2026 Medicare Advantage Plans in San Mateo County, CA
Last update: . Enrollment data updated: June 13, 2026
For 2026, San Mateo County, CA includes 22 Medicare Advantage plans. Enrollment across these plans totals approximately 38,042, with 15 $0 premium options and 57% rated 4 stars or higher.
This page and its statistics exclude Medicare Advantage Special Needs Plans (SNPs). Special Needs Plans in San Mateo County, CA are summarized separately. Visit Medicare Options in San Mateo County, CA to see more options.
Medicare Advantage PPO Plans
Preferred Provider Organization (PPO) plans allow members to choose care from both in-network and out-of-network providers. Out-of-network care usually costs more, but PPOs offer greater flexibility in how members access care.
- Total PPO Plans
- 3
- Average Monthly Premium
- $103.33/mo
- Total PPO Enrollment
- 1,203
- $0 Premium PPO Plans
- 1
- Average MOOP
- $5,283
- Top PPO by Enrollment
- Alignment Health My Choice (PPO) — 1,022 enrollees
- PPO Plans Without Drug Coverage
- 1
| Plan Name | CMS Stars* | Premium/Mo | MOOP | Rx Ded. | CMS ID |
|---|---|---|---|---|---|
| Aetna Medicare Eagle | $0 | $6,750 | N/A | H5521-369-0 | |
| Aetna Medicare Enhanced | $204 | $4,900 | $615 | H5521-676-0 | |
| Alignment Health My Choice | $106 | $4,200 | $0 | H4961-003-0 |
- What is the average monthly premium for PPO plans in San Mateo?
- PPO plans in San Mateo cost $103.33 per month on average.
- Which PPO plan has the highest enrollment in San Mateo?
- The most popular PPO plan in San Mateo is Alignment Health My Choice (PPO), with 1,022 enrollees.
- How many PPO plans in San Mateo do not include prescription drug coverage?
- 1 PPO plans in San Mateo do not include prescription drug coverage.
Medicare Advantage HMO Plans
Health Maintenance Organization (HMO) plans are built around a defined network of doctors and hospitals. Care is generally covered only within the network, except in emergencies, but this structure often results in lower premiums and out-of-pocket costs.
| Plan Name | CMS Stars* | Premium/Mo | MOOP | Rx Ded. | CMS ID |
|---|---|---|---|---|---|
| Kaiser Permanente Senior Advantage Basic San Mateo | $15 | $6,000 | $0 | H0524-065-0 | |
| Kaiser Permanente Sr Adv Enhanced Marin San Mateo | $89 | $3,900 | $0 | H0524-031-0 | |
| Alignment Health Harmony | $0 | $3,400 | $0 | H3815-031-0 | |
| Alignment Health Honor+ Plan | $0 | $9,250 | $615 | H3815-052-0 | |
| Alignment Health Sutter Advantage +More | $48 | $4,900 | $0 | H3815-023-0 | |
| Blue Shield Inspire | $56 | $4,500 | $425 | H0504-041-0 | |
| SCAN Allied | $0 | $1,999 | $250 | H5425-118-0 | |
| SCAN Classic | $0 | $1,500 | $250 | H5425-075-0 | |
| SCAN MyChoice | $0 | $1,999 | $250 | H5425-110-0 | |
| Imperial Courage Plan | $0 | $2,999 | N/A | H5496-016-0 | |
| Imperial Dynamic Plan | $0 | $296 | $0 | H5496-012-0 | |
| CCHP Senior Program | $21 | $3,000 | $0 | H0571-001-0 | |
| CCHP Senior Value Program | $0 | $3,500 | $0 | H0571-007-0 | |
| Central Health Classic Care Plan IV | $0 | $2,499 | $100 | H5649-018-0 | |
| Central Health Valor Care Plan | $0 | $4,400 | N/A | H5649-030-0 | |
| Advantage Care | $0 | $1,900 | $0 | H3274-005-0 |
What is the total number of HMO plans offered in San Mateo?
