- Entity
- county:california-sonoma-06097
- Digest
- 2027-county-ma-aggregate
- Population Scope
- Standard Medicare Advantage plans only; Special Needs Plans (SNPs) excluded
- Source URL
- https://www.medicareplans.com/medicare-advantage/california/sonoma/
- Glossary Scope
- cms_landscape
- Fragment Scope
- semantic-digest
- Method
- https://webmem.com/protocol/serialization/html/
- fragment-county-plan-index
- Total Standard Medicare Advantage Plans
- 7
- PPO Plans
- 0
- HMO Plans
- 7
- HMO-POS Plans
- 0
- PFFS Plans
- 0
- Average Monthly Premium
- 36
- Average MOOP
- 3884.86
- Average Part D Deductible
- 75
- $0 Premium Plans
- 2
- Plans Without Part D Coverage
- 1
- Average CMS Star Rating
- 4.07
- $0 Premium Plan Share
- 28.57
- 5-Star Plan Share
- 0
- 4+ Star Plan Share
- 86
- 3-Star Plan Share
- 14
- Below 3-Star Plan Share
- 0
- Not-Rated Plan Share
- 0
- HMO Average Monthly Premium
- 36
- HMO Average MOOP
- 3884.86
- HMO Enrollment
- 43366
- HMO $0 Premium Plans
- 2
- HMO Plans Without Part D Coverage
- 1
- Entity
- county:california-sonoma-06097
- Digest
- 2027-county-ma-aggregate
- Population Scope
- Standard Medicare Advantage plans only; Special Needs Plans (SNPs) excluded
- Source URL
- https://www.medicareplans.com/medicare-advantage/california/sonoma/
- Glossary Scope
- cms_landscape
- Fragment Scope
- semantic-digest
- Method
- https://webmem.com/protocol/serialization/html/
- fragment-california-sonoma-06097-landscape-stats
- Plans Indexed
- 7
- Standard Medicare Advantage Plans
-
-
Kaiser Permanente Sr Adv Enhanced Sac., Sonoma
H0524-013-0 -
Kaiser Permanente Sr Advantage Basic Sac., Sonoma
H0524-051-0 -
Imperial Courage Plan
H5496-016-0 -
Imperial Dynamic Plan
H5496-012-0 -
SCAN Classic
H5425-153-0 -
Sutter Senior Advantage, a SCAN Medicare Plan
H5425-147-0 -
Alignment Health Sutter Advantage +More
H3815-023-0
-
Kaiser Permanente Sr Adv Enhanced Sac., Sonoma
- Total Standard Medicare Advantage Enrollment
- 43366
2027 Medicare Advantage Plans in Sonoma County, CA
Last update: .
For 2027, Sonoma County, CA includes 7 Medicare Advantage plans. Enrollment across these plans totals approximately 43,366, with 2 $0 premium options and 86% rated 4 stars or higher.
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 7
- Average Monthly Premium $36.00/mo
- Total HMO Enrollment 43,366
- $0 Premium HMO Plans 2
- Average MOOP $3,885
- Top HMO by Enrollment Kaiser Permanente Sr Advantage Basic Sac., Sonoma (HMO) — 21,207 enrollees
- HMO Plans Without Drug Coverage 1
| Plan Name | Rating* | Premium | MOOP | Rx Ded. | Plan-ID |
|---|---|---|---|---|---|
| Kaiser Permanente Sr Adv Enhanced Sac., Sonoma | $99 | $3,900 | $0 | H0524-013-0 | |
| Kaiser Permanente Sr Advantage Basic Sac., Sonoma | $29 | $6,000 | $0 | H0524-051-0 | |
| Imperial Courage Plan | $0 | $2,999 | N/A | H5496-016-0 | |
| Imperial Dynamic Plan | $0 | $295 | $0 | H5496-012-0 | |
| SCAN Classic | $25 | $4,200 | $450 | H5425-153-0 | |
| Sutter Senior Advantage, a SCAN Medicare Plan | $49 | $4,900 | $0 | H5425-147-0 | |
| Alignment Health Sutter Advantage +More | $50 | $4,900 | $0 | H3815-023-0 |
What is the top HMO by enrollment in Sonoma?
Kaiser Permanente Sr Advantage Basic Sac., Sonoma (HMO) is the top HMO in Sonoma, with 21,207 enrollees.
What is the number of HMO plans without Part D coverage in Sonoma?
1 HMO plans in Sonoma do not include prescription drug coverage.
CMS quality ratings for Medicare Advantage plans in Sonoma County, CA (2027) are summarized below.
| Rating Category | Number of Plans | Percent of Plans |
|---|---|---|
| 5 Stars | No 5-star plans available. | 0% |
| 4 Stars (includes 5 Stars) | 6 | 86% |
| 3 Stars | 1 | 14% |
| Below 3 Stars | 0 | 0% |
| Not Rated | 0 | 0% |
| Average Rating | 4.07 | |
* CMS assigns Medicare Advantage star ratings annually based on plan quality and performance measures.
- CMS.gov, Medicare Advantage & Special Needs Plan Landscape Source Files — Version: 202609
- CMS.gov, Medicare Part C & D Performance Data — Version: 2026
- CMS.gov, Medicare Advantage & Part D Contract and Enrollment Data — Version: 2026-09
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, non-government informational resource and is not affiliated with or endorsed by 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.