Every fall, the Medicare Advantage plans available across Southern California update their premiums, deductibles, provider networks, and extra benefits for the coming year. For 2026, those adjustments arrive alongside CMS regulatory changes affecting how plans calculate your maximum out-of-pocket cost and how clearly they must disclose supplemental benefits. None of this applies uniformly across every plan: each insurer sets its own numbers, and the only reliable way to know what is changing in your coverage is to review the notice your plan sends you, not a general industry average. This guide walks through what commonly changes, how to read that notice, and what to do before this fall's enrollment window closes.
Premiums, deductibles, and the out-of-pocket limit
Many Medicare Advantage plans in Southern California keep a $0 monthly premium, but that does not mean the plan's total cost stays the same. The medical or drug deductible, specialist copays, and especially the maximum out-of-pocket limit (MOOP) can rise from one year to the next even when the premium does not change. CMS adjusts the maximum allowed MOOP each year, and some plans set theirs right at that ceiling, while others offer a lower limit as part of their competitive strategy.
If you manage chronic conditions or expect surgery or costly treatment in 2026, the MOOP matters as much as the monthly premium: it is the real ceiling on what you would pay in a year of heavy medical service use.
Provider network changes
Insurers renegotiate their contracts with hospitals, medical groups, and health systems every year, and those negotiations can drop or add specific facilities from a plan's network without any prominent notice beyond the ANOC. A hospital or medical group that was in-network this year may not be for 2026, and vice versa. This is particularly relevant in parts of Southern California where several large hospital systems compete close to each other, such as the South Bay, the San Gabriel Valley, or eastern Los Angeles County.
Before assuming your doctor is still covered, confirm their network status directly with the plan for 2026, especially if you live near more than one major hospital system.
Supplemental benefits: dental, vision, and hearing
Dental, vision, and hearing benefits are extra on top of what Original Medicare covers, and each insurer sets their scope independently. For 2026, some plans are raising their annual dental coverage limit or adding flex benefit cards for over-the-counter expenses, while others are trimming hearing aid coverage or narrowing their dental provider network. These adjustments are almost never announced prominently, so the only reliable way to learn about them is reading the corresponding ANOC section line by line.
CMS regulatory changes relevant for 2026
Beyond the adjustments each insurer decides on its own, CMS updates its own rules each year for how Medicare Advantage plans must calculate out-of-pocket spending, disclose supplemental benefits, and present marketing information. These rules aim to make plan comparisons more transparent, but they also mean the way a plan presents its numbers for 2026 can look different from how it presented them last year, even when the actual coverage changes little. It is worth reading the ANOC without assuming a different format automatically means a major change, or the opposite.
Availability, cost, benefits, and eligibility vary by person, product, contract, and insurance company, as well as by your service area. Guarantees are subject to the claims-paying ability of the issuing insurance company. Karla Arámburo is not affiliated with or endorsed by Medicare or the federal government.
How to read your Annual Notice of Change (ANOC)
Your current plan must send you the ANOC by September 30 each year, summarizing what is changing for the coming year compared to what you have today. It is shorter than the full Evidence of Coverage and is organized so you can compare directly: premium, deductibles, copays by service type, out-of-pocket limit, network changes, and adjustments to supplemental benefits. Pay special attention to the drug section if you take maintenance prescriptions, since the formulary and cost-sharing tiers can change even when the rest of the plan stays similar.
If you did not receive your ANOC or cannot find it, you can request it directly from your insurer or review it in the plan's member portal.
The Fall Annual Enrollment Period (AEP): October 15 – December 7, 2025
AEP is the one annual window open to all Medicare beneficiaries to review and change their coverage for 2026. From October 15 through December 7, 2025, you can switch from Original Medicare to an Advantage plan, move back to Original Medicare, change from one Advantage plan to another, or join, drop, or switch a Part D drug plan. Any change made within this window takes effect January 1, 2026, regardless of which day in the period you made it.
For more detail on this and the other enrollment windows during the year, see our 2026 Medicare enrollment dates guide.
When it makes sense to compare plans with an agent
A comparison with an agent makes the most sense as soon as you receive your ANOC, not in the final days of AEP. If the notice mentions changes to your deductible, network, or medications, or if you simply are not sure what the numbers mean, reviewing your options early avoids rushed decisions before December 7. It is also worth comparing if you moved within Southern California this year, if a doctor or specialist you use left your current network, or if your medication needs changed.
You can see examples of how these changes play out in specific parts of Southern California on our local pages for Torrance and Whittier, and compare the differences between plan types in our HMO vs. PPO guide.
A bilingual, local resource in Southern California
Karla Arámburo is a bilingual, licensed insurance agent serving Southern California, and reviewing your ANOC and your 2026 options with her costs nothing and comes with no pressure. Beyond Medicare, she also works with life insurance options that accept an ITIN for families that do not have a Social Security number. You can call or text (619) 321-8733 before AEP closes on December 7, 2025. This page is general education, not individualized advice or an enrollment recommendation.
Frequently asked questions
When do I need to enroll for a plan change to take effect in 2026?
During the Fall Annual Enrollment Period (AEP), from October 15 through December 7, 2025. Any change you make within that window takes effect January 1, 2026, regardless of which day in the period you made it.
Are all plans getting more expensive for 2026?
Not uniformly. Some plans lower their premium or keep it at $0 per month, while others raise deductibles, copays, or the maximum out-of-pocket limit. The only document that tells you whether your specific plan changed is the ANOC your insurer sends you, not a general market average.
What is the ANOC and how is it different from the Evidence of Coverage?
The ANOC (Annual Notice of Change) summarizes what is changing in your plan for the coming year compared to what you have now: premiums, deductibles, copays, network, and extra benefits. The Evidence of Coverage (EOC) is the full document with every plan detail for the new year. The ANOC is the summary worth reading first.
Can my doctor or hospital leave my plan's network even if I don't change anything?
Yes. Insurers and health systems renegotiate contracts every year, and a doctor or hospital can leave a Medicare Advantage plan's network from one year to the next without you doing anything. That is why it is worth confirming your specific network status in the ANOC or directly with the plan before January 1, rather than assuming nothing changed.
Do dental, vision, and hearing benefits stay the same every year?
Not always. These supplemental benefits are extra on top of Original Medicare, and each insurer decides their scope year by year. A plan might raise its annual dental limit, add a flex benefits card, or reduce hearing aid coverage, and those changes show up in the ANOC.
What happens if my current plan is discontinued or no longer offered in my area for 2026?
If your insurer withdraws a plan from your ZIP code, you will receive a non-renewal notice before AEP, and you typically qualify for a Special Enrollment Period to choose a new plan, even outside the normal AEP dates. You will not be left without coverage, but you do need to act.
Is it worth comparing plans if I'm happy with my current one?
Yes. Even a plan you like can change its network, drug formulary, or copays for 2026. A short annual review confirms your current plan is still the best fit, or shows you whether another plan now available in your ZIP code fits you better.