Medicare Advantage

Medicare in Mesa: 2027 Deadlines & 79 Plan Choices

People in Mesa can choose from 92 Medicare Advantage plans for 2027, against 88 this year. 13 of this year’s plans are gone, 17 are new to Maricopa County, and 33 that continue have changed their premium, deductible, plan type or name, 13 of them under a new name.

MESA, Ariz. — If you live in Mesa, your Medicare choices for 2027 are wide — and the calendar matters as much as the count. Mesa is in Maricopa County, where 79 Medicare Advantage plans are on offer from 16 carriers for 2027, according to the CMS Medicare Plan Finder. But whether you can pick from all 79, switch later, or get locked out for the year comes down to which enrollment window you are in.

Here is how the timing works, in plain terms.

The window most Mesa readers are in right now: AEP

The Annual Enrollment Period (AEP) runs October 15 through December 7 every year. This is the big one. During AEP you can:

• Join, switch, or drop a Medicare Advantage plan.
• Join, switch, or drop a stand-alone Part D drug plan (where available).
• Move between Original Medicare and Medicare Advantage.

Whatever you choose during AEP takes effect January 1, 2027. If you do nothing, your current coverage generally rolls over — but the plan itself may have changed. Every fall, plans send an Annual Notice of Change (ANOC). Read it before Dec. 7, because after that date, most people cannot make another change until the next window opens.

The second-chance window: Medicare Advantage Open Enrollment

If you are enrolled in a Medicare Advantage plan on January 1, you get one more shot. The Medicare Advantage Open Enrollment Period (MA OEP) runs January 1 through March 31. During MA OEP you can:

• Switch from one Medicare Advantage plan to another.
• Drop Medicare Advantage and return to Original Medicare (and add a stand-alone Part D plan if you need drug coverage).

You can only use MA OEP once per year, and it is only for people already in a Medicare Advantage plan on Jan. 1. If you are on Original Medicare on Jan. 1, this window does not apply to you.

Turning 65 in Mesa? Your clock is personal

If you are newly eligible, you have your own Initial Enrollment Period (IEP) — a seven-month window around your 65th birthday month (the three months before, your birth month, and the three months after). This is when you first sign up for Part A, Part B, and either a Part D plan or a Medicare Advantage plan.

Missing your IEP without qualifying coverage from an employer can trigger:

• A Part B late enrollment penalty — an added 10% to your Part B premium for each full 12-month period you could have had Part B but didn't. This penalty usually lasts as long as you have Part B.
• A Part D late enrollment penalty — 1% of the national base beneficiary premium times the number of months you went without creditable drug coverage, also added for as long as you have Part D.

These are not one-time charges. They ride along with your monthly premium.

Special windows that can reopen your options

Life events can trigger a Special Enrollment Period (SEP). Common ones for Mesa readers include moving out of your plan's service area, losing employer coverage, qualifying for Extra Help or Medicaid, or your plan leaving the market. SEPs usually give you a set number of days — often 60 — to act.

There is also a monthly SEP for people with Extra Help (the low-income subsidy) and for those enrolled in a State Pharmaceutical Assistance Program, letting them change Part D or Medicare Advantage prescription drug plans once per calendar quarter during the first nine months of the year.

How the 2027 dates interact

A few timing points worth marking on the calendar:

• Oct. 15, 2026 — AEP opens. You can compare 2027 plans on Medicare.gov.
• Dec. 7, 2026 — AEP closes. Last day for most people to lock in 2027 coverage.
• Jan. 1, 2027 — 2027 coverage begins. MA OEP opens for those in Medicare Advantage.
• March 31, 2027 — MA OEP closes.
• Throughout 2027 — The Part D out-of-pocket cap is $2,400, and the Part D deductible is capped at $700. The coverage gap is gone; Part D now has three phases.

If your income is above $109,000 (single filer, 2026), an IRMAA surcharge may be added to your Part B and Part D premiums.

How to decide — without getting overwhelmed by 88 options

With 88 Medicare Advantage plans in Maricopa County, no one expects you to read all of them. A workable approach:

1. Start with your doctors and prescriptions. Use the Plan Finder at Medicare.gov to filter plans that cover both. 2. Look at total cost, not just premium. Deductibles, copays, and the Part D cap all matter. 3. Check the Medicare Prescription Payment Plan. This optional program lets you spread drug costs across the year instead of paying big bills at the pharmacy counter. 4. Ask for help before Dec. 7. Arizona's SHIP program (called SHIP/SMP Arizona) offers free, unbiased counseling.