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Medicare plans in Marin County, CA — 2026
What agents look up before working a county: plan count, carriers, $0-premium share, star distribution, MOOP range, the 65+ and 60–64 population, and what changed since last year.
In 2026, Marin County, California has 35 Medicare plans (10 Medicare Advantage with drug coverage, 2 without, 12 standalone Part D, 11 Special Needs) from 11 carriers. 13 Medicare Advantage plans have a $0 premium. The lowest in-network out-of-pocket maximum is $296.
Market snapshot
- Residents 65 and older
- 61,345
- Residents 60–64, aging in over the next five years
- 17,743
- Medicare eligibles
- 65,177
- Medicare Advantage penetration
- 45.3%
- Plans per 1,000 residents 65+
- 0.6
Carriers by number of plans
- Alignment Health Plan — 10 plans
- Humana — 6 plans
- Align Senior Care — 3 plans
- Imperial Health Plan of California, Inc. — 3 plans
- Kaiser Permanente — 3 plans
- Blue Shield of California — 2 plans
- HealthSpring — 2 plans
- UnitedHealthcare — 2 plans
Plans sorted by CMS star rating, then premium
| Plan | Carrier | Category | Plan type | Monthly premium | Drug deductible | Out-of-pocket maximum | Star rating |
|---|
| Kaiser Permanente Senior Advantage Basic Marin (HMO) (H0524-064-0) | Kaiser Permanente | MA-PD | HMO | $19 | $0 | $6,000 | 4.5 |
|---|
| Kaiser Permanente Sr Adv Enhanced Marin San Mateo (HMO) (H0524-031-0) | Kaiser Permanente | MA-PD | HMO | $89 | $0 | $3,900 | 4.5 |
|---|
| Alignment Health CalPlusDuals (HMO D-SNP) (H3815-030-0) | Alignment Health Plan | SNP | HMO D-SNP | $0 | $615 | $9,250 | 4.0 |
|---|
| Alignment Health Heart & Diabetes (HMO C-SNP) (H3815-010-0) | Alignment Health Plan | SNP | HMO C-SNP | $0 | $0 | $1,499 | 4.0 |
|---|
| Alignment Health Heart & Diabetes Care (HMO C-SNP) (H3815-048-0) | Alignment Health Plan | SNP | HMO C-SNP | $0 | $0 | $1,990 | 4.0 |
|---|
| Alignment Health Honor+ Plan (HMO) (H3815-052-0) | Alignment Health Plan | MA-PD | HMO | $0 | $615 | $9,250 | 4.0 |
|---|
| Alignment Health My Choice CalCare (HMO) (H3815-050-0) | Alignment Health Plan | MA-PD | HMO | $0 | $0 | $3,499 | 4.0 |
|---|
| Alignment Health Platinum + Instacart (HMO-POS) (H3815-016-0) | Alignment Health Plan | MA-PD | HMO-POS | $0 | $0 | $998 | 4.0 |
|---|
| Kaiser Permanente Dual Complete North P25 (HMO D-SNP) (H8794-025-0) | Kaiser Permanente | SNP | HMO D-SNP | $0 | $615 | $9,250 | 4.0 |
|---|
| Alignment Health Heart & Diabetes Choice (HMO C-SNP) (H3815-051-0) | Alignment Health Plan | SNP | HMO C-SNP | $0.70 | $615 | $9,250 | 4.0 |
|---|
Showing 10 of 35 plans.
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About this data
Source: CMS Medicare Advantage/Part D Landscape files, plan year 2026; population: U.S. Census Bureau ACS 5-year 2024; MA penetration: CMS September 2026.
This page summarizes publicly available CMS data. It is not a plan finder and does not recommend plans. To compare and enroll in plans, use Medicare.gov or talk to a licensed agent. Medicare.gov plan finder.