Your 2027 Annual Notice of Change Is Coming: What California Medicare Members Should Check

If you are enrolled in a Medicare Advantage or Part D plan, one of the most important pieces of mail you will get all year is about to arrive. It is not a bill and it is not an advertisement. It is the Annual Notice of Change, and it is the only document that tells you, in your plan’s own words, what is changing on January 1.

Plans are required to deliver the ANOC for the coming year by September 30. Most people skim it and set it aside. That is understandable—it is long, it is dense, and nothing appears to require action. But the ANOC is the one chance to see next year’s plan before the window to switch opens on October 15.

This article is general educational information for California Medicare members. It is not medical, legal, tax, or enrollment advice, and it does not describe any specific plan. Always confirm details against your own plan documents.

The dates that matter

What happens	When
Plans must deliver your Annual Notice of Change	By September 30
Medicare Annual Enrollment Period opens	October 15
Annual Enrollment Period closes	December 7
Coverage changes take effect	January 1
Medicare Advantage Open Enrollment Period	January 1 – March 31

The gap between the ANOC arriving and enrollment opening is deliberate. It exists so you have two weeks to read the document and prepare questions before you can act on it. Use it.

What the ANOC actually is

The ANOC is a year-over-year comparison. For each part of your coverage, it shows what you have in the current year next to what you will have next year. Your plan also sends an Evidence of Coverage, which is the full contract; the ANOC is the summary of what moved.

Three things it is not:

• It is not a bill. No payment is due because you received it.
• It is not a notice that you must switch. Most plans continue.
• It is not optional reading if you plan to stay. Staying enrolled is a decision too, and the ANOC is the information you would be deciding with.

Six things to compare, in order

Work through the two columns—this year against next year—and look for movement in these six places. They are ordered by how much disruption a change tends to cause, not by how prominently the plan presents them.

1. Your doctors, medical group, and hospital

This is the change that disrupts care the most and gets read the least. Provider networks are renegotiated every year. A plan can keep the same name, the same premium, and the same benefits while your medical group leaves the network.

In California this matters more than in most states, because many Medicare Advantage plans route care through a contracted medical group or IPA rather than the health plan directly. You can remain in-network with the plan and still lose your physician if the medical group’s contract changes.

Do not rely on the ANOC alone here. Confirm your specific doctors, medical group, and hospital for next year, and confirm them for the exact plan you would be enrolled in.

2. Your prescriptions

Check each medication you take by name against next year’s formulary, and check three things for each one: whether it is still covered, what tier it sits on, and whether your pharmacy is still preferred.

A drug moving up one tier can change your annual cost meaningfully even when the plan’s premium has not moved at all. New utilization rules—prior authorization, step therapy, quantity limits—can also apply to a medication that had none this year.

Our Medicare drug plan guide explains why this review has to be tied to a specific plan, a specific pharmacy, and a specific plan year.

3. Maximum out-of-pocket and cost sharing

The maximum out-of-pocket is the ceiling on what you could spend in a bad year. Look at whether it moved, and look at the copays and coinsurance behind it—specialist visits, inpatient stays, imaging, outpatient surgery, skilled nursing.

Premiums are the number people compare because they are easy to compare. Cost sharing is what you actually pay when you need care.

4. Is the plan still offered where you live?

Plans enter and exit counties. If yours is not being offered in your county next year, the ANOC will say so, and that is the one situation where doing nothing has a real consequence. See the section below.

5. Extra benefits and their limits

Dental, vision, hearing, over-the-counter allowances, transportation, and fitness benefits change often, and the headline figure is rarely the whole story. An allowance can go up while the list of what it covers narrows, or the cap can shift from annual to quarterly. Read the limits, not the number.

6. Premium and deductible

Listed last on purpose. It is the number that draws the eye and it is usually the least disruptive of the six. A premium that rises a few dollars while your doctors, medications, and cost sharing all stay put is often a better outcome than a premium that drops while your medical group leaves the network.

A plan can change a lot without changing its premium

The most common mistake we see is reading only the premium line, seeing no change, and setting the letter down. Your plan can hold its premium at exactly the same figure and still:

• drop your medical group from the network
• move one of your medications to a higher tier
• add prior authorization to a drug that did not require it
• raise the specialist copay or the inpatient daily rate
• narrow what the dental allowance covers

None of those show up in the premium. All of them show up in what you pay and where you can be seen.

