Medicare Advantage

Second-Guessing Your Advantage Plan? You Have Until March 31

Riverside County has 88 Medicare Advantage plans for 2027. Compared with 2026, 17 plans are not coming back, 14 are new, and 52 continuing plans changed in some way you should check before December 7, 20 of them under a new name. This guide covers what those numbers mean for Temecula, not which plan to pick.

TEMECULA, Calif. — If the plan you locked in during fall open enrollment isn't feeling like the right fit now that you've used it a few times, you are not stuck. From January 1 through March 31, people already enrolled in a Medicare Advantage plan get a second chance — called the Medicare Advantage Open Enrollment Period — to make one change. It's a quieter window than the fall rush, but for anyone in Temecula who is surprised by a network gap, a formulary change or a benefit that doesn't match what they expected, it can be the most useful three months on the Medicare calendar.

Who this window is actually for

The Medicare Advantage Open Enrollment Period, often shortened to MA-OEP, is narrower than fall enrollment. It applies to you only if you were already in a Medicare Advantage plan as of January 1. If you are still on Original Medicare (Parts A and B) with or without a standalone Part D drug plan, this window does not give you a new opportunity to jump into Advantage — you'd generally need to wait for the next Annual Enrollment Period or qualify for a Special Enrollment Period.

New to Medicare in early 2027? People in their Initial Enrollment Period have their own timeline and can use MA-OEP shortly after their Advantage coverage begins.

The changes you can make between Jan. 1 and March 31

During MA-OEP, you're allowed one change. The most common moves are:

• Switch from your current Medicare Advantage plan to a different Medicare Advantage plan.
• Drop your Medicare Advantage plan and go back to Original Medicare. If you do this, you can also join a standalone Part D prescription drug plan.

What you cannot do during this window: switch from Original Medicare into an Advantage plan, join or change a standalone Part D plan if you're staying on Advantage without drug coverage, or make multiple changes. Once you use your one switch, the window closes for you until a Special Enrollment Period or the next fall.

What's worth double-checking before you switch

The plan documents you got in the fall — the Annual Notice of Change and Evidence of Coverage — spell out what changed for 2027. A few things trip people up in January:

• Provider network. Confirm your doctors, specialists and preferred hospital are still in-network for the new plan year. Networks can change even if you stay put.
• Drug list (formulary). Medications can move tiers, get added, or drop off. If a prescription you rely on isn't covered the way it used to be, that's a reason to look.
• Referrals and prior authorization. HMO and PPO rules differ, and requirements can shift year to year.
• Extra benefits. Dental, vision, hearing, transportation and over-the-counter allowances vary by plan.

Temecula is in Riverside County, where Medicare beneficiaries have a range of Advantage and Part D options to compare on Medicare.gov's Plan Finder. For 2027, Riverside County has 68 Medicare Advantage plans from 18 carriers. Availability is set at the county level, so what your neighbor across town sees is what you'll see.

2027 rules that affect the decision

A few program-level facts to keep in mind while you weigh a switch:

• Part D out-of-pocket cap: $2,100 in 2026 and $2,400 in 2027. Once your out-of-pocket spending on covered drugs hits that ceiling, you pay nothing for covered prescriptions the rest of the year. This applies whether your Part D coverage is through an Advantage plan or a standalone drug plan.
• Part D maximum deductible: $615 in 2026 and $700 in 2027 (plans can set a lower one).
• No more donut hole. As of 2025, Part D has three phases — deductible, initial coverage, and catastrophic — with no coverage gap.
• Medicare Prescription Payment Plan. If drug costs hit hard in a single month, this optional program lets you spread them across the calendar year in monthly installments instead of paying at the pharmacy counter.
• IRMAA. Higher-income beneficiaries pay income-related surcharges on Part B and Part D. For 2026, these begin above $109,000 in income for a single filer.

How to actually make the switch

You don't cancel your old plan first. When you enroll in a new Medicare Advantage plan, your old one ends automatically on the last day of the month before your new coverage begins. If you're moving back to Original Medicare, you can call 1-800-MEDICARE or use your Medicare.gov account to disenroll, then sign up for a standalone Part D plan in the same call or session.

Changes made in January take effect February 1; February changes start March 1; March changes start April 1.

Where to get unbiased help

Before you switch, it's worth a free call to someone who doesn't earn a commission on your decision:

• Medicare.gov — use the Plan Finder to compare plans available in Riverside County by ZIP code and drug list.
• 1-800-MEDICARE (1-800-633-4227) — available 24/7.
• California's SHIP, called HICAP (Health Insurance Counseling and Advocacy Program) — free one-on-one counseling from trained volunteers with no ties to any insurance company.