Is my Medicare plan ending in Castle Rock, CO?
Medicare plans are set by county. Castle Rock is in Douglas County, so the plans listed as leaving Douglas County for 2027 apply to Castle Rock residents.
Quick answer for Castle Rock
27 Medicare plans are from 7 companies listed in Douglas County for 2026 but not for 2027, covering at least 1,797 people enrolled today. If you live in Castle Rock and have one of these plans, you can choose a new plan from October 15 to December 7, and coverage starts January 1.
Companies with plans leaving Douglas County
| Company | Plans leaving | People enrolled (at least) |
|---|---|---|
| UnitedHealthcare | 7 | 932 |
| Aetna (CVS Health) | 5 | 479 |
| Humana | 4 | 165 |
| Kaiser Permanente | 1 | 93 |
| Intermountain Health Care | 3 | 74 |
| Cigna HealthSpring (HCSC) | 5 | 54 |
| Group 1001 | 2 | not listed |
Plans going away in Douglas County
| Plan going away | Company | People enrolled (at least) |
|---|---|---|
| Aetna Medicare Signature (HMO-POS) H3931-153 | Aetna (CVS Health) | 401 |
| UHC Dual Complete CO-S4 (HMO-POS D-SNP) H0624-006 | UnitedHealthcare | 320 |
| Erickson Advantage Signature (HMO-POS) H5652-001 | UnitedHealthcare | 284 |
| Erickson Advantage Liberty (HMO-POS) H5652-008 | UnitedHealthcare | 142 |
| Humana Full Access H5216-333 (PPO) H5216-333 | Humana | 113 |
| Erickson Advantage Freedom (HMO-POS) H5652-006 | UnitedHealthcare | 94 |
| Kaiser Permanente Senior Advantage Choice DM (PPO) H3138-001 | Kaiser Permanente | 93 |
| Erickson Advantage Liberty no Rx (HMO-POS) H5652-002 | UnitedHealthcare | 72 |
| Aetna Medicare Signature (HMO-POS) H4711-008 | Aetna (CVS Health) | 67 |
| HealthSpring Preferred (HMO) H0672-024 | Cigna HealthSpring (HCSC) | 54 |
| Select Health Medicare + Kroger (HMO) H1994-030 | Intermountain Health Care | 47 |
| HumanaChoice H5216-437 (PPO) H5216-437 | Humana | 28 |
| Select Health Medicare Flex (HMO) H1994-031 | Intermountain Health Care | 27 |
| Humana Value Plus H5216-195 (PPO) H5216-195 | Humana | 24 |
| Erickson Advantage Champion (HMO-POS C-SNP) H5652-004 | UnitedHealthcare | 20 |
See all 24 plans leaving Douglas County →
What to do if you live in Castle Rock
- Read the notice from your plan. It names the plan that is ending and your choices.
- Compare 2027 options before December 7: another Medicare Advantage plan, or Original Medicare with a Medicare Supplement and a Part D drug plan.
- Check that your doctors, hospitals and pharmacy near Castle Rock are covered by any plan you consider.
- Free, unbiased help: Colorado State Health Insurance Assistance Program (SHIP) at 303-894-7552, or Medicare.gov, 1-800-MEDICARE.
Is my Medicare plan ending in Castle Rock?
Medicare plans are offered by service area, usually county by county. Check the list above for your plan name or plan ID. A plan can be listed because it was renumbered or replaced, so your plan notice is the final word.
What happens if I do nothing in Castle Rock?
If your plan is not renewing and you do not choose a new one, you may be moved to Original Medicare, which does not include drug coverage. Compare options before December 7 and confirm your dates with Medicare.gov or your plan notice.
Do I have to enroll if I call?
No. Calling is a conversation about your options, and you are never required to enroll.
Castle Rock residents: call 855-367-1095
Call Lander LLC to go over your options. There is no cost to call or to speak with an agent, and you are never required to enroll in anything.
Call 855-367-1095 Open 8 AM-10 PM Eastern timeMore for Castle Rock: Castle Rock health insurance · Douglas County · All Colorado plans ending for 2027 · Castle Rock population 81,415 (Census Bureau).
Source: CMS Medicare Advantage and Part D landscape files for 2026 and 2027, and CMS enrollment data from September 2026.
Reviewed by Richard Lander, licensed insurance agent (NPN 21255551), Lander LLC. Last updated October 3, 2026. This page is educational and is not a quote, an offer of coverage, or legal or tax advice.