Medicare Advantage Plans in St. Louis County, Missouri: 2026 Guide

As of 2026, 100% of Missouri residents with Medicare will have access to a Medicare Advantage plan with a $0 monthly premium.¹ St. Louis, the largest Metropolitan area in Missouri, is home to a diverse community with a wide range of healthcare needs. If you're a resident, it's essential to be informed about the Medicare Advantage plan options available to you. 

Medicare Advantage plans, also known as Medicare Part C, offer an alternative to Original Medicare. These plans are legally required to provide the same coverage as Original Medicare but often include additional routine benefits, such as dental, vision, or hearing, as well as prescription drug coverage.

What do St. Louis Medicare Advantage plans cover?

Enrolling in a Part C plan replaces the way you receive your Original Medicare benefits. Your plan is administered under a private insurance carrier, rather than the federal government. This transition streamlines your healthcare under a single private plan while retaining all fundamental consumer protections guaranteed by federal law.

Hospital and Medical Coverage (Parts A and B)

Every Medicare Advantage plan in St. Louis includes coverage for inpatient hospital stays (Part A) and outpatient medical services (Part B). You maintain coverage for emergency care, surgeries, diagnostic testing, and hospital admissions across major local hospital networks, including world-class health facilities like Barnes-Jewish Hospital and St. Luke's Hospital.

Prescription Drug Coverage (Part D)

Medicare Advantage plans that include prescription drug coverage are known as Medicare Advantage Prescription Drug (MAPD) plans. Under the Inflation Reduction Act, these plans offer financial protections for out-of-pocket spending:

• 2026 Out-of-Pocket Cap: In 2026, out-of-pocket prescription drug spending under Part D is strictly capped at $2,100 per year. Once you reach this limit, you pay $0 for covered formulary drugs for the rest of the calendar year.

• 2027 Out-of-Pocket Cap: The federal out-of-pocket prescription drug cap is scheduled to increase to $2,400 in 2027 (with the standard deductible rising to $700). Beneficiaries should review their plan’s Annual Notice of Change (ANOC) sent each fall to track potential formulary and cost adjustments.

Be aware that enrolling in a separate, standalone Medicare Part D prescription drug plan will automatically disenroll you from your Medicare Advantage plan and return you to Original Medicare.

Additional Routine Benefits

In contrast to Original Medicare, Medicare Advantage plans may offer additional benefits that help lower out-of-pocket spending on routine care, such as dental, vision, and hearing, as well as over-the-counter allowances and fitness memberships.

The Average Cost of Medicare Advantage in St. Louis (2026)

While plan structures vary, Medicare Advantage plans in St. Louis are designed to provide predictable out-of-pocket spending.

Source: Medicare Plan Finder Tool

Note: Selecting a $0 premium Medicare Advantage plan does not eliminate all costs. You must continue paying your monthly Medicare Part B premium ($202.90 standard in 2026) to remain enrolled in Part C. 

Types of Medicare Advantage Plans in St. Louis (HMO vs. PPO)

Medicare Advantage plan performance in the St. Louis metro depends heavily on provider networks. The two most common plan structures include:

• Health Maintenance Organization (HMO): HMO plans generally feature lower monthly premiums and co-pays but require you to receive care within a strict local network (e.g., the SSM Health or BJC HealthCare network). Out-of-network care is generally covered only in emergency situations, and specialist visits typically require a primary care referral.

• Preferred Provider Organization (PPO): PPO plans offer broader flexibility, allowing you to visit out-of-network specialists without a primary care referral. However, using out-of-network doctors generally results in higher out-of-pocket co-pays or coinsurance.

When can you enroll in or switch plans in Missouri?

You can only enroll in or make changes to a Medicare Advantage plan during specific Medicare enrollment windows:

• Initial Enrollment Period (IEP): A seven-month window surrounding your 65th birthday (three months before, the month of, and three months after).

• Annual Enrollment Period: Runs from October 15 to December 7 each year. Changes made during AEP take effect on January 1.

• Medicare Advantage Open Enrollment Period: Runs from January 1 to March 31. If you are already enrolled in a Medicare Advantage plan, you can switch to a different MA plan or drop back to Original Medicare during this period.

• Special Enrollment Periods: Available if you experience specific qualifying life events, such as moving out of St. Louis County, losing employer health coverage, or qualifying for low-income assistance like Medicaid (MO HealthNet).

Other Plans that May be Available in St. Louis, Missouri 

While we can help you check your enrollment eligibility and compare Medicare Advantage plans that may be available in St. Louis, we also may be able to help you find and compare available Medicare Supplement plans and Prescription Drug plans (Part D). 

Medicare Supplement plans, also known as Medigap plans, help cover gaps in coverage from Medicare Part A and Part B, such as deductibles, coinsurance, and copayments. In most states, there are ten Medicare Supplement plans to choose from, and all policies have been standardized, meaning there’s no difference in the benefits offered between Medicare Supplement insurers. 

Medicare Prescription Drug plans, also known as Medicare Part D, help cover the cost of both generic and brand-name medications. If you are already enrolled in Original Medicare (Part A and Part B), enrolling in a prescription drug plan will give you broader healthcare coverage and may even save you money. A Medicare Part D plan can be purchased as a standalone plan to supplement Original Medicare or to accompany a Medicare Supplement plan. 

See if You’re Eligible to Compare Medicare Advantage Plans in St. Louis with The Medicare Helpline

Navigating the complexities of Original Medicare and Medicare Advantage plans can be confusing, but we can help make it simple. If you’re new to Original Medicare, on Medicare but recently moved, or lost your health insurance, click the “Get a Free Quote” button below to see if you qualify for a free, no-obligation Medicare Advantage plan review with a licensed insurance agent for available plan options in St. Louis.