Medicare Advantage
Aetna's Medicare Advantage plans in Oakland for 2027: a C-SNP arrives, three plans exit
OAKLAND, Calif. — Fall 2026. Aetna's Medicare Advantage lineup in Alameda County is shifting for the plan year that begins Jan. 1, 2027. The carrier is offering four Medicare Advantage plans in the county next year, down from five this year, and the mix of plan types is changing too. If you live in Oakland and have an Aetna plan now — or you are shopping one for 2027 — this is the window to read your mail, open the Plan Finder, and check that your doctors and prescriptions still line up.
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Key takeaways
- Aetna is offering 4 Medicare Advantage plans in Alameda County for 2027: 3 HMOs and 1 HMO-POS, all with drug coverage.
- Two plans are new for 2027, three 2026 plans are not returning, and one plan has been renamed; your Annual Notice of Change (ANOC) has the specifics.
- One of the new plans is an HMO Chronic Condition Special Needs Plan (C-SNP); Aetna is not offering a D-SNP or I-SNP in the county for 2027.
- The Annual Enrollment Period runs Oct. 15 – Dec. 7, 2026; a change you make in that window takes effect Jan. 1, 2027.
| 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.
MyMedicarePlans.org is an independent consumer site and is not Aetna, CVS Health, or Medicare. Aetna is one of 10 carriers offering Medicare Advantage plans in Alameda County for 2027; together those carriers offer 32 plans.
Which Aetna Medicare Advantage plans are offered in Oakland for 2027?
In Alameda County, which is where Oakland sits, Aetna is offering four Medicare Advantage plans for 2027. By type, that is three HMOs and one HMO-POS, and all four include Part D drug coverage. The table below lists every plan by exact name and type.
The four plans are: Aetna Medicare Chronic Care (HMO C-SNP), Aetna Medicare Eagle (HMO), Aetna Medicare Signature (HMO), and Aetna Medicare Signature Extra (HMO-POS). We are listing them in alphabetical order and are not comparing them. For premiums, copays, deductibles, provider networks, drug formularies, and star ratings, the sources to use are the Medicare Plan Finder at medicare.gov, 1-800-MEDICARE, and each plan's own Evidence of Coverage.
What is new, renamed, or not returning in Aetna's Oakland lineup for 2027?
Compared with 2026, Aetna has two plans new for 2027 in Alameda County, three plans that are not returning, and one plan that has been renamed. The renamed plan is Aetna Medicare Signature Extra, which was listed as an HMO-POS last year under the same name and continues as an HMO-POS for 2027.
The two new-for-2027 plans are Aetna Medicare Chronic Care (HMO C-SNP) and Aetna Medicare Eagle (HMO). Aetna Medicare Signature (HMO) continues from 2026. If you are currently in an Aetna plan that is not on the 2027 list, your Annual Notice of Change (ANOC), mailed in September, explains what is happening to your coverage and the options Aetna is offering you.
Does Aetna offer a Special Needs Plan in Alameda County for 2027?
Yes — one. For 2027, Aetna is offering one Chronic Condition Special Needs Plan (C-SNP) in Alameda County: Aetna Medicare Chronic Care (HMO C-SNP). It is not offering a Dual Eligible Special Needs Plan (D-SNP) or an Institutional Special Needs Plan (I-SNP) in the county next year.
C-SNPs are built for people living with specific chronic conditions, and you have to qualify to enroll. The plan's materials and the Plan Finder spell out which conditions qualify and how enrollment works.
How do I check a plan against my doctors and prescriptions before Dec. 7?
Use the Medicare Plan Finder at medicare.gov. Sign in (or create an account), enter your Oakland ZIP code, and add every prescription you take with its dose and pharmacy. The tool will show each plan's estimated yearly drug cost at your pharmacies, and it links to each plan's provider directory so you can confirm your doctors and preferred hospitals are in network.
