Medicare 2026
Livermore Medicare checklist: what to review and change before the Dec. 7 deadline
LIVERMORE, Calif. — The Medicare Annual Enrollment Period is open through Dec. 7, and anything you change now takes effect Jan. 1, 2027. If you are on Medicare in Livermore, this is the once-a-year window when you can switch how your coverage is set up — not just which plan you have, but what kind of plan it is.
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Key takeaways
- The Annual Enrollment Period runs Oct. 15 through Dec. 7, and your choices take effect Jan. 1, 2027.
- You can switch between Original Medicare and Medicare Advantage, change Advantage plans, or join, drop or change a Part D drug plan.
- Livermore is in Alameda County, where plan availability is set at the county level — compare any plan using your own doctors and prescriptions.
- For 2026, Part D has a $2,100 out-of-pocket cap and a maximum deductible of $615; the Medicare Prescription Payment Plan lets you spread drug costs across the year.

| Fact | Figure | Source |
|---|---|---|
| Medicare Advantage plans offered in Alameda County (2026) | 37 | CMS |
| Medicare Advantage plans offered in Alameda County (2027) | 32 | CMS |
| Plans not returning for 2027 / new for 2027 | 10 / 5 | CMS |
| Organizations offering Medicare Advantage in Alameda County (2026) | 12 | CMS |
| Share of eligible beneficiaries in Medicare Advantage, Alameda County | 53% | CMS |
| Residents age 65 and older, Alameda County | 254,161 | U.S. Census Bureau |
| Part B standard monthly premium (2026) | $202.90 | Medicare.gov |
| Part D out-of-pocket cap (2026) | $2,100 | CMS |
| Part D out-of-pocket cap (2027) | $2,400 | CMS |
| Annual Enrollment Period (for 2027 coverage) | October 15 – December 7, 2026 | Medicare.gov |
| Medicare Advantage Open Enrollment Period | January 1 – March 31 | Medicare.gov |
Area counts are for the county as a whole and are not a recommendation of any plan. Program figures are set nationally.
This fall also brings a notable shift on the drug side: in 2026, Part D out-of-pocket costs are capped at $2,100 for the year, a figure worth keeping in mind as you compare your options for 2027.
What is the Medicare Annual Enrollment Period deadline in Livermore?
The deadline is Dec. 7. The Annual Enrollment Period (AEP) runs Oct. 15 through Dec. 7 every year, and any change you make during that window starts Jan. 1 of the next year — so decisions made this fall shape your 2027 coverage.
If you miss Dec. 7, your current coverage simply rolls into 2027 as-is, with whatever changes your plan has already announced in its Annual Notice of Change.
What can I actually change during AEP in Livermore?
During AEP you can make any of the following changes, and they all take effect Jan. 1, 2027:
- Switch from Original Medicare to a Medicare Advantage plan, or the other way around.
- Switch from one Medicare Advantage plan to another.
- Join a stand-alone Part D prescription drug plan, switch Part D plans, or drop Part D entirely.
One important note: AEP is not the main window for buying or switching a Medigap (Medicare Supplement) policy. Medigap has its own rules, and in California those rules include a yearly "birthday rule" opportunity. If Medigap is on your mind, call 1-800-MEDICARE or check medicare.gov for how and when you can apply.
How should Livermore residents decide what to review?
Start with the Annual Notice of Change (ANOC) your current plan mailed you in late September. That document shows what is changing for 2027 — premium, deductible, drug tiers, provider network, and extras. Even if you like your plan, the plan itself may be different next year.
Then make two short lists before you compare anything:
- The doctors, specialists and hospitals in Livermore and the Tri-Valley you want to keep using.
- Every prescription you take, with the dose and how often you fill it.
With those in hand, the Plan Finder at medicare.gov can show you how each available plan would handle your specific drugs and whether your providers are in-network. Livermore is in Alameda County, and Medicare plan availability is set at the county level, so what you see reflects Alameda County's lineup.
By the numbers
Medicare Part B premium, 2006–2026
The standard monthly Part B premium has climbed from $88.50 in 2006 to $202.90 in 2026. Hover any point for that year’s premium.
Source: CMS. Standard premium shown; in some hold-harmless years many existing enrollees paid less. Confirm at Medicare.gov.
