Top-Rated Medicare Advantage Plans in San Mateo (San Mateo County) for 2027
Kaiser Permanente, SCAN Health Plan and Imperial Health Plan of California, Inc. have 2027 plans in San Mateo County rated 4 stars or higher by Medicare in the 2027 CMS Star Ratings.
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2027 CMS Star Ratings
Top-rated Medicare Advantage plans in San Mateo County (2027 CMS Star Ratings)
Of the 26 Medicare Advantage plans offered in San Mateo County for 2027, 0 are rated 5 stars, 3 are rated 4.5 stars and 10 are rated 4 stars in the 2027 CMS Star Ratings. 2 plans have no 2027 star score: CMS lists 2 “Not enough data available”.
San Mateo County includes San Mateo, Daly City and Redwood City. Plans are approved for the whole county, so the same plans are offered in each of them.
| Plan | Insurer | Plan type | 2027 overall rating |
|---|---|---|---|
| Kaiser Permanente Dual Complete North P22 (HMO D-SNP) | Kaiser Permanente | HMO D-SNP | 4.5 out of 5 |
| Kaiser Permanente Senior Advantage Basic San Mateo (HMO) | Kaiser Permanente | HMO | 4.5 out of 5 |
| Kaiser Permanente Sr Adv Enhanced Marin San Mateo (HMO) | Kaiser Permanente | HMO | 4.5 out of 5 |
| Blue Shield Inspire (HMO) | Blue Shield of California | HMO | 4 out of 5 |
| Imperial Dynamic Plan (HMO) | Imperial Health Plan of California, Inc. | HMO | 4 out of 5 |
| Imperial Flex (HMO C-SNP) | Imperial Health Plan of California, Inc. | HMO C-SNP | 4 out of 5 |
| Imperial Senior Value (HMO C-SNP) | Imperial Health Plan of California, Inc. | HMO C-SNP | 4 out of 5 |
| SCAN Allied (HMO) | SCAN Health Plan | HMO | 4 out of 5 |
| SCAN Balance (HMO C-SNP) | SCAN Health Plan | HMO C-SNP | 4 out of 5 |
| SCAN Classic (HMO) | SCAN Health Plan | HMO | 4 out of 5 |
| SCAN Costco Medicare Advantage (HMO) | SCAN Health Plan | HMO | 4 out of 5 |
| SCAN Strive (HMO C-SNP) | SCAN Health Plan | HMO C-SNP | 4 out of 5 |
| Sutter Senior Advantage, a SCAN Medicare Plan (HMO) | SCAN Health Plan | HMO | 4 out of 5 |
| Alignment Health Honor Plus 060 (HMO) | Alignment Health Plan | HMO | 3.5 out of 5 |
| Alignment Health Sutter Advantage +More (HMO) | Alignment Health Plan | HMO | 3.5 out of 5 |
| Anthem Medicare Advantage (HMO-POS) | Elevance Health (Anthem) | HMO-POS | 3.5 out of 5 |
| Central Health Harmony 031 (HMO) | Alignment Health Plan | HMO | 3.5 out of 5 |
| Imperial Courage Plan (HMO) | Imperial Health Plan of California, Inc. | HMO | 3.5 out of 5 (health plan rating) |
| Aetna Medicare Eagle (HMO) | Aetna (CVS Health) | HMO | 3 out of 5 (health plan rating) |
| Aetna Medicare Signature Extra (HMO) | Aetna (CVS Health) | HMO | 3 out of 5 |
| Anthem Prime (HMO-POS) | Elevance Health (Anthem) | HMO-POS | 3 out of 5 |
| CareAdvantage (HMO D-SNP) | HEALTH PLAN OF SAN MATEO | HMO D-SNP | 3 out of 5 |
| CCHP Senior Program (HMO) | CCHP (Chinese Community Health Plan) | HMO | 3 out of 5 |
| CCHP Senior Value Program (HMO) | CCHP (Chinese Community Health Plan) | HMO | 3 out of 5 |
| Premier Care (HMO I-SNP) | Align Senior Care | HMO I-SNP | Not enough data available |
| Senior Care (HMO I-SNP) | Align Senior Care | HMO I-SNP | Not enough data available |
A plan without Part D drug coverage has no overall rating; its Part C summary rating (health plan rating) is shown instead, as CMS does.
Compare plans for your ZIP code in Medicare's Plan Finder on Medicare.gov.
What Medicare Star Ratings measure
CMS rates every Medicare Advantage contract from 1 to 5 stars each year. For 2027, the health plan (Part C) rating looks at five areas: staying healthy (screenings, tests and vaccines), managing chronic (long-term) conditions, members' experience with the plan, member complaints and changes in the plan's performance, and the plan's customer service. A plan with drug coverage is also rated on four drug plan (Part D) areas: customer service, member complaints and changes in performance, members' experience, and drug safety and accuracy of drug pricing.
The scores come from member surveys, information plans and providers report, and Medicare's own data such as complaints and appeals. The overall rating combines the health and drug plan measures; a plan without drug coverage has a Part C summary rating instead. Ratings are given per contract, so every plan under the same contract carries the same stars.
The 5-star Special Enrollment Period
Medicare's 5-star Special Enrollment Period lets you switch, once, to a plan with a 5-star overall rating that is offered where you live, outside the usual enrollment periods. For plans rated 5 stars for 2027, it runs from December 8, 2026 through November 30, 2027.
In San Mateo County, no plan has a 5-star overall rating for 2027, so this window does not apply here; the Annual Enrollment Period, October 15 through December 7, does.
If you switch from a plan with drug coverage to a 5-star plan without it, you could lose your drug coverage, so check before you switch.
Every year, Medicare evaluates plans based on a 5-star rating system.
These ratings are CMS's, not ours, and we do not recommend plans. A rating does not tell you whether a plan covers your doctors and drugs or what it charges.
Source: CMS 2027 Star Ratings Data Tables (Summary Ratings), released October 8, 2026; plans offered: CMS CY2027 Medicare Advantage Landscape file.
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