When Maria’s father in Tustin got a letter saying his cardiologist of eleven years was being dropped from his Medicare Advantage network, her first call wasn’t to the insurance company — it was to Google, typing “can I switch Medicare Advantage plans if my doctor leaves the network.” Many families assume the answer is “no, you’re stuck until the next Annual Enrollment Period.” That’s true for some people, but not for anyone who saw that doctor recently: federal rules give them a faster option, and for Orange County seniors navigating a wave of provider network disruptions this fall, knowing that could save months of disrupted care.
Buried in federal Medicare regulations is a special enrollment period built for exactly this situation. It’s narrower than the SEP that applies when an entire plan is discontinued (the kind of non-renewal notice Humana plans begin mailing October 2 for 2027), but it’s real, it’s federally guaranteed, and its eligibility test turns on a few specific words.
The Rule: 42 CFR 422.62(b)(23)
The regulation is short, but the language matters. Here’s the operative text, verbatim from the Code of Federal Regulations:
“Individuals affected by a significant change in plan provider network are eligible for a SEP that permits disenrollment from the MA plan that has changed its network to another MA plan or to original Medicare. This SEP can be used only once per significant change in the provider network.” — 42 CFR 422.62(b)(23)
Read it closely: the trigger is a significant change in the plan provider network. Orange County families dealing with a network disruption right now have a real, usable right under it.
Two Different SEPs — Don’t Confuse Them
Orange County’s Medicare Advantage landscape has two distinct disruptions happening at once, and they trigger two different SEPs. Getting them confused is the single biggest reason families miss their window.
The first is a full plan non-renewal or discontinuation — the kind behind Humana’s 2027 Orange County exits, which we covered in detail in our guide to the 63-day Medigap guaranteed-issue window. That’s governed by 42 CFR 422.62(b)(1): your whole plan is going away, CMS or the carrier notifies you, and you get a broad SEP to pick a new MA plan or return to Original Medicare.
The second — the one this article is about — is narrower and far less publicized. Your plan keeps operating, but a specific doctor, medical group, or facility you rely on is being terminated from that plan’s network. Your coverage doesn’t end. Your relationship with the one provider you actually see does. That’s 42 CFR 422.62(b)(23), and it comes with its own, separate SEP.
| SEP (b)(1) — Plan Leaves | SEP (b)(23) — Doctor Leaves Network | |
|---|---|---|
| What triggers it | CMS or the carrier ends the entire plan or discontinues it in your area | A specific provider or facility is terminated from an otherwise-continuing plan’s network |
| Who is eligible | Every enrollee in the terminated plan | Only enrollees assigned to, currently seeing, or seen within the past 3 months by the terminated provider |
| SEP window | Begins at notice, runs through the plan’s effective termination plus additional time set by CMS | Begins the month you’re notified, extends 2 additional calendar months |
| How many times usable | Once, tied to that plan termination | Once per significant network change |
| Where to go | New MA plan or Original Medicare + Medigap (guaranteed issue may apply) | New MA plan or Original Medicare |
California Update, October 11, 2026: What AB 2613 Changes, and What It Doesn’t
On September 18, 2026, Governor Newsom signed AB 2613 by Assemblymember LaShae Sharp-Collins (Chapter 306, Statutes of 2026). It amends Health and Safety Code section 1373.65, part of the Knox-Keene Act that the California Department of Managed Health Care (DMHC) enforces. The bill has no urgency clause and no special start date, so it takes effect January 1, 2027.
What is not new: California plans were already required to mail you a notice at least 60 days before their contract with your medical group or hospital ends. If you see headlines saying a new law “gives you 60 days,” that part has been on the books for years.
What changes starting January 1, 2027:
- The same 60-day notice must also go out by text message or email, but only if you have opted in to electronic delivery and given the plan your cell number or email address. If you haven’t, you still get paper only.
