About 2,100 Woodinville residents are 65 or older, roughly 15% of the city and a little above the King County share (Census ACS 2020–2024). For the ones whose Medicare Advantage plan is being discontinued, the rules aren't the hard part. The mistakes are. Here are seven I'd watch for, in roughly the order people make them, with what to do instead.
Woodinville at a glance
| Measure | Woodinville | King County |
|---|---|---|
| Population (OFM, April 1, 2026) | 14,350 | – |
| Residents 65+ (ACS 2020–2024, ±329) | about 2,100 (15.4%) | 320,899 (14.0%) |
| Land area | 5.6 sq mi | – |
| Hospital with a city address (DOH/CMS) | none | – |
| Medicare enrollees, July 2026 (CMS) | not reported by city | 368,813 |
| In Medicare Advantage and other health plans | – | 197,594 (53.6%) |
| In a stand-alone Part D plan | – | 108,490 |
Sources: WA OFM; U.S. Census Bureau ACS 2020–2024 (B09020) and 2025 Gazetteer; WA DOH and CMS hospital files; CMS Medicare Monthly Enrollment, July 2026.
Mistake 1: Treating the letter as junk mail
The plan was required to mail it at least 90 days before your coverage ends, so it should have been mailed by early October, and it may look like every other insurance mailer. Dig it out. It tells you the end date (usually December 31, 2026) and describes your alternatives. Keep the envelope too: the postmark is proof of when you were notified, and a Medigap insurer may want a copy.
Mistake 2: Assuming "doing nothing" keeps things the same
It doesn't. If you don't pick anything, Medicare enrolls you in Original Medicare on January 1, 2027. Your hospital and medical coverage (Parts A and B) continue, but the drug coverage that came inside your plan is gone. No Part D plan gets added for you, with one exception: if you get Extra Help, CMS reassigns you to a stand-alone drug plan. There's also no Medigap supplement unless you buy one.
Mistake 3: Using December 7 or February 28 as your deadline
Open Enrollment closes December 7, and your plan-ending special enrollment period stretches from December 8, 2026 to February 28, 2027. Both are real. But the date that keeps you covered without a break is December 31. Enroll by then and your new coverage starts January 1. Enroll in January and you start February 1; February means March 1.
Mistake 4: Signing up for another Medicare Advantage plan before thinking about Medigap
When your plan ends, Washington law gives you a guaranteed issue right to certain Medigap policies: no health screening, pre-existing conditions covered, no surcharge for your health. You only get to use it if you go to Original Medicare. Join a new Medicare Advantage plan and the right goes unused; after March 4, 2027 it's gone, and buying Medigap later usually means health questions. That doesn't make Medigap the right answer for everyone. It means decide on purpose. The statewide guide compares the two paths in detail.
Mistake 5: Applying for Medigap at the wrong time
OIC tells people to apply no earlier than November 1. Washington law says an insurer has to accept your application even though your old plan hasn't ended yet, and the Medigap coverage begins only once it does. So the clean window for a January 1 start is November and December. Waiting into the new year still works until March 4, but you'd have weeks in Original Medicare alone first.
Mistake 6: Checking the doctor but not the hospital
Woodinville has no hospital in the DOH and CMS lists, so any hospital stay is in another city. When you compare Medicare Advantage plans, look up your primary care doctor, your specialists, your pharmacy and the specific hospital you'd want, all in the plan's 2027 network. Original Medicare has no network, which is part of why some people choose it.
Mistake 7: Driving to a SHIBA office that isn't booking
SHIBA, the free and unbiased counseling service run by the Insurance Commissioner's office, is the right first call. But on October 26, 2026, OIC's pages listed King County's local SHIBA sponsors with the note "Currently not accepting appointments. For assistance, call Medicare at 1-800-633-4227." Phone first:
- SHIBA statewide: 800-562-6900, weekdays 8:30 a.m. to 4:30 p.m.
- 1-800-MEDICARE (1-800-633-4227), 24 hours a day, 7 days a week, except some federal holidays, or Plan Finder online
- Community Living Connections (King County aging and disability services): 206-962-8467
Nearby help for Woodinville
The Northshore Senior Center at 10201 East Riverside Drive in Bothell serves adults 55 and older in the Northshore area, and its listings include Woodinville in the service area. Phone (425) 286-1026. It's a reasonable place to ask about local programs and rides; for the Medicare choice, use the numbers above.
Retired Washington public employee? If your coverage runs through PEBB, OIC says to go to the Health Care Authority directly. PEBB retiree open enrollment runs October 26 through November 23, 2026.
The rules on this page are federal Medicare law and Washington statute as they read on October 26, 2026; your own plan's notice controls your dates, so run your plan of action past SHIBA, 1-800-MEDICARE or a licensed agent first.
Woodinville follow-up questions
I threw away the envelope. Is that a problem?
Can I keep my Medigap guaranteed issue right if I join another Medicare Advantage plan?
Where is the closest senior center to Woodinville?
I live in Woodinville. Which hospitals should I check?
Sources
- WA OFM April 1, 2026 population
- Census ACS 2020–2024, table B09020
- Census 2025 Gazetteer
- CMS Medicare Monthly Enrollment, July 2026
- 42 CFR 422.506
- CMS CY2027 enrollment and disenrollment guidance
- Medicare: Choosing a Medigap Policy (2026)
- RCW 48.66.055
- OIC: Is your Medicare Advantage plan changing or leaving?
- OIC: Find a local SHIBA office
- WA 211: Northshore Senior Center listing
- HCA: PEBB retiree open enrollment
