically necessary covered benefit outside of the plan provider network, but at in-network cost sharing, when an in-network provider or benefit is unavailable or inadequate to meet an enrollee's medical needs."1 That is the sentence to know: if no in-network provider can actually meet your medical needs, the plan owes you the outside doctor at the in-network price. Ask for it by name and get the answer in writing.

The same section carries three more rights worth knowing. Appointment waits are regulated: emergency or urgently needed care immediately, care you need that is not urgent within 7 business days, and routine and preventive care within 30 business days, with the plan required to continuously monitor access and take corrective action to stay inside those limits. Women get the option of direct access to an in-network women's health specialist for routine and preventive women's health care, with no referral. And if your plan requires referrals in most situations, it must either assign you a primary care doctor to write them or make other arrangements to get you the specialty care.1

So the network itself is regulated. The directory that's supposed to show you that network is a different story, and a much messier one.

How Accurate Are Medicare Advantage Provider Directories?

The provider directory is the online tool you search to find in-network doctors. It should be the easy part. It usually isn't.

CMS's Round 3 online provider directory review, conducted between November 2017 and July 2018 and reported on November 28, 2018, examined 5,602 providers listed at 10,504 locations across 52 Medicare Advantage organizations, about one-third of all of them. CMS found that 48.74% of the directory locations checked had at least one inaccuracy.1 Nearly half. That's not a rounding error, that's closer to a coin flip.

The errors weren't exotic, either. CMS grouped them into a few plain-language buckets: the provider wasn't actually at the location listed, the phone number was wrong, or the provider was shown as accepting new patients when they weren't.1 Any one of those can send you to a closed office, a dead phone line, or a front desk that tells you they're not taking your plan.

That figure comes from a review cycle that ended in July 2018, so treat it as a national snapshot of that period rather than this week's number. But directories haven't magically fixed themselves since, and doctors move, retire, and change which plans they take all the time. A directory is a photograph, and the picture goes stale fast.

What a Wrong Provider Directory Can Cost You

This isn't just an annoyance. With most Medicare Advantage plans, staying in-network is the whole deal, and going outside the network is where the money gets real.

Medicare Advantage plans set a yearly cap on what you pay out of pocket for in-network care, and for 2026 that cap is limited to $9,250 for in-network services (your plan may set it lower).2 Note the wording: that cap is for in-network services. If you see a doctor the directory wrongly listed as in-network and they turn out not to be, that care may not count toward the in-network cap, and depending on your plan type you could owe a lot more, or the whole amount.

So a bad directory listing doesn't just waste an afternoon. It can turn a visit you thought was covered into a surprise bill, and it can happen through no fault of your own, because you did the reasonable thing and trusted the plan's own search tool.

One thing to hold onto if the search comes up empty: a wrong directory is not the end of the road. If the plan has no in-network provider who is actually available or adequate for what you need, 42 CFR 422.112(a)(1)(iii) requires it to arrange for and cover that care out of network at in-network cost sharing.1 That is a request you make to the plan before you go, citing the section, rather than a bill you argue about afterward.

How to Check Whether a Medicare Advantage Provider Directory Is Accurate

The habit worth building: never treat the online directory as the final word. Confirm each provider with two separate sources before you get care.

1. Call the plan's member services. The number is on the back of your insurance card. Ask them to confirm, in their system, that the specific doctor at the specific address is in-network for your plan this year. Ask about the location, not just the name, since a doctor can be in-network at one office and not another.
2. Call the provider's office directly. Ask two things: do they currently take your exact Medicare Advantage plan, and are they accepting new patients. Say the full plan name, not just the insurer, because a carrier can offer several plans and a doctor might take one and not another.
3. Ask about the people behind the doctor, too. If you're scheduling a procedure, the surgeon can be in-network while the anesthesiologist, lab, or facility isn't. It's worth one extra question.

If the plan and the office give you different answers, don't guess. Get it sorted before the appointment, and if the plan's directory sent you wrong, that's worth reporting to the plan, since federal rules hold them responsible for keeping the directory current.

The directory is a fine place to start a search. It's a bad place to end one.

Learn More

Find personalized help confirming whether your doctors are in your Medicare Advantage network at brevy.com.

The information on Brevy.com is for educational purposes only and is not a substitute for professional legal, financial, or medical advice. Rules vary by state and program and change frequently. Always verify with the relevant agency or a qualified professional. Brevy is not a law firm, financial advisor, or healthcare provider.