Which Aetna Medicare Signature (HMO) plan ID ends
Your plan has an ID that starts with H, such as H4982-004. It appears on your plan's documents, and if you are not sure which one you have, Lara Goulson can check it with you from your member card. The table shows the Aetna Medicare Signature (HMO) plan ID that CMS lists as ending in California, the counties it served in 2026 and its members in September 2026.
| Plan ID | Counties served in 2026 | Members, September 2026 |
|---|---|---|
| H4982-004 | San Diego | 1,355 |
Other Aetna Medicare Signature (HMO) plan IDs in 2027
Not every plan with this name is ending. The CMS 2027 plan crosswalk and Landscape file show what happens to the other Aetna Medicare Signature (HMO) plan IDs in California. If your plan ID is below, your plan continues or moves into the plan shown, and your Annual Notice of Change explains what changes for 2027.
| Plan ID in 2026 | What happens in 2027 | Counties where it is not offered in 2027 |
|---|---|---|
| H0523-022 | Continues as Aetna Medicare Signature Legacy (HMO) | None |
| H0523-065 | Continues under the same name | None |
| H4982-001 | Continues under the same name | None |
| H4982-002 | Continues under the same name | None |
| H4982-003 | Continues under the same name | None |
| H4982-007 | Continues under the same name | None |
Where members of the ending Aetna Medicare Signature (HMO) plan live, and how many plans each county has for 2027
This plan served San Diego County in 2026. That county still has Medicare Advantage plans open to general enrollment in 2027: the plans column counts them from the CMS 2027 Landscape file, leaving out Special Needs Plans. Goulson Insurance does not offer every plan in every county, and Medicare.gov and 1-800-MEDICARE list all of them.
| County | Members, September 2026 | Plans open to general enrollment in 2027 |
|---|---|---|
| San Diego | 1,355 | 46 |
Source: Goulson Insurance analysis of the CMS CY2027 Plan Crosswalk (October 1, 2026), the CMS CY2026 and CY2027 Medicare Advantage Landscape files, and CMS Monthly Enrollment by Contract, Plan, State and County (September 2026). CMS hides county counts of 10 or fewer members, so member counts are minimums, and members living outside a plan's listed counties count toward plan totals only. Free to republish with credit under CC BY 4.0.
Your deadlines and rights when a plan ends or leaves your county
You can use the Annual Enrollment Period, October 15 through December 7, to choose your 2027 coverage. When your plan is not renewed for 2027, whether the insurer ends that plan, stops offering it in your county or ends its whole contract with Medicare, you have a Special Enrollment Period from December 8 through the last day of February. Coverage you choose by December 31 starts January 1 with no gap, while coverage you choose in January starts February 1 and coverage you choose in February starts March 1, leaving you on Original Medicare alone until then. If you make no choice, you return to Original Medicare automatically, but for most people drug coverage does not follow: unless you choose a Part D plan you may start the year without it, and if you later join a drug plan after going 63 days or more in a row without creditable drug coverage, a late enrollment penalty is added to your premium for as long as you have Medicare drug coverage, unless you get Extra Help. If you have Extra Help or Medi-Cal, Medicare may assign you a drug plan automatically, though you can still choose a different one. When your plan ends, you can also have a guaranteed issue right to buy certain Medigap policies with no medical underwriting, from the date you receive your plan's termination notice until 63 days after your coverage ends, but only if you return to Original Medicare; if you join another Medicare Advantage plan instead, you give that right up. If you have Medi-Cal, insurers generally cannot sell you a Medigap policy. Our guide to a plan ending for 2027 explains each of these in more detail.
Next steps for 2027
These pages can help you compare your choices for 2027. The Medigap rates and Medicare Advantage pages cover Los Angeles County. Lara is licensed across California and can go over your options with you at no cost.
Bring your letter, your list of doctors and your prescriptions
Replacing a plan that is ending usually takes one conversation. Lara Goulson will go over your letter, your list of doctors and your prescriptions, and compare the plans she offers in your county at no cost.
Is Aetna Medicare Signature (HMO) your plan? Call (818) 472-5484 and we will help you choose what comes next, at no cost.
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