Medicare Advantage Changes for 2027 in Arlington, WA

Cascade Valley Hospital, at 330 S. Stillaguamish Ave. in Arlington and part of Skagit Regional Health, is the only general acute-care hospital that state and federal records list in Snohomish County north of Everett. So if your Medicare Advantage plan is changing or ending for 2027 and you live in Arlington, the first question isn't abstract. It's this: will my next plan let me keep going to Cascade Valley, and to the doctors I already see?

Arlington in numbers

Measure	Arlington	Snohomish County
People (OFM count, April 2026)	23,390	879,700
Age 65+ (ACS 2020-2024)	about 2,900 (plus or minus 390)	124,763
65+ share	13.8%	14.8%
Medicare beneficiaries in Medicare Advantage and other health plans (CMS, July 2026)	CMS doesn't break this out by city	59.6% of 152,940
Land area	about 10 square miles	about 2,087 square miles

From OFM; Census ACS 2020-2024 and the 2025 Census Gazetteer; CMS enrollment data for July 2026.

Arlington skews slightly younger than the county. CMS doesn't publish city figures; countywide, about six of every ten Medicare beneficiaries are in Medicare Advantage and other health plans.

Two roads, seen from Arlington

Medicare's handbook boils it down: when a plan stops participating, you join another Medicare Advantage plan or go back to Original Medicare. Here is how each looks if Cascade Valley and your local doctors are what you care about most.

Question	A different Medicare Advantage plan	Original Medicare, plus Part D, plus Medigap if you want it
Can I keep using Cascade Valley?	Only if it is in that plan's 2027 network. Check by name.	Yes, if the hospital accepts Medicare.
What about specialists in Everett or Mount Vernon?	Each must be in the network; you may need referrals.	Any provider who takes Medicare; usually no referral.
Drugs	Most plans include them.	A separate Part D plan.
Yearly cost ceiling	The plan has an out-of-pocket limit for covered services.	None in Original Medicare by itself; Medigap fills much of the gap.
Second chance	If you join by January 1, one more switch is allowed January 1 to March 31, 2027.	A guaranteed issue right to buy Medigap without health questions, until March 4, 2027.

Based on Medicare & You 2027, CMS enrollment guidance and RCW 48.66.055.

How to check a network properly

Don't rely on a plan's general description. On Medicare Plan Finder, or on the phone with 1-800-MEDICARE (1-800-633-4227), ask about Cascade Valley Hospital by name, then each doctor by name, then your pharmacy. Write down who you spoke to and the date. Networks change every January, and the 2026 network of your old plan tells you nothing about a different plan's 2027 network.

The January to March switch has a catch

Between January 1 and March 31, 2027, people who are in a Medicare Advantage plan get one more change. That only helps if you are in a Medicare Advantage plan on January 1. If you let your plan end without choosing, you land in Original Medicare, and that January to March option isn't yours. What you'd have instead is the plan-ending special enrollment period, which runs December 8, 2026 through February 28, 2027.

Dates that apply to every Arlington resident with this letter

Your plan is good through December 31, 2026.
Whatever you choose by that date takes effect January 1, 2027.
Let it ride and Original Medicare takes over January 1, minus drug coverage. Extra Help recipients are the exception; CMS slots them into a drug plan.
If you choose Original Medicare, OIC says to apply for Medigap no earlier than November 1.

The full rules, including the Part D penalty and the Medigap plan letters available, are in the Washington statewide guide.

Local help in Arlington

Stilly Valley Center, 18308 Smokey Point Blvd. (360-653-4551), is Arlington's senior center according to the city's senior resources page.

Rides to medical appointments. The city's page links to the Homage Transportation Assistance Program, which helps eligible older adults and adults with disabilities in Snohomish County arrange curb-to-curb rides to medical appointments and errands. If a new plan sends you to a specialist in Everett, set this up early.

Tribal elders. The county's senior center list includes the Stillaguamish Tribe of Indians Elder's Program in Arlington (360-572-3466).

SHIBA and Medicare. SHIBA's statewide line is 800-562-6900, weekdays 8:30 to 4:30. When we checked on October 26, 2026, OIC showed the county's local SHIBA sponsor as "Currently not accepting appointments" and pointed people to 1-800-MEDICARE, which answers 24 hours a day, 7 days a week, except some federal holidays (TTY 1-877-486-2048).

Medicare's federal rules and Washington law are the authority here, and your plan's notice carries your exact dates; before you switch, a call to Medicare, SHIBA or a licensed agent can confirm them.

Arlington Medicare questions

Will a new Medicare Advantage plan cover Cascade Valley Hospital in Arlington?

It depends on the plan. Ask about Cascade Valley Hospital by name on Medicare Plan Finder or with 1-800-MEDICARE before you join, and check each of your doctors the same way. Under Original Medicare, any hospital that accepts Medicare is covered.

Can I use the January to March 2027 switch if my plan ends?

Only if you are in a Medicare Advantage plan on January 1, 2027. If you choose nothing and land in Original Medicare, use the special enrollment period for ending plans, which closes February 28, 2027.

Which senior center serves Arlington?

The Stilly Valley Center is at 18308 Smokey Point Blvd., phone 360-653-4551.

Is there help getting to medical appointments from Arlington?

The City of Arlington links to the Homage Transportation Assistance Program, which helps eligible older adults and adults with disabilities in Snohomish County arrange curb-to-curb rides to medical appointments.

Medicare Advantage changes for 2027 in Arlington: start with your hospital