By the numbers
How people get Medicare in Alameda County
(MA penetration in Alameda County)
MA penetration from CMS enrollment data; Medigap share is an estimate. U.S. average is about 54% Medicare Advantage. These are area-level figures, not plan-specific.
What Part D changes should I know about for 2026 and 2027?
For 2026, Part D has a $2,100 annual out-of-pocket cap on covered drugs, and plan deductibles cannot exceed $615. The old "donut hole" coverage gap was eliminated in 2025, so Part D now has three phases instead of four.
You can also opt into the Medicare Prescription Payment Plan, which spreads your out-of-pocket drug costs across monthly bills instead of paying the full amount at the pharmacy counter. It does not lower what you owe; it just smooths out the timing. Any Part D or Medicare Advantage plan with drug coverage must offer it if you ask.
Figures for 2027 are not finalized here, so compare 2027 plans using the details each plan posts during AEP.
What if I have higher income — does IRMAA apply?
If your 2024 income was above $109,000 as a single filer (or above the married-filing-jointly threshold), you may pay an Income-Related Monthly Adjustment Amount, or IRMAA, on top of your Part B and Part D premiums in 2026. Social Security sends a letter if this applies to you. If your income has dropped due to a life event like retirement or the death of a spouse, you can ask Social Security to reconsider.
What happens after December 7 in Livermore?
After Dec. 7, your 2027 coverage is locked in — with one exception. If you end up on a Medicare Advantage plan and change your mind, the Medicare Advantage Open Enrollment Period runs Jan. 1 through March 31, 2027. During that window you can switch to a different Medicare Advantage plan once, or go back to Original Medicare and add a Part D plan. That window is not open to people who stay on Original Medicare.
Key dates
Medicare enrollment periods at a glance
- Around your 65thInitial Enrollment PeriodA 7-month window around the month you turn 65 — your first chance to sign up.
- October 15 – December 7Annual Enrollment Period (Open Enrollment)Anyone with Medicare can join, switch, or drop a Medicare Advantage or Part D plan.
- January 1 – March 31Medicare Advantage Open EnrollmentIf you're already in a Medicare Advantage plan, you can make one change.
- January 1 – March 31General Enrollment PeriodFor people who missed their first chance to sign up for Part B.
- VariesSpecial Enrollment PeriodTriggered by life events like moving or losing other coverage.
Dates are set by Medicare and apply nationwide. Confirm your personal windows at Medicare.gov or 1-800-MEDICARE.
Explore
When can you enroll? An interactive year
Enrollment windows are federal and the same nationwide. Confirm your personal dates at Medicare.gov or 1-800-MEDICARE.
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The parts of Medicare
Good to know
Frequently asked questions
When is the Medicare Annual Enrollment Period deadline?
Do I need to do anything if I like my current plan?
Can I buy or switch a Medigap plan during AEP?
Where can I get personalized help?
- CMS — Medicare enrollment periods (medicare.gov)
For personalized answers, contact Medicare.gov or 1-800-MEDICARE.
Also for Livermore
Sources and methodology
- CMS, Medicare Advantage and Part D Landscape Source Files
- CMS, Medicare Advantage state/county penetration and enrollment files
- U.S. Census Bureau, American Community Survey (table B01001, age 65 and older)
- Medicare.gov, Medicare costs (Part B premium)
- CMS, Medicare prescription drug coverage (Part D) program rules
- CMS, Medicare Advantage and Part D plan-year announcements
- Medicare.gov, enrollment periods and plan rules
Figures cited in this article
- Medicare.gov: Annual Enrollment Period and Medicare Advantage Open Enrollment Period dates, and what changes are allowed during each.
- CMS: 2026 Part D parameters, including the $2,100 out-of-pocket cap and $615 maximum deductible, and the Medicare Prescription Payment Plan.
- Social Security Administration: IRMAA income thresholds and the process for requesting a reconsideration.
How we put this together: area counts come from the CMS files listed above for the county that contains this city, program figures come from CMS, Medicare.gov and the Social Security Administration, and no plan is ranked or recommended.
By The Medicare Desk · Published . For personalized answers, contact Medicare.gov or 1-800-MEDICARE.
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This page was last updated: October 2026.