- If the plan and the doctor or hospital work out a deal after the termination letters go out, the plan has 5 business days to send DMHC a follow-up notice for approval. It must then tell you, by mail and by text or email if you opted in, within 10 business days after approval. If the deal comes before the termination date, that notice tells you you’re still assigned to your provider. If it comes after, the plan has to offer you the option to go back.
Who it does not reach: The bill’s own text says the new provisions do not apply to Medi-Cal managed care plans, so CalOptima Health members should not expect the new text or email notice. The bill also never mentions Medicare. Medicare Advantage plans are regulated by the federal government, and federal law generally overrides state rules for them, so the federal special enrollment period described above is still the tool that matters for Medicare Advantage members.
Who should act now: adult children and family caregivers covered by an employer or Covered California HMO licensed by DMHC. Log in to your plan’s member portal and set your communication preference to text or email before January. Every notice about a contract termination must also tell you how to reach DMHC: 1-888-466-2219 (TDD 1-877-688-9891).
The Eligibility Test, Explained
The regulation doesn’t hand this SEP to every member of a plan just because one doctor somewhere in the network gets dropped. It’s targeted at people who actually relied on that specific provider. The federal text lays out the test in three parts — you qualify if you are:
- Assigned to the provider or facility being terminated (common in HMO structures with a designated primary care provider), or
- Currently receiving care from that provider or facility, or
- Have received care within the past 3 months from that provider or facility before the termination.
That third prong is the one people miss. You don’t have to be mid-treatment when the notice arrives. If you saw that cardiologist for a checkup ten weeks ago and then get a notice that they’re leaving the network, you still qualify under the look-back window.
The plan itself is required to send you a CMS-directed notice once CMS instructs it to, telling you that you’re eligible for this SEP and how to use it. If a network change is genuinely “significant” under CMS’s standard, the notice obligation sits with the plan — not with you to go dig it up. That said, plans do not always get this right the first time, which is exactly why understanding your own eligibility matters even before a notice arrives.
What If You Don’t Qualify?
If you weren’t assigned to the departing doctor, aren’t in active treatment with them, and your last visit was more than three months before the termination, this SEP doesn’t apply to you. In that case the familiar advice is the right one: your next chance to change plans is a regular enrollment window.
- Annual Enrollment Period, October 15 to December 7, 2026. You can switch to a different Medicare Advantage plan or return to Original Medicare, and the change takes effect January 1, 2027. Before you choose, confirm your doctor is in the new plan’s 2027 network. Our guide to reading your 2027 Annual Notice of Change walks through that review.
- Medicare Advantage Open Enrollment Period, January 1 to March 31, 2027. If you’re in a Medicare Advantage plan on January 1, you can make one switch during these three months, either to another Medicare Advantage plan or to Original Medicare with a stand-alone Part D drug plan. The change starts the first day of the following month.
A free HICAP counselor from the Council on Aging – Southern California can check which plans include your doctors: (714) 560-0424. If your whole plan is leaving rather than one doctor, that’s a different and broader SEP, covered in our guide to 2027 non-renewal letters and the guaranteed-issue window.
What “Significant” Means — and Why It’s Worth Asking
CMS doesn’t publish a single bright-line percentage for what counts as a “significant” network change; it evaluates disruption based on the number of enrollees affected, the specialty and availability of alternative in-network providers, and the geographic access those enrollees would lose. In practice, the loss of a hospital system, a large multi-specialty medical group, or a sole community specialty practice is far more likely to trigger the SEP than the departure of a single provider in a specialty with dozens of in-network alternatives nearby.
If your plan quietly drops a provider and never sends a SEP notice, that is not automatically the end of the conversation. You can call the plan directly, describe your relationship with the terminated provider using the three-part test above, and ask in writing whether CMS has determined the change to be significant. You can also call 1-800-MEDICARE and ask a representative to check whether a SEP has been authorized for that network change. Silence from the plan is not the same as ineligibility.
What to Actually Do This Week
If a letter has already landed on the kitchen table, or a provider’s office has told you they’re “going out of network” next year, here’s the sequence that protects the SEP window instead of letting it quietly expire.
