My Medicare Advantage plan is ending in Mukilteo: keep the envelope

About 3,800 Mukilteo residents are 65 or older, close to 18% of the city by the Census Bureau's 2020-2024 estimate, compared with under 15% countywide. If one of those envelopes said your Medicare Advantage plan is ending, don't throw away the envelope. That sounds trivial. It isn't, and it's the place to start.

Build your paper trail first

The guaranteed issue right that lets you buy a Medigap policy without health questions after your plan ends depends on proving the plan ended. Washington's statute asks you to submit evidence of the termination date with your Medigap application, and Medicare's Medigap guide suggests what to keep:

• The letter from your plan, or any notice or email with your name on it saying your coverage is ending.
• The postmarked envelope it came in, which shows when it was mailed.
• A call log. Every time you call 1-800-MEDICARE, SHIBA, a plan or an insurer, write the date, the person's name and what they told you. If something goes wrong in January, this is what you'll lean on.
• Plan Finder printouts or screenshots showing the 2027 plans you compared, your drug list and pharmacy.
• Confirmation numbers for any enrollment you make, and the new plan's welcome letter when it arrives.

Put it all in one folder. If you're helping a parent in Mukilteo from out of town, this folder is what lets you help over the phone.

Mukilteo's figures

Sources: WA OFM; U.S. Census ACS 2020-2024 (B09020); WA DOH and CMS hospital files; CMS Medicare Monthly Enrollment, July 2026.

With no hospital inside the city, every Mukilteo resident relies on one somewhere else. Whichever one you use, that is the name to check first in any new plan's 2027 network.

What the paperwork protects

Medigap without underwriting. If you leave Medicare Advantage for Original Medicare, Washington requires insurers to sell you certain Medigap plans, cover pre-existing conditions and not price you on your health. OIC's guidance is to apply on or after November 1. Washington law requires the insurer to accept an application sent before your plan ends, but the policy can't begin until the plan coverage stops, so a November or December application lines up with a January 1 start. The right closes March 4, 2027. Joining a different Medicare Advantage plan means you don't use it.

Your enrollment dates. Your plan covers you through December 31, 2026. Enroll in something by then and it starts January 1, 2027. A special enrollment period for people whose plan is ending runs December 8, 2026 to February 28, 2027, with January choices starting February 1 and February choices starting March 1.

Your drug coverage. If you enroll in nothing, Medicare puts you in Original Medicare on January 1, without a Part D plan (CMS assigns one only to people with Extra Help). Being without creditable drug coverage for 63 days or longer can leave you with a late enrollment penalty for as long as you have Part D.

The statewide guide lists which Medigap plan letters the right covers, by when you became eligible for Medicare.

Where Mukilteo residents can turn

Rosehill Community Center, 304 Lincoln Ave. (425-263-8180), is the City of Mukilteo's entry on the county's senior center list. Snohomish County's senior centers are open to anyone 55 and older.

SHIBA, Washington's free Medicare counseling program, takes calls on its statewide number, 800-562-6900, from 8:30 a.m. to 4:30 p.m. weekdays. When we checked on October 26, 2026, OIC's local SHIBA listing for this county said "Currently not accepting appointments. For assistance, call Medicare at 1-800-633-4227." The county sponsor's own website said its Open Enrollment events were full.

1-800-MEDICARE (TTY 1-877-486-2048) answers 24 hours a day, every day except some federal holidays, and Medicare.gov lists calling it as one way to join a plan. Ask for a confirmation number.

Snohomish County Long-Term Care & Aging (425-388-7393), the county's Area Agency on Aging, lists legal services for people over 60 among its programs, useful if a dispute about dates or coverage comes up.

Federal Medicare law and Washington statutes are the controlling rules, and your plan's notice states the dates that apply to you; keep your folder handy and confirm with 1-800-MEDICARE, SHIBA or a licensed agent.

Related pages: Washington statewide guide · Snohomish County · Arlington · Edmonds · Everett · Lake Stevens · Lynnwood · Marysville · Mill Creek · Monroe · Mountlake Terrace · Snohomish

Mukilteo questions

Sources

1. RCW 48.66.055: Medigap guaranteed issue (Washington)
2. CMS: Choosing a Medigap Policy (2026)
3. Washington OIC: Is your Medicare Advantage plan changing or leaving?
4. CMS: CY 2027 MA and Part D Enrollment and Disenrollment Guidance
5. Medicare.gov: Part D costs and late enrollment penalty
6. WA OFM: April 1, 2026 population of cities, towns and counties
7. U.S. Census Bureau: ACS 2020-2024 5-year, table B09020 (population 65+)
8. CMS Medicare Monthly Enrollment, July 2026 (Washington counties)
9. WA DOH hospital data (HOFIDAR, data.wa.gov)
10. CMS Hospital General Information
11. Snohomish County: Senior Centers listing (2026, PDF)
12. Snohomish County Long-Term Care & Aging
13. Washington OIC: Get free Medicare help from SHIBA
14. Washington OIC: Find a local SHIBA office (checked Oct 26, 2026)
15. Edmonds Waterfront Center: SHIBA & Medicare
16. Medicare Plan Finder
17. Medicare.gov: Joining a plan