If your plan is being discontinued

If your plan is leaving your county or ending entirely, you will have a Special Enrollment Period, and you have more options than the Annual Enrollment Period alone would give you.

This is also one of the specific situations in which California’s Medicare Supplement protections may apply. California has guaranteed-issue rights beyond the federal minimums, including the annual birthday rule that lets many Medigap enrollees change policies without new medical underwriting. The rules are situation-specific and the timelines are short. Our guide to California Medigap rights covers what applies and when.

If a discontinuation notice applies to you, start early. Do not wait for December.

Still working past 65?

If you are 65 or older and still covered by an employer plan, the ANOC is only half your comparison. You are weighing next year’s Medicare plan against next year’s employer plan, and those two renewals do not arrive on the same schedule.

Employer size changes which coverage pays first, and that affects whether delaying Part B is reasonable or expensive. Our Medicare and employer coverage guide covers the individual side. If you are the employer running the group plan, how Medicare coordinates with employer coverage covers your obligations.

What to do after you read it

1. Keep the letter. Put it with your plan card and your medication list.
2. Write down every change that touches your doctors, your prescriptions, or your out-of-pocket costs.
3. Verify independently. Confirm doctors and medications against next year’s plan materials for your ZIP code, not this year’s directory.
4. Compare before October 15, so enrollment is a decision you are executing rather than research you are starting.
5. Ask about anything ambiguous. If a benefit’s limits are unclear in the ANOC, they will be spelled out in the Evidence of Coverage.

You can compare plans yourself at Medicare.gov, call 1-800-MEDICARE, or get free unbiased counseling from California’s HICAP program. Our page on comparing Medicare plans walks through the official tools.

If you do nothing

In most cases you stay enrolled and next year’s terms apply automatically on January 1. That is a legitimate choice when you have read the ANOC and the changes work for you.

It is a poor outcome when the changes did not work for you and nobody read them. If you are in a Medicare Advantage plan and realize in January that the fit is wrong, the Medicare Advantage Open Enrollment Period from January 1 to March 31 gives you one more chance to change—but the options then are narrower than in the fall, and any care you receive in the meantime is under the new terms.

Frequently asked questions

When exactly does the Annual Notice of Change arrive?
Plans must deliver it by September 30 each year for the following plan year. Delivery may be by mail or electronically, depending on how you have chosen to receive plan communications.

I did not get one. What should I do?
Contact your plan directly and ask for a copy. A missing ANOC does not delay any deadline, so do not wait for it to arrive before comparing.

Is the ANOC the same as the Evidence of Coverage?
No. The ANOC summarizes what is changing between this year and next. The Evidence of Coverage is the complete description of what the plan covers and the rules it operates under. When the two seem to disagree, the Evidence of Coverage is the governing document.

My premium did not change. Do I still need to read it?
Yes. Networks, drug tiers, prior authorization rules, copays, and supplemental benefit limits can all change while the premium stays flat.

Does an ANOC apply to Medicare Supplement plans?
The ANOC is a Medicare Advantage and Part D document. Medicare Supplement policies are standardized and do not change benefits year to year, though premiums can change. If you have a Medigap policy plus a standalone Part D plan, expect an ANOC for the Part D plan.

My doctor is leaving the network. Can I switch outside of Annual Enrollment?
A provider leaving a network does not by itself create a Special Enrollment Period in most cases. Some situations do qualify. Confirm your circumstances rather than assuming either way.

What if my plan is not offered next year?
You will receive a non-renewal notice and qualify for a Special Enrollment Period. You may also have guaranteed-issue Medicare Supplement rights. Act early—the timelines are shorter than the Annual Enrollment Period.

Can I change my mind after December 7?
If you are in a Medicare Advantage plan, the Medicare Advantage Open Enrollment Period from January 1 to March 31 allows one change. Standalone Part D enrollees generally cannot switch in that window without a qualifying Special Enrollment Period.

Getting help

Skyline Benefit is an independent California health insurance agency. We can help you organize what changed in your ANOC and what to verify before Annual Enrollment. We do not charge for that conversation.

Start with the Medicare overview or read about Medicare enrollment periods if you are unsure which window applies to you.

This article is general educational information and is not medical, legal, tax, or enrollment advice. It does not describe the benefits of any specific plan. Coverage, networks, formularies, and costs vary by plan, county, and plan year. Confirm all details against your own plan documents and with your plan before making an enrollment decision.