Step 1: Read the notice for the eligibility language, not just the bad news
Plan letters about network terminations are often written to satisfy a compliance requirement, not to explain your options clearly. Look specifically for the phrase “special enrollment period” or a reference to “42 CFR 422.62” or “significant network change.” If it’s there, your two-month clock started the month you received the notice — not the month the provider’s contract actually ends.
Step 2: Confirm your own eligibility against the three-part test
Before calling anyone, write down: am I assigned to this provider, am I currently seeing them, or have I seen them in the last three months? Having a clear, factual answer makes every phone call after this one faster and less frustrating.
Step 3: Decide what “better” looks like before you shop
A narrow network SEP doesn’t require you to leave your current plan — it gives you the option to. If the rest of your plan’s network still covers your other specialists, pharmacy, and hospital preferences well, switching plans just to keep one doctor may not be worth losing other coverage you value. This is a genuinely personal calculation, not a default “always switch” situation.
Step 4: If you do switch, verify the new plan actually has your provider — in writing
Provider directories are notoriously unreliable across the industry. Before enrolling anywhere on the strength of “they list Dr. So-and-so as in-network,” call that provider’s office directly and ask them to confirm active participation with that specific plan for the coming year.
Ten Things to Check Before Your SEP Window Closes
Click each item as you complete it. Every item here maps directly back to the eligibility test and window rules above.
Test What You’ve Learned
1. Under 42 CFR 422.62(b)(23), how long does the SEP last after you’re notified of a significant network change?
2. Which of these makes you eligible under the three-part test?
3. What’s the key difference between SEP (b)(1) and SEP (b)(23)?
4. How many times can you use the (b)(23) SEP for the same network change?
5. If your plan never sends a SEP notice but your longtime doctor vanishes from the directory, what should you do?
Frequently Asked Questions
No. This particular SEP is specific to Medicare Advantage plan network changes under 42 CFR 422.62. Original Medicare beneficiaries generally aren’t restricted to a provider network in the same way, so this rule doesn’t apply to them.
Not yet. The SEP is triggered by an actual, CMS-recognized significant network change with a formal notice, not by an ongoing contract negotiation. Ask the practice to tell you clearly once a termination is final, and watch for a formal notice from your plan.
Guaranteed-issue Medigap rights are governed by separate rules and don’t automatically attach to every SEP. If you’re leaving a Medicare Advantage plan because of a full plan non-renewal, see our guide on the 63-day guaranteed-issue window, which is a different (and broader) situation than a single-provider network change.
CMS’s language covers people assigned to, currently under the care of, or seen within the past 3 months by the terminated provider. An annual-visit relationship where your last visit falls outside that 3-month window may not automatically qualify — this is exactly the kind of borderline case worth raising directly with your plan or 1-800-MEDICARE.
CMS makes that determination, weighing factors like the number of enrollees affected and whether comparable in-network alternatives exist nearby. The plan is then required to notify eligible enrollees once CMS has made that call.
We’re a home care staffing agency, not a licensed insurance broker, so we can’t advise on plan selection. What we do help with every day is care continuity — making sure a caregiving schedule, medication routine, or transportation plan doesn’t fall apart while a family sorts out an insurance transition. If that’s the piece you need support with, we’re a call away.
Navigating a Coverage Change Shouldn’t Mean Navigating It Alone
Whether your family is untangling a network change, a full plan non-renewal, or just trying to keep a loved one’s care routine steady through open enrollment season, At Home VA Staffing is here to help coordinate the caregiving side while you sort out the paperwork.
Talk to Our Team: (213) 326-7452This article is for general educational purposes and does not constitute legal, medical, or insurance advice. Medicare rules, SEP eligibility, and CMS network-adequacy determinations can vary by individual circumstance. Always confirm your specific eligibility with your plan, 1-800-MEDICARE, or a licensed insurance counselor such as California’s HICAP program before making enrollment decisions. Regulatory citations were verified against the Electronic Code of Federal Regulations (eCFR) as of September 2026.
