Medicare Advantage changes for 2027 in Oak Harbor

Oak Harbor is the young end of an old county. It holds 28% of Island County's residents but only about 13% of its people 65 and older, according to Census Bureau survey data. Countywide, close to 27% of residents are 65+ in that survey; in Oak Harbor it's about 12.8%. Whidbey Island has hosted a naval air station since 1942, and Oak Harbor is the city beside it. That matters here for a second reason: some older residents carry TRICARE alongside Medicare, and that changes the math on a discontinued plan.

Oak Harbor against Island County

Sources: WA OFM; U.S. Census Bureau ACS 2020–2024 5-year, table B09020; CMS Hospital General Information; CMS Medicare Monthly Enrollment, July 2026 (counties only).

What "doing nothing" looks like on January 1

Here's the default, spelled out, because it's what happens to anyone who sets the letter aside.

Your current plan pays its last claim for services on December 31, 2026. On January 1, 2027, Medicare places you in Original Medicare. Part A and Part B keep working, so a hospital stay or a doctor visit is still covered. But two things your old plan handled are gone:

1. Drug coverage. Original Medicare doesn't include Part D, and nobody enrolls you in a drug plan automatically. The exception is people with Extra Help, whom CMS reassigns to a stand-alone Part D plan.
2. The out-of-pocket ceiling. Medicare Advantage plans cap yearly spending on covered services. Original Medicare alone has no cap.

The drug part is the one that costs real money. Go 63 days or more in a row without creditable drug coverage and Medicare can add a late enrollment penalty to your future Part D premium for as long as you have Part D: 1% of the base premium ($41.33 in 2027) per uncovered month. Three months without coverage, for example, works out to about $1.20 extra every month after that (Medicare rounds to the nearest 10 cents). Meanwhile you'd pay the pharmacy's full price.

You do get a cushion. Because your plan is the one leaving, a special enrollment period runs December 8, 2026 through February 28, 2027. Still, the clean move is to pick by December 31 so whatever you choose starts January 1. Choosing in January means a February 1 start; February means March 1.

If you also have TRICARE For Life

If you have both TRICARE and Medicare (TRICARE calls this TRICARE For Life), slow down before you change anything, and keep these points from TRICARE's own Medicare page in mind:

• "If you're eligible for both TRICARE and Medicare Part A, then in most cases, you must have Medicare Part B to keep TRICARE." Whatever you do about the ending plan, don't drop Part B.
• TRICARE says you "aren't required to have Medicare Part D to have TRICARE prescription drug coverage." So a TRICARE beneficiary's drug situation is different from a typical neighbor's, and the Part D warning above may play out differently for you. Confirm with TRICARE before assuming.

Ask TRICARE directly how your choice for 2027 (another Medicare Advantage plan or Original Medicare) would work with your TRICARE coverage. I'm not going to guess on your behalf; the answer depends on your exact status.

Medigap without health questions, for a limited time

If you go back to Original Medicare and don't have TRICARE or other secondary coverage, a Medigap policy is one way to limit what Original Medicare leaves unpaid. Your plan ending gives you a guaranteed issue right under RCW 48.66.055: no medical underwriting, pre-existing conditions covered. The Insurance Commissioner's office says to apply November 1 or later. Apply by December 31 for a January 1 start. The right lapses March 4, 2027, and it doesn't apply if you join another Medicare Advantage plan. Keep the letter and envelope; the insurer may want proof.

Doctors, hospital and getting there

No hospital sits inside Oak Harbor's city limits on the state or federal hospital lists. The county's listed hospital is WhidbeyHealth Medical Center in Coupeville. If you look at another Medicare Advantage plan, confirm that hospital, your primary care clinic and any off-island specialist are in its 2027 network. With Original Medicare, any provider in the U.S. that takes Medicare will do.

For rides, Island Transit has been fare-free since 1987 and also runs paratransit; call (360) 678-7771 to plan a trip to Coupeville or to the Skagit Transit connections at March's Point.

Local and statewide help

• The Center in Oak Harbor, 917 E Whidbey Avenue, 360.675.0311, run by Island Senior Resources, which is also OIC's listed SHIBA sponsor for Whidbey.
• SHIBA: every local listing, Island Senior Resources included, said "Currently not accepting appointments" when we checked on October 26, 2026. Call the statewide SHIBA line, 800-562-6900, 8:30 to 4:30 on weekdays.
• 1-800-MEDICARE (1-800-633-4227), 24 hours a day, 7 days a week, except some federal holidays, and Plan Finder for 2027 drug pricing.

More on the county is on the Island County page, and every statewide rule is in our Washington discontinued-plan guide.

Federal Medicare rules and Washington law are the framework here, TRICARE has its own rules on top, and the notice from your plan sets your dates; double-check with SHIBA, 1-800-MEDICARE or a licensed agent.

Related pages: Washington statewide guide · Island County

Oak Harbor questions answered

Sources

1. U.S. Census Bureau ACS 2020-2024, table B09020
2. WA OFM April 1, 2026 population estimates
3. CMS Medicare Monthly Enrollment, July 2026
4. CMS Hospital General Information
5. WA DES Island County profile
6. TRICARE: Beneficiaries eligible for TRICARE and Medicare
7. Medicare.gov: Part D costs and late enrollment penalty
8. CMS CY2027 MA and Part D Enrollment and Disenrollment Guidance
9. WA OIC: Is your Medicare Advantage plan changing or leaving?
10. RCW 48.66.055
11. Island Transit: How to ride
12. WA Community Living Connections