Is Your Doctor Really in the Plan? How to Check a Medicare Advantage Network for 2027, Plus the New Directory Law
Before you pick a 2027 Medicare Advantage plan, call each of your doctors’ offices and ask, “Are you in this exact plan’s network for 2027?” Plan directories can be wrong. A new federal law will require plans to check their lists every 90 days starting in 2028, and CMS proposed the details on Oct 16, 2026 (CMS).
Open Enrollment runs from Oct 15 to Dec 7, 2026. Coverage you pick starts Jan 1, 2027. Once you’re in, you can’t just switch whenever you want. So it pays to check your doctors now.
Why plan directories go wrong
Every Medicare Advantage plan has a list of doctors, hospitals and other providers it works with. That list is the provider directory. If a doctor is “out of network,” you may pay much more, or the plan may not pay at all, except in emergencies.
The trouble is that directories go stale. Doctors retire, move or stop taking a plan. Phone numbers change. Some listings stay up long after the doctor has left. People call these “ghost networks.”
Congress took notice. The Consolidated Appropriations Act, 2026, signed Feb 3, 2026, includes the REAL Health Providers Act. It sets new directory rules for Medicare Advantage plans (CMS).
What the new law and CMS rule would do
CMS published its proposed rule (CMS-4214-P) in the Federal Register on Oct 20, 2026. Here is what it would require, starting in 2028 (Federal Register):
- Check every 90 days. Plans must verify each doctor’s listing at least once every 90 days. For certain hospital and facility services, CMS proposes at least once every 12 months.
- Flag what they can’t confirm. If a plan can’t verify a listing, the directory must say the information may not be up to date.
- Remove departed doctors fast. A doctor who leaves the network must come off the directory within 5 business days. Other changes must be made within 30 days.
- Protect your wallet. If a doctor was listed as in-network on the day you made the appointment, but turns out to be out of network when you’re seen, you pay no more than in-network cost sharing.
- Grade the plans. Each year, plans must test a random sample of listings and get an accuracy score. Starting in 2029, that letter grade must appear in the plan’s directory, and CMS must publish the scores.
The CMS example in the rule makes it real. A member finds a cardiologist listed in-network, books on Jan 5, 2028, is seen on March 6, 2028, then gets a bill at the out-of-network rate. Under the new rules, the plan would have to fix that to the in-network amount.
How the accuracy grade would work
CMS proposes that each plan check a sample of its listings. In that sample, 35% would come from mental health and substance use providers, because those listings are wrong more often.
Not every mistake counts the same. Here is the proposed weighting (Federal Register):
| What is checked | Weight |
|---|---|
| Is the doctor really in the network? | 40% |
| Phone and contact details | 20% |
| Office address | 20% |
| Specialty | 10% |
| Disability access | 3.5% |
| Telehealth offered | 3.5% |
| Accepting new patients | 3% |
Scores turn into letter grades: A is 90 to 100, B is 80 to 89, C is 70 to 79, D is 60 to 69, E is 50 to 59, and F is 49 or below.
My take: these grades won’t help you this fall. The first ones show up in plan directories for 2029. For 2027, you still have to check your doctors yourself.
What protects you right now
The 2028 cost protection is not in place yet. But some rules already apply:
- Updates within 30 days. Plans must already update listings within 30 days of learning about a change (Federal Register).
- Notice when a doctor leaves. If your primary care or behavioral health provider leaves the network, the plan must send written notice at least 45 days before and try to call you. For other specialists you see regularly, notice is due at least 30 days before (eCFR 42 CFR 422.111).
- A Special Enrollment Period for big network cuts. If CMS finds a plan made a significant network change and you’re affected, you can switch plans or go back to Original Medicare once. The window starts the month you’re told and lasts 2 more months.
- Plan Finder data got better. On Oct 9, 2026, Medicare Plan Finder switched from outside data to 2027 network data sent by the plans and checked by CMS (CMS).
