Medicare plans
Sonoma County, CA
13 Medicare Advantage plans and 10 drug-only plans are offered in Sonoma County, CA for 2027. 6 of the Advantage plans have a $0 monthly premium.
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Plans by type
| Type | Plans |
|---|---|
| Advantage | 1 |
| Advantage with drugs | 12 |
| Drug only | 10 |
| All plans | 23 |
6 of these are Special Needs Plans, open only to people who qualify. The 10 drug-only plans are listed for all of California.
Source: CMS Medicare Advantage and Part D landscape files, as of September 30, 2026. Publisher page
Premiums and out-of-pocket limits
| Measure | 2027 |
|---|---|
| Advantage monthly premium | $0 to $99 |
| Advantage plans at $0 | 6 |
| Advantage out-of-pocket maximum (in network) | $295 to $9,850 |
| Drug-only monthly premium | $5.30 to $252.60 |
Source: CMS Medicare Advantage and Part D landscape files, as of September 30, 2026. Publisher page
Star Ratings
| Overall rating | Advantage plans |
|---|---|
| 3 stars | 1 |
| 3.5 stars | 1 |
| 4 stars | 8 |
| 4.5 stars | 3 |
11 Advantage plans in Sonoma County, CA have an overall rating of 4 stars or more.
Source: CMS 2027 Medicare Part C and D Star Ratings, as of October 8, 2026. Publisher page
Source: CMS Medicare Advantage and Part D landscape files, as of September 30, 2026. Publisher page
Change from 2026
Sonoma County, CA has 13 Advantage plans in 2027, 4 more than 2026 (9). 6 plans are new to the county and 2 plans offered here in 2026 are gone. $0 plans go from 5 to 6.
| Advantage plans | 2026 | 2027 |
|---|---|---|
| Offered in the county | 9 | 13 |
| At a $0 premium | 5 | 6 |
| New for 2027 | 6 | |
| Offered in 2026, gone in 2027 | 2 |
Offered here in 2026, not in 2027
- Anthem Dual Advantage 2 (PPO D-SNP) (H4704-002, Elevance Health, Inc.)
- Alignment Health My Choice (PPO) (H4961-003, Alignment Healthcare USA, LLC)
Source: CMS Medicare Advantage and Part D landscape files, as of September 30, 2026. Publisher page
Source: CMS CY2026 Medicare Advantage and Part D landscape file, as of September 25, 2025. Publisher page
Plans by parent organization
| Parent organization | Advantage | Drug only | Total |
|---|---|---|---|
| Alignment Healthcare USA, LLC | 1 | 0 | 1 |
| California Physicians' Service | 0 | 2 | 2 |
| Centene Corporation | 0 | 2 | 2 |
| Elevance Health, Inc. | 1 | 0 | 1 |
| Health Care Service Corporation | 0 | 1 | 1 |
| Humana Inc. | 0 | 3 | 3 |
| Imperial Health Plan of California | 4 | 0 | 4 |
| Kaiser Foundation Health Plan, Inc. | 3 | 0 | 3 |
| SCAN Group | 4 | 0 | 4 |
| UnitedHealth Group, Inc. | 0 | 2 | 2 |
Source: CMS Medicare Advantage and Part D landscape files, as of September 30, 2026. Publisher page
Every 2027 plan in Sonoma County, CA
23 plans, by plan name. Select a column to sort.