Two tips that save headaches: check the pharmacy tier (a drug can be "covered" but cost very differently at a preferred vs. standard pharmacy), and call the doctor's office to confirm they still take the specific plan for 2027, not just "Aetna." If you would rather speak with someone, 1-800-MEDICARE (TTY 1-877-486-2048) is open 24/7.
What are the key 2027 dates and figures for Oakland Medicare shoppers?
The Annual Enrollment Period runs Oct. 15 – Dec. 7, 2026, and any change you make takes effect Jan. 1, 2027. If you do nothing and your current plan is offered next year, it renews automatically with the changes described in your ANOC. Medicare Advantage members also have the Medicare Advantage Open Enrollment Period, Jan. 1 – March 31, 2027, to make one switch.
For Part D in 2027, CMS has confirmed the out-of-pocket cap is $2,400 (up from $2,100 in 2026) and the maximum deductible a plan may charge is $700 (up from $615 in 2026). The Part D national base beneficiary premium for 2027 is $41.33 — that is a formula input, not what any particular plan charges. The 2027 Part B standard premium, deductible, and IRMAA income brackets have not been announced yet; CMS typically publishes those in November.
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.
2027 plan lineup
Aetna Medicare Advantage plans in Alameda County for 2027
CMS lists 4 Aetna Medicare Advantage plans in Alameda County for 2027, alphabetically by carrier. 9 other carriers also offer plans there.
| Plan | Type | Drug coverage | For 2027 |
|---|---|---|---|
| Aetna (CVS Health) 4 plans | |||
| Aetna Medicare Chronic Care (HMO C-SNP) | HMO C-SNP | Yes | New |
| Aetna Medicare Eagle (HMO) | HMO | Yes | New |
| Aetna Medicare Signature (HMO) | HMO | Yes | Returning |
| Aetna Medicare Signature Extra (HMO) | HMO-POS | Yes | Renamed |
Source: CMS Medicare Advantage Landscape Source Files, plan years 2026 and 2027. Plan availability is set at the county level. No plan is ranked or recommended; premiums, benefits, networks and star ratings are not shown. Plan details come from the Medicare Plan Finder at medicare.gov or the plan itself.
The 2027 choices, by type
How Aetna Medicare Advantage plans in Alameda County break down for 2027
HMO plans use a network and usually a primary-care doctor and referrals; HMO-POS plans add some out-of-network coverage; PPO plans also cover out-of-network care, at a higher share; PFFS plans pay any provider that accepts the plan’s terms. Special Needs Plans serve people with Medicare and Medicaid (D-SNP), certain chronic conditions (C-SNP) or living in an institution (I-SNP).
Source: CMS Medicare Advantage Landscape Source Files, plan years 2026 and 2027. Plan availability is set at the county level. No plan is ranked or recommended; premiums, benefits, networks and star ratings are not shown. Plan details come from the Medicare Plan Finder at medicare.gov or the plan itself.
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 PeriodAnyone 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
What happens to my Aetna plan if it is not on the 2027 list?
Do all four of Aetna's 2027 Oakland plans include drug coverage?
I only have Original Medicare — does any of this affect me?
Where can I get help comparing plans without a sales pitch?
- CMS — MA Landscape Source File (plan-level availability by county)
- CMS — MA Landscape Source Files, current and coming plan year (year-over-year comparison)
- CMS — Medicare enrollment periods (medicare.gov)
For personalized answers, contact Medicare.gov or 1-800-MEDICARE.
Also for Oakland
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
- CMS — Medicare Advantage Landscape Source Files (plan years 2026 and 2027): Aetna's plan counts, plan names, plan types, drug coverage, SNP counts, and the new/renamed/not-returning changes for Alameda County, plus the county-wide carrier and plan totals.
- Medicare.gov: the Annual Enrollment Period dates, the Medicare Advantage Open Enrollment Period, and the Plan Finder tool for checking doctors and prescriptions.
- CMS — 2027 Part D parameters: the $2,400 out-of-pocket cap, the $700 maximum deductible, and the $41.33 national base beneficiary premium.
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.