2026 Medicare Advantage Plans in Sonoma County, CA
Last update: . Enrollment data updated: May 2, 2026
For 2026, Sonoma County, CA includes 6 Medicare Advantage plans. Enrollment across these plans totals approximately 43,478, with 2 $0 premium options and 67% rated 4 stars or higher.
Totals on this page exclude Medicare Advantage Special Needs Plans (SNPs). SNP plans for Sonoma County, CA are provided separately. Or you can discover all Medicare Options in Sonoma County, CA.
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
- 1
- Average Monthly Premium
- $106.00/mo
- Total PPO Enrollment
- 630
- $0 Premium PPO Plans
- 0
- Average MOOP
- $4,200
- Top PPO by Enrollment
- Alignment Health My Choice (PPO) — 630 enrollees
- PPO Plans Without Drug Coverage
- 0
| PPO Plan Name | Rating* | Premium | MOOP | Rx Ded. | Plan-ID |
|---|---|---|---|---|---|
| Alignment Health My Choice | $106 | $4,200 | $0 | H4961-003-0 |
What is the typical premium for PPO plans available in Sonoma?
PPO plans in Sonoma cost $106.00 per month on average.
Which PPO plan do most beneficiaries choose in Sonoma?
The most popular PPO plan in Sonoma is Alignment Health My Choice (PPO), with 630 enrollees.
How many PPO options are offered without drug coverage in Sonoma?
0 PPO plans in Sonoma do not include prescription drug coverage.
Medicare Advantage HMO Plans
Health Maintenance Organization (HMO) plans generally require members to use in-network doctors, hospitals, and other providers, except in emergencies. Because of this structure, HMOs often have lower premiums and out-of-pocket costs than other plan types.
- Total HMO Plans 5
- Average Monthly Premium $33.40/mo
- Total HMO Enrollment 42,848
- $0 Premium HMO Plans 2
- Average MOOP $3,619
- Top HMO by Enrollment Kaiser Permanente Sr Advantage Basic Sac., Sonoma (HMO) — 20,893 enrollees
- HMO Plans Without Drug Coverage 1
| Plan Name | Rating* | Premium | MOOP | Rx Ded. | Plan-ID |
|---|---|---|---|---|---|
| Kaiser Permanente Sr Adv Enhanced Sac., Sonoma | $95 | $3,900 | $0 | H0524-013-0 | |
| Kaiser Permanente Sr Advantage Basic Sac., Sonoma | $24 | $6,000 | $0 | H0524-051-0 | |
| Alignment Health Sutter Advantage +More | $48 | $4,900 | $0 | H3815-023-0 | |
| Imperial Courage Plan | $0 | $2,999 | N/A | H5496-016-0 | |
| Imperial Dynamic Plan | $0 | $296 | $0 | H5496-012-0 |
What is the total number of HMO plans offered in Sonoma?
In 2026, Sonoma County has 5 HMO plans with 42,848 enrollees.
How much do HMO plans cost in Sonoma?
The typical HMO premium in Sonoma is $33.40, and 2 plans have no monthly premium.
CMS quality ratings for Medicare Advantage plans in Sonoma 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) | 4 | 67% |
| 3 Stars | 2 | 33% |
| Below 3 Stars | 0 | 0% |
| Not Rated | 0 | 0% |
| Average Rating | 4 | |
* Star ratings are based on CMS quality measures and reflect plan performance for the 2026 rating period.
- CMS.gov, Medicare Advantage Landscape Source Files — Last accessed May 2, 2026
- CMS.gov, Medicare Part C & D Performance Data — Last accessed May 2, 2026
- CMS.gov, Medicare Advantage & Part D Contract and Enrollment Data — Last accessed May 2, 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, "Explore your Medicare coverage options" — Last accessed 25 May, 2025
- NCOA.org, "5 Steps to Choosing the Right Medicare Plan for You" — Last accessed 25 May, 2025
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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.