Watch out for: the special 2026 fix for wrong Plan Finder listings. CMS created a temporary Special Enrollment Period for people who joined a plan through Plan Finder and then found their doctor wasn’t in the network. It covers plans that started Jan 1 to Dec 1, 2026, and you must use it within the first 3 months by calling 1-800-MEDICARE (CMS). CMS says it is for 2026 only. I found no word that it will carry into 2027, so don’t count on it.
How to check your doctors for 2027
- Make a list. Write down every doctor, specialist, hospital and therapist you want to keep. Add the full name and office address.
- Use Plan Finder. On the Medicare Plan Finder, you can enter up to 5 providers and sort plans by whether a “must-have” provider is in network.
- Check the plan’s own directory. Look up the same doctors on the plan’s website. Make sure the listing is for 2027, the same office location, and the exact plan name. One insurer can have many plans with different networks.
- Call the doctor’s office. Ask: “Will you be in network with [plan name and ID] for 2027? Are you taking new patients?” Billing staff know this best.
- Write it down. Note the date, the person you spoke with, and what they said. Take a screenshot of the directory listing too.
- Check your hospital. Ask whether your hospital and its doctors, like anesthesia and imaging, are in network.
Watch out for: a doctor saying “we take Medicare.” That is not the same as being in a Medicare Advantage plan’s network. Ask about the exact plan.
If you mostly want freedom to see any doctor, Original Medicare lets you see any provider in the US that accepts Medicare, with no network (KFF). See our side-by-side guide: Medicare Advantage vs Original Medicare.
If the directory was wrong
- Call the plan first. Ask them to fix the listing and explain your bill. Keep your notes and screenshots.
- File a grievance if they won’t help. You can also call 1-800-MEDICARE (1-800-633-4227, TTY 1-877-486-2048).
- Use the Medicare Advantage Open Enrollment Period. From Jan 1 to March 31, people in a Medicare Advantage plan can make one switch to another plan or to Original Medicare.
- Get free help. Your State Health Insurance Assistance Program (SHIP) gives free, unbiased counseling.
Want to weigh in?
The rule is not final. Anyone can comment until Dec 15, 2026, on Regulations.gov under docket CMS-2026-2533. Your story about a wrong listing is the kind of real example CMS asks for.
The same rule would also cut the generic drug copay from $1 to $0 for full-benefit dual eligibles at or below 100% of the poverty level, starting Jan 1, 2028 (CMS).
More help for this Open Enrollment:
- How to compare 2027 Medicare Advantage plans
- How to find a doctor who takes Medicare
- Open Enrollment mistakes to avoid
- Medicare Advantage enrollment limits for 2027
- Your Medicare Advantage plan is ending for 2027
Common questions
How often do Medicare Advantage plans have to update their provider directories?
Today, plans must update listings within 30 days of learning about a change. Starting in 2028, the new law requires plans to verify each listing at least every 90 days and remove departed providers within 5 business days.
What if my doctor was listed in-network but turned out to be out of network?
Starting in 2028, if the doctor was listed as in-network on the day you made the appointment, you pay no more than in-network cost sharing. Until then, call your plan, keep proof of the listing and file a grievance if needed.
Is the Medicare Plan Finder provider search accurate for 2027?
It should be better than last year. On Oct 9, 2026, Plan Finder switched to 2027 network data sent by the plans and checked by CMS. Still, call your doctor’s office to confirm.
Can I switch plans if my doctor leaves my Medicare Advantage network?
You can switch during Open Enrollment (Oct 15 to Dec 7) or the Medicare Advantage Open Enrollment Period (Jan 1 to March 31). If CMS rules a network change significant, affected members get a Special Enrollment Period.
When will provider directory accuracy grades appear?
Starting in 2029, plans must show their letter grade in their directories and CMS must publish the scores. The details are in a proposed rule open for comment until Dec 15, 2026.
Written by Khasim Basha Shaik. I research Medicare and senior benefits and compare plans for readers. I am not a lawyer, financial adviser or licensed insurance agent. This article summarizes the CMS proposed rule, CMS guidance and federal regulations, and is not advice about a specific plan. Last reviewed October 27, 2026.
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