Tumwater is younger than the county around it. The Census Bureau's 2020 to 2024 survey puts about 4,200 Tumwater residents at 65 or older, 15.6% of the city (margin of plus or minus 480 people), compared with 18.75% for Thurston County on the same survey. OFM counted 28,030 people in Tumwater on April 1, 2026. A younger city doesn't mean fewer headaches when a Medicare Advantage plan pulls out for 2027, though. It means more of the people opening these letters may be on Medicare for reasons other than age, and the rules treat them a little differently.
Find your row first
The plan ends December 31, 2026 for everybody. What you should do about it depends on who you are:
| If you are... | What matters most for 2027 |
|---|---|
| 65 or older and happy with how Medicare Advantage works | Compare other Medicare Advantage plans in Plan Finder with your Tumwater ZIP and pick by December 31 so it starts January 1. You then get one more change between January 1 and March 31, 2027. |
| 65 or older and ready to leave Medicare Advantage | Pick a separate Part D drug plan, and decide on a Medigap policy while Washington's guaranteed-issue right lasts (apply November 1 or later; it ends March 4, 2027). |
| Under 65 and on Medicare because of a disability | Medigap choices are narrower. Washington's law for departing plans has no age cutoff, but insurers only have to offer what they already sell to new customers. Call SHIBA before deciding. |
| Getting Apple Health or Extra Help | Monthly switches between stand-alone drug plans are allowed, and if you haven't picked coverage when the old plan closes, CMS assigns you a drug plan. |
| Not planning to do anything | January 1 puts you in Original Medicare without drug coverage (Extra Help aside). Choices made through February 28, 2027 still count, just with later start dates. |
Sources: CMS CY 2027 Enrollment and Disenrollment Guidance; RCW 48.66.055; Washington OIC; Medicare.gov.
If you're under 65
CMS doesn't publish Medicare counts for cities, but across Thurston County 6,465 of the 70,541 people on Medicare in July 2026, about 9.2%, qualified through disability rather than age. If you are one of them, here is the honest picture. Federal rules mostly let Medigap companies turn down applicants younger than 65, and CMS's Medigap guide doesn't name Washington among the states that force them to sell to that group. OIC's own line on this is that options for people under 65 on disability are "more limited, but we can help." Scan the OIC's approved Medigap rate sheet and you'll see under-65 pricing from some companies, not all of them.
So for younger enrollees the two roads aren't equal, and it pays to ask before assuming either one works. Call the SHIBA statewide line at 800-562-6900 (weekdays, 8:30 a.m. to 4:30 p.m.) and ask what is sold to under-65 applicants right now. And mark your 65th birthday: with Part B already in place, turning 65 gives you a new six-month stretch to buy Medigap with no health screening.
The January-to-March window isn't for everyone
People hear "you can change plans January through March" and assume it covers them. It is reserved for people sitting in a Medicare Advantage plan when the year starts. If you let the old plan end and default into Original Medicare, that window doesn't help you get back into Medicare Advantage. Your route back is the plan-ending special enrollment period, which opens December 8 and closes February 28, 2027. Requests in January start February 1; requests in February start March 1. I would not plan around either of those. Pick by December 31.
No hospital inside Tumwater
The Department of Health and CMS lists show no hospital with a Tumwater address. Tumwater residents use the two acute-care hospitals in neighboring Olympia, so if you're comparing Medicare Advantage plans, look both up in each plan's 2027 network, then your own clinic and pharmacy. On Original Medicare, any provider that accepts Medicare will do, here or out of state.
Getting to a different clinic costs nothing on Intercity Transit, which doesn't collect fares on buses or Dial-A-Lift. Route 70 connects Tumwater with Lacey. Dial-A-Lift serves addresses within three-quarters of a mile of a fixed route; eligibility depends on whether a disability keeps you from riding the regular bus, and applications take up to 21 days, so apply early if a new doctor is across town (360-705-5896 for certification).
Who to call
Thurston County's SHIBA sponsor is Senior Services for South Sound, working out of the Olympia Senior Center. On October 26, 2026, OIC's local listing for that office said it wasn't booking appointments and sent callers to Medicare's national number. The sponsor's own SHIBA page said phone counselors could be reached at 360-586-6181, ext. 134. Medicare's line, 1-800-633-4227, is staffed 24 hours a day, except some federal holidays. The Lewis/Mason/Thurston Area Agency on Aging is at 360-664-2168. For the full county numbers see our Thurston County page, and for every federal rule in one place, the Washington statewide guide.
The rules here come from federal Medicare law and Washington statute, and the deadlines that bind you are the ones printed in your own plan's letter; if your case doesn't fit neatly, double-check with Medicare's line, SHIBA or a Washington-licensed agent.
Tumwater readers ask
I'm under 65 in Tumwater and losing my plan. Is Medigap an option?
Is there a hospital in Tumwater?
If I ignore my letter, does the spring Medicare Advantage window still help me?
Sources
- U.S. Census ACS 2020-2024, table B09020
- WA OFM April 1, 2026 population estimates
- CMS Medicare Monthly Enrollment, July 2026
- Medicare.gov: Choosing a Medigap Policy (2026)
- Washington OIC: Is your Medicare Advantage plan changing or leaving?
- RCW 48.66.055
- CMS CY 2027 Enrollment and Disenrollment Guidance
- Intercity Transit: Dial-A-Lift eligibility
- Washington OIC: Find a local SHIBA office (checked Oct 26, 2026)
- WA DOH hospital data (HOFIDAR)
