Among King County cities with more than 10,000 people, Shoreline has the third-highest share of older residents: about 12,100 residents are 65 or over, close to 20% of the city, compared with 14.0% county-wide (Census ACS 2020–2024). A Medicare Advantage plan pulling out of the county lands hard in a place like this. Below is one made-up example of how a Shoreline resident might work through it, followed by the facts that apply to everyone.
Example: a Shoreline resident with a plan-leaving letter
Example (hypothetical, not a real client): Ruth is 74 and lives near the 185th Street light rail station. In early October her Medicare Advantage plan wrote to say it won't serve King County in 2027. She has a primary care doctor in Shoreline, a cardiologist in Seattle, and three regular prescriptions.
Step 1, late October. Ruth finds the letter and the envelope and puts them in a folder. She writes down every doctor, the hospital she'd want to go to, her pharmacy, and each drug with its dose.
Step 2, early November. She enters her drugs and pharmacy on Medicare Plan Finder and looks at two kinds of 2027 coverage: other Medicare Advantage plans in the county, and Original Medicare with a stand-alone Part D plan. For each Medicare Advantage option she checks whether her cardiologist and her primary care doctor are both in network. Shoreline has no hospital in the DOH and CMS lists, so the hospital she'd use is in another city; she checks that too.
Step 3, mid-November. She decides. If she goes with Original Medicare, she applies for a Medigap policy now (OIC says no earlier than November 1) and picks a Part D plan, both to start January 1. If she goes with another Medicare Advantage plan, she enrolls in it.
Step 4, December. She confirms the new cards arrive and that her pharmacy has the new drug plan on file before January 1.
Ruth's order of operations works for most people. The part people skip is Step 3's Medigap timing, so here's why it matters.
The Medigap door, and the trial right
When your Medicare Advantage plan ends, Washington law gives you a guaranteed issue right to certain Medigap policies, but only if you go to Original Medicare. During the window an insurer can't turn you down or charge you more over your health. It opens when you get the termination notice and shuts 63 days after the plan ends: March 4, 2027. Insurers must accept an application sent before your plan ends; coverage begins once it does.
There's a second, narrower right some Shoreline readers may have. If this was your first Medicare Advantage plan, you joined when you first got Part A at 65, and you've been in it less than a year, you may have a "trial right" that opens any Medigap policy sold in Washington. Same goes if you dropped a Medigap policy to join your first Medicare Advantage plan less than a year ago: you may be able to get that Medigap back. Ask SHIBA whether either applies to you.
Shoreline compared with King County
| Measure | Shoreline | King County |
|---|---|---|
| Population, April 1, 2026 | 64,710 | – |
| Residents 65+ (ACS 2020–2024) | 12,127 (19.7%) | 320,899 (14.0%) |
| Medicare enrollees, July 2026 | not published | 368,813 |
| Medicare Advantage and other health plans | – | 197,594 |
| Original Medicare | – | 171,219 |
| Hospital with a city address | none listed | – |
Sources: WA OFM; U.S. Census Bureau ACS 2020–2024 (B09020); CMS Medicare Monthly Enrollment, July 2026, King County; WA DOH and CMS hospital files.
If Shoreline looks like the county, a little over half of the residents on Medicare are in Medicare Advantage or a similar plan. With nearly one resident in five over 65, that is a lot of neighbors comparing notes this month. Just remember your plan, doctors and drugs are yours; a neighbor's choice may be wrong for you.
The non-negotiable dates
- Your plan pays claims through December 31, 2026.
- Choose by December 31 and your new coverage starts January 1.
- You have a special enrollment period from December 8, 2026 to February 28, 2027 because your plan is ending. A January choice starts February 1; a February choice starts March 1.
- Do nothing and you're in Original Medicare on January 1 without a Part D plan, unless you get Extra Help, in which case CMS reassigns you to one.
The full side-by-side of both options is in the statewide guide.
Help close to home
The Shoreline-Lake Forest Park Senior Activity Center sits at 18560 1st Avenue NE (Building G). King County's directory lists health services there, including foot care and visits from the Chinese Information and Service Center, open Monday to Thursday 8:30 to 4 and Friday mornings.
For the Medicare decision itself, call SHIBA's statewide line at 800-562-6900 (8:30 a.m. to 4:30 p.m. on weekdays) for free, unbiased counseling. As of October 26, 2026, OIC showed King County's local SHIBA sponsors as "Currently not accepting appointments" and pointed people to 1-800-MEDICARE (1-800-633-4227), which never closes.
New doctors in Seattle or Lynnwood? Shoreline South/148th and Shoreline North/185th stations are on both the 1 Line and 2 Line. A Regional Reduced Fare Permit cuts the fare; a Medicare card or being 65 qualifies you.
Your plan's notice sets the actual dates for your case, and federal Medicare law plus Washington's insurance code sit behind everything here; ask SHIBA, Medicare or a licensed agent to confirm before you change coverage.
Shoreline questions
What is a Medigap trial right?
Ruth’s cardiologist is in Seattle. Why does that matter?
When should I apply for Medigap if I leave Medicare Advantage?
Where can I get help near Shoreline?
Sources
- WA OFM April 1, 2026 population
- Census ACS 2020–2024, table B09020
- CMS Medicare Monthly Enrollment, July 2026
- Medicare: Choosing a Medigap Policy (2026)
- RCW 48.66.055
- OIC: Is your Medicare Advantage plan changing or leaving?
- CMS CY2027 enrollment and disenrollment guidance
- King County: Shoreline-Lake Forest Park Senior Activity Center health services
- Sound Transit 1 Line schedule
- Sound Transit 2 Line schedule
- King County Metro: Regional Reduced Fare Permit
- OIC: Find a local SHIBA office
