The Short Version
The Medicare Annual Enrollment Period runs from October 15 through December 7 every year. In that window you can change your Medicare Advantage or Part D plan with no health questions. Whatever you choose takes effect on January 1. If you do nothing, your current plan rolls over with next year's premium, network, and drug list.
Why Does the Enrollment Period Matter?
Plans are approved one year at a time. Every fall, carriers refile premiums, copays, drug lists, and provider networks.
So a plan that fit you well can quietly stop fitting. A drug can move to a higher tier. Your cardiologist can leave the network. The plan can also drop a benefit you had come to use.
The enrollment period is your yearly chance to react. Outside it, you usually need a special reason to switch.
What Are the Key Dates?
- Late September: your plan mails the Annual Notice of Change.
- October 1: next year's plan details become public, so you can start comparing.
- October 15: the Annual Enrollment Period opens.
- December 7: the period closes for most people.
- January 1: your new coverage begins.
- January 1 through March 31: Advantage members get one more chance to change.
Put December 7 in your calendar now. Phone lines and appointment books fill up in the final two weeks.
Your Checklist, Step by Step
- Find your Annual Notice of Change and read it. Compare this year's costs to next year's, line by line.
- Write down every medication. Include the exact name, the dose, and how often you take it.
- List your providers. Primary care, each specialist, your hospital, and your pharmacy.
- Check your plan's network and drug list for next year, not this one.
- Compare the other plans in your county on the same three points: doctors, drugs, and total cost.
- Look at the star rating, which scores member experience and quality of care.
- Enroll before December 7, then save your confirmation number.
Step five is where most savings hide. Two plans can look alike on premium, then differ a lot once your own prescriptions are priced.
What Can You Change in This Window?
- Move from Original Medicare to a Medicare Advantage plan.
- Move from Medicare Advantage back to Original Medicare.
- Switch from one Advantage plan to another.
- Switch from one Part D plan to another.
- Add Part D coverage, or drop it.
Our Annual Enrollment Period guide covers each move in more detail.
What Can You Not Change?
Medigap sits outside this window. A Medigap carrier can ask health questions and turn you down at almost any time of year. The exception is a protected window set by state or federal rules.
You also cannot use this window to undo a late enrollment penalty, or to join a plan outside your county.
If you are thinking about leaving an Advantage plan for Original Medicare and Medigap, raise it early. Underwriting takes time, and protected windows are short. Our page on Medigap trial rights explains when health questions do not apply.
What If You Miss December 7?
You still have options, though fewer.
- Advantage members get one change between January 1 and March 31.
- A move, the loss of a job plan, or new Medi-Cal status can open a Special Enrollment Period.
- If you never signed up for Part B, the General Enrollment Period runs January 1 through March 31.
Call rather than guess. Special windows are short, and most of them need proof of the event.
Mistakes We See Every Fall
- Judging a plan by premium alone, then paying far more at the pharmacy.
- Assuming a doctor is in network because they were last year.
- Dropping drug coverage during a healthy stretch, which invites a penalty later.
- Enrolling in a plan a relative likes, in a county with different options.
Who Should Review No Matter What?
Some situations almost always call for a fresh look:
- Your plan mailed a notice showing a higher premium or a new deductible.
- A drug you take moved to a different tier, or left the list.
- You changed doctors, changed hospitals, or moved to a new county.
- You started dialysis, cancer treatment, or another course of regular care.
- You qualified for Medi-Cal, or for a Medicare Savings Program, during the year.
- You paid more at the pharmacy than you expected this year.
Any one of these can change which plan is the strongest fit. New Medi-Cal status matters most, since it may open a plan built for dual members.
How Do You Make the Review Easy?
Keep one folder. Put your Medicare card, your plan ID card, your notice of change, your drug list, and your provider list in it. Bring that folder to every review.
Set a yearly reminder for the first week of October. Starting early leaves room to ask questions and to call your doctor's office. Our annual review page shows what we look at together.
Working with Our Team
Harmony SoCal Insurance Services is an independent agency in Orange, founded in 2015. We run yearly reviews for neighbors in Orange, Anaheim, Santa Ana, Irvine, Tustin, Costa Mesa, and the rest of Orange County.
A licensed agent prices your own drugs, checks your doctors against each network, and lays the results side by side. We represent many carriers, though not every plan in the area, and benefits change every year. Our help costs you nothing, and we can meet by phone, by video, or in person.
Call (714) 922-0043 well before December 7 to hold a time.