| Plan ↑ | Type | Premium | Out-of-pocket max | Drug deductible | Stars |
|---|---|---|---|---|---|
| AARP Medicare Rx Preferred from UHC (PDP)S5921-413-0 · UnitedHealth Group, Inc. | Drug onlyPDP | $242.60 | n/a | $300 | 3 |
| AARP Medicare Rx Saver from UHC (PDP)S5921-376-0 · UnitedHealth Group, Inc. | Drug onlyPDP | $170.80 | n/a | $700 | 3 |
| Alignment Health Sutter Advantage +More (HMO)H3815-023-0 · Alignment Healthcare USA, LLC | Advantage with drugsHMO | $50 | $4,900 | $0 | 3.5 |
| Anthem Chronic Care Advantage (PPO C-SNP)H4909-029-0 · Elevance Health, Inc. | Advantage with drugsPPO C-SNP | $0 | $9,850 | $0 | 3 |
| Blue Shield Rx Enhanced (PDP)S2468-004-0 · California Physicians' Service | Drug onlyPDP | $252.60 | n/a | $200 | 2.5 |
| Blue Shield Rx Plus (PDP)S2468-003-0 · California Physicians' Service | Drug onlyPDP | $210 | n/a | $700 | 2.5 |
| HealthSpring Assurance Rx (PDP)S5715-049-0 · Health Care Service Corporation | Drug onlyPDP | $9.30 | n/a | $700 | 2.5 |
| Humana Basic Rx Plan (PDP)S5884-114-0 · Humana Inc. | Drug onlyPDP | $118.30 | n/a | $700 | 4.5 |
| Humana Premier Rx Plan (PDP)S5884-178-0 · Humana Inc. | Drug onlyPDP | $191.20 | n/a | $350 | 4.5 |
| Humana Value Rx Plan (PDP)S5884-211-0 · Humana Inc. | Drug onlyPDP | $130.30 | n/a | $687 | 4.5 |
| Imperial Courage Plan (HMO)H5496-016-0 · Imperial Health Plan of California | AdvantageHMO | $0 | $2,999 | n/a | 4 |
| Imperial Dynamic Plan (HMO)H5496-012-0 · Imperial Health Plan of California | Advantage with drugsHMO | $0 | $295 | $0 | 4 |
| Imperial Flex (HMO C-SNP)H5496-017-0 · Imperial Health Plan of California | Advantage with drugsHMO C-SNP | $2.70 | $9,850 | $450 | 4 |
| Imperial Senior Value (HMO C-SNP)H5496-005-0 · Imperial Health Plan of California | Advantage with drugsHMO C-SNP | $0 | $295 | $0 | 4 |
| Kaiser Permanente Dual Complete North P25 (HMO D-SNP)H8794-025-0 · Kaiser Foundation Health Plan, Inc. | Advantage with drugsHMO D-SNP | $0 | $9,850 | $700 | 4.5 |
| Kaiser Permanente Sr Adv Enhanced Sac., Sonoma (HMO)H0524-013-0 · Kaiser Foundation Health Plan, Inc. | Advantage with drugsHMO | $99 | $3,900 | $0 | 4.5 |
| Kaiser Permanente Sr Advantage Basic Sac., Sonoma (HMO)H0524-051-0 · Kaiser Foundation Health Plan, Inc. | Advantage with drugsHMO | $29 | $6,000 | $0 | 4.5 |
| SCAN Balance (HMO C-SNP)H5425-150-0 · SCAN Group | Advantage with drugsHMO C-SNP | $27 | $4,200 | $450 | 4 |
| SCAN Classic (HMO)H5425-153-0 · SCAN Group | Advantage with drugsHMO | $25 | $4,200 | $450 | 4 |
| SCAN Strive (HMO C-SNP)H5425-098-0 · SCAN Group | Advantage with drugsHMO C-SNP | $0 | $9,850 | $450 | 4 |
| Sutter Senior Advantage, a SCAN Medicare Plan (HMO)H5425-147-0 · SCAN Group | Advantage with drugsHMO | $49 | $4,900 | $0 | 4 |
| Wellcare Classic (PDP)S4802-094-0 · Centene Corporation | Drug onlyPDP | $7.30 | n/a | $700 | 3 |
| Wellcare Value Script (PDP)S4802-163-0 · Centene Corporation | Drug onlyPDP | $5.30 | n/a | $700 | 3 |
Source: CMS Medicare Advantage and Part D landscape files, as of September 30, 2026. Publisher page
Source: CMS 2027 Medicare Part C and D Star Ratings, as of October 8, 2026. Publisher page
For agents, pharmacies, and practices
Run this for a client's ZIP
Rivvi's county landscape snapshot opens with Sonoma County, CA filled in. Swap in a client's ZIP to get every 2027 plan in their county, counted by type and carrier, with premium and out-of-pocket ranges.
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For pharmacies and practices
Check your patients' drugs on these plans
Enter a drug and Rivvi compares its 2026 and 2027 Part D formulary placement on every plan near a ZIP: tier changes, new prior authorization, step therapy, and quantity limits.
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Neighboring counties
Health data for Sonoma County, CA
About this data
Plans, premiums, out-of-pocket maximums, and drug deductibles come from the CMS CY2027 Medicare Advantage and Part D landscape file. Change from 2026 compares it with the CY2026 landscape. Stars are the 2027 Star Ratings CMS released October 8, 2026: the overall rating for Advantage plans and the Part D summary rating for drug-only plans, which have no overall rating.
Advantage counts include Special Needs Plans, which are open only to people who qualify. Drug-only plans are listed by CMS for a whole state, so every county page shows them. Employer group plans are not in the file. This page lists plans; it does not say which plan fits anyone, and Rivvi does not sell plans.
Source: CMS Medicare Advantage and Part D landscape files, as of September 30, 2026. Publisher page
Source: CMS CY2026 Medicare Advantage and Part D landscape file, as of September 25, 2025. Publisher page
Source: CMS 2027 Medicare Part C and D Star Ratings, as of October 8, 2026. Publisher page