Medicare 2026

Why Medicare Part D Doesn't Cover Weight-Loss Drugs — and What the GLP-1 Bridge Changes Through 2027

If you've been reading about GLP-1 medications like Wegovy, Zepbound, Ozempic or Mounjaro and wondering why Medicare won't pay for them when you want to lose weight, you're not alone. The short answer is that federal law has excluded weight-loss drugs from Part D since the program began in 2006. The slightly longer answer, which matters a lot right now, is that a temporary Medicare demonstration called the GLP-1 Bridge is filling part of that gap through December 31, 2027.

Here's what the rules say, what the Bridge covers, and how to think about it as you look at Part D for the coming year.

The law behind the exclusion

When Congress created Part D, the statute specifically excluded several categories of drugs from coverage, and "agents when used for weight loss" was one of them. That exclusion has been in place since 2006 and still applies today. It isn't a decision individual Part D plans make — it's a federal rule every plan must follow.

That's why two people taking the same medication can have very different coverage outcomes under Part D. The deciding factor is the medical reason on the prescription, not the drug itself.

What Part D plans can cover

Part D plans are allowed to cover GLP-1 drugs for medically accepted uses other than weight loss. In practical terms:

• Ozempic, Rybelsus, Mounjaro and Trulicity are approved to treat type 2 diabetes.
• Wegovy is also approved to lower the risk of heart attack and stroke in adults who have known heart disease along with obesity or overweight.
• Zepbound is also approved for moderate-to-severe obstructive sleep apnea in adults with obesity.

Coverage still depends on the plan's formulary and its rules, which often include prior authorization and step therapy. If your prescriber is treating one of these conditions, ask the plan what documentation it needs so the pharmacy claim goes through smoothly.

What the GLP-1 Bridge is

The Medicare GLP-1 Bridge is a temporary CMS demonstration — meaning it runs outside your regular Part D plan — that covers certain GLP-1 drugs prescribed specifically for weight loss. It runs from July 1, 2026 through December 31, 2027.

Key details to know:

• You pay a $50 copay at the pharmacy for a one-month supply (28 or 30 days). The Bridge does not allow 60- or 90-day fills.
• The Part D deductible does not apply to Bridge prescriptions.
• The $50 does not count toward your Part D deductible or toward the Part D out-of-pocket cap.

In April 2026, CMS announced it would not launch its planned BALANCE model for GLP-1 drugs inside Part D in 2027, because too few Part D plans applied. CMS extended the Bridge through the end of 2027 and has not yet announced what, if anything, will follow it after that date.

How the Bridge fits with the rest of Part D in 2027

Even though the Bridge sits outside your plan, your regular Part D coverage still runs normally alongside it. For 2027, two program-level numbers are worth keeping in mind:

• The Part D out-of-pocket cap is $2,400 (it is $2,100 in 2026). Once your true out-of-pocket spending on covered Part D drugs reaches that cap, you pay $0 for covered drugs the rest of the year.
• The most any Part D plan may charge as a deductible is $700. Plans can charge less, but not more.

The Part D base beneficiary premium for 2027 is $41.33, a national figure used to calculate the late-enrollment penalty; what each plan charges in monthly premium is set plan by plan.

The 2027 Part B standard premium and deductible, and the 2027 IRMAA income brackets, had not been announced as of this writing. CMS typically releases those figures in the fall, so check Medicare.gov for the official numbers when they're posted.

Social Security announced on October 14, 2026 a 3.6 percent COLA for benefits payable beginning January 2027.

When you can make changes

Annual Enrollment for 2027 runs October 15 – December 7, 2026, with new choices taking effect January 1, 2027. That's the main window to compare Part D plans, join one, or switch.

If you have Medicaid or Extra Help, you have a monthly Special Enrollment Period that lets you move to Original Medicare with a stand-alone Part D plan, or switch stand-alone Part D plans, once per month. If you're a full-benefit dual-eligible, you can join an integrated D-SNP in any month of the year.

Original Medicare + Medigap vs. Medicare Advantage

Both paths include Part D access (either through a stand-alone Part D plan with Original Medicare, or built into most Medicare Advantage plans). Each has trade-offs:

• Original Medicare with a Medigap policy and a stand-alone Part D plan generally offers broad provider access and predictable cost-sharing on the medical side, but Medigap premiums are an additional monthly cost and underwriting rules can apply depending on when you apply.
• Medicare Advantage often bundles medical and drug coverage and may include extras, but typically uses provider networks and plan-specific rules like prior authorization.

Neither path changes the weight-loss drug exclusion or the Bridge rules — those apply across Medicare.

Where to get official information

For current plan details, formularies, and the most up-to-date figures as CMS releases them, use the official sources:

• Medicare.gov — plan finder, formulary lookup, and the official rules for Part D and the GLP-1 Bridge.
• 1-800-MEDICARE — available 24/7 to answer questions about your situation.

The weight-loss exclusion is set in law, but the Bridge gives many people a defined, temporary path to coverage through 2027. Knowing which bucket your prescription falls into — weight loss, diabetes, cardiovascular risk reduction, or sleep apnea — is the single most useful thing you can do before you talk to your plan or your pharmacist.