There are 16 HMO plans in 2026, covering 34,844 enrollees.
How much do HMO plans cost in San Mateo?
The average HMO premium in San Mateo is $14.31 per month, with 11 plans offering $0 premiums.
What is the top HMO by enrollment in San Mateo?
Kaiser Permanente Sr Adv Enhanced Marin San Mateo (HMO) is the top HMO in San Mateo, with 19,171 enrollees.
What is the number of HMO plans without Part D coverage in San Mateo?
2 HMO plans in San Mateo do not include prescription drug coverage.
Medicare Advantage HMO-POS Plans
HMO-POS plans are structured like HMOs, requiring in-network care for the lowest costs, while allowing limited out-of-network access at higher cost. This provides added flexibility compared with standard HMO plans.
- Total HMO-POS Plans
- 3
- Average Monthly Premium
- $0.00/mo
- Total HMO-POS Enrollment
- 1,995
- $0 Premium HMO-POS Plans
- 3
- Average MOOP
- $3,233
- Top HMO-POS by Enrollment
- Anthem Prime (HMO-POS) — 1,124 enrollees
- HMO-POS Plans Without Drug Coverage
- 0
| Plan Name | CMS Stars* | Premium/Mo | MOOP | Rx Ded. | CMS ID |
|---|---|---|---|---|---|
| Aetna Medicare Signature Extra | $0 | $3,600 | $300 | H0523-070-0 | |
| Anthem Medicare Advantage | $0 | $4,900 | $0 | H0544-096-0 | |
| Anthem Prime | $0 | $1,200 | $110 | H4161-005-0 |
What is the average monthly premium for HMO-POS plans?
HMO-POS plans in San Mateo cost $0.00 per month on average.
Which HMO-POS plan is most popular in San Mateo?
The most popular HMO-POS plan in San Mateo is Anthem Prime (HMO-POS), with 1,124 enrollees.
How many HMO-POS plans in San Mateo do not include drug coverage?
There are 0 HMO-POS plans in San Mateo without prescription drug coverage.
CMS quality ratings for Medicare Advantage plans in San Mateo County, CA (2026) are summarized below.
| Rating Category | Number of Plans | Percent of Plans |
|---|---|---|
| 5 Stars | No 5-star plans available. | 0% |
| 4 Stars (includes 5 Stars) | 12 | 57% |
| 3 Stars | 9 | 43% |
| Below 3 Stars | 0 | 0% |
| Not Rated | 1 | 5% |
| Average Rating | 3.71 | |
* CMS assigns Medicare Advantage star ratings annually based on plan quality and performance measures.
- CMS.gov, Medicare Advantage Landscape Source Files — Last accessed June 13, 2026
- CMS.gov, Medicare Part C & D Performance Data — Last accessed June 13, 2026
- CMS.gov, Medicare Advantage & Part D Contract and Enrollment Data — Last accessed June 13, 2026
All plan counts, enrollment totals, averages, and percentage distributions are calculated at the county level using CMS data and include standard Medicare Advantage (MA/MAPD) plans only, based on a consistent aggregation methodology.
Data sources and methodology documentation .
- Medicare.gov, "Understanding Medicare Advantage Plans" — Last accessed 25 May, 2025
- Medicare.gov, "Compare Original Medicare & Medicare Advantage" — Last accessed 25 May, 2025
- NCOA.org, "5 Steps to Choosing the Right Medicare Plan for You" — Last accessed 25 May, 2025
MedicarePlans.com is an independent informational resource and has no affiliation with, or endorsement from, the U.S. Government or the federal Medicare program.
Data provenance is documented in accordance with the U.S. Core Data for Interoperability (USCDI) Provenance standard .
Page content independently curated and maintained by David W. Bynon, Editorial Steward, using a standardized, data-driven methodology for accurate, non-commercial Medicare plan interpretation and resolution.