Medicare Advantage

How Ballwin's Medicare plan choices compare with neighboring St. Louis counties for 2027

Ballwin sits inside one of the larger Medicare markets in Missouri, and where you live in the St. Louis metro can change how many Medicare Advantage plans you can shop. Plan availability is set county by county — so a neighbor a few miles away in a different county may see a different lineup than someone in Ballwin. Understanding that map is a good first step before the Annual Enrollment Period closes on December 7, 2026.

Why your county matters more than your ZIP code

Medicare Advantage and Part D plans are approved and sold by service area, and those service areas are drawn along county lines. That means two people who live 15 minutes apart in the St. Louis metro can see different plan menus if they sit in different counties. Ballwin is in St. Louis County, so the plan list a Ballwin resident sees is the St. Louis County list — not a citywide list.

If you have family members or friends in nearby counties like St. Charles, Jefferson, or Franklin, don't assume their plan is available to you, and don't assume yours is available to them. The right question is always, "What's offered in my county for 2027?"

The Ballwin-area numbers heading into 2027

Here is what the county-level picture looks like for people shopping from Ballwin:

• Medicare Advantage plans available in St. Louis County: 80
• Carriers offering Medicare Advantage with drug coverage (MA-PD) in the area: 11
• Population age 65 and older in the county: about 190,319

Those 80 plans are a mix of HMO, PPO, and special-needs plans across 11 different insurance companies. That's a lot of ground to cover, which is why most people narrow the field by first choosing a plan type (for example, HMO vs. PPO) and then comparing plans that include the doctors, hospitals, and prescriptions they already use.

How to compare across nearby counties

If you're helping a parent in another part of the metro — or thinking about moving — a side-by-side county comparison can be useful. Here is a simple approach:

1. Go to medicare.gov/plan-compare and enter the ZIP code for each county you want to check. 2. Note the total number of Medicare Advantage plans that appear for each county. 3. Note how many carriers show up for each area. 4. Look at whether the doctors and pharmacies you (or your loved one) use are in-network for the plans that come up.

Because the counts change by county, the same insurer may offer more plans in one county than another, or none at all in a third. That's normal, and it's exactly why the plan-comparison tool asks for a ZIP code up front.

Stand-alone Part D in the Ballwin area

If you have Original Medicare and want drug coverage, you'd normally add a stand-alone Part D plan. The Ballwin-area data shows 0 stand-alone Part D plans listed at the county level in this snapshot. That is unusual and worth double-checking directly on medicare.gov or by calling 1-800-MEDICARE before you make a decision, since Part D options do exist across Missouri. A licensed SHIP counselor can also confirm what's currently available in your ZIP code.

Whatever plan you land on, the Part D rules are the same nationwide. For 2026, the maximum deductible is $615 and total out-of-pocket spending on covered drugs is capped at $2,100; for 2027, the maximum deductible is $700 and the out-of-pocket cap is $2,400. The old coverage gap ("donut hole") was eliminated in 2025, so Part D now has three phases instead of four. If your drug costs are uneven month to month, you can also opt in to the Medicare Prescription Payment Plan, which spreads what you owe across the calendar year.

About Star Ratings in the area

CMS publishes Star Ratings each year to help people evaluate plan quality on things like customer service and care coordination. In the Ballwin area's data for this snapshot, 0 contracts are rated 4 stars or higher. Ratings can shift year to year and aren't the only factor in a good match — network, drug list, and total costs matter too — but it's worth knowing where a plan stands before you enroll. You can see current ratings on medicare.gov.

Deadlines to keep on your calendar

• October 15 – December 7, 2026: Annual Enrollment Period. You can join, switch, or drop a Medicare Advantage or Part D plan for 2027.
• January 1 – March 31: Medicare Advantage Open Enrollment Period. If you're already in a Medicare Advantage plan, you get one chance to switch to another MA plan or return to Original Medicare (and add a Part D plan).
• Income above $109,000 (single filer, 2026): IRMAA surcharges begin to apply to Part B and Part D premiums.