Medicare 2026

GLP-1 Diabetes Drugs Under Part D in 2027: What to Know About Prior Authorization, Tiers and the $2,400 Cap

If you take a GLP-1 medication like Ozempic, Rybelsus, Mounjaro, Trulicity, Wegovy or Zepbound, you probably have questions about how Medicare's drug coverage works in 2027. Here's a plain-English walkthrough of what Part D does and doesn't cover for these drugs, how costs are structured, and the rules you may run into at the pharmacy counter.

Which GLP-1 drugs Part D can cover

Part D plans can cover GLP-1 medications when they are prescribed for a medically accepted use other than weight loss. That includes:

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

Coverage for weight loss alone is not a Part D benefit. If you already get a GLP-1 through your Part D plan, or you have type 2 diabetes, moderate-to-severe sleep apnea, or fatty liver disease, your drug plan should cover a GLP-1 to treat that condition when it's on the formulary and plan rules are met.

Tiers, prior authorization and other utilization rules

Every Part D plan groups covered drugs into tiers. A higher tier generally means a higher copay or coinsurance. GLP-1 drugs are often placed on a specialty or higher-cost tier, and plans frequently apply additional rules:

• Prior authorization: Your prescriber may need to submit documentation showing the drug is being used for a covered condition — most often type 2 diabetes — before the plan will pay.
• Step therapy: The plan may ask you to try one medication first before approving another.
• Quantity limits: The plan may cap how many doses you can get in a given period.

If a request is denied, you have the right to appeal. Your plan is required to tell you how, and the process is explained on Medicare.gov.

What costs look like in 2027

A few national Part D rules apply across the country in 2027:

• $2,400 out-of-pocket cap. After your spending on covered Part D drugs reaches $2,400, you pay $0 for covered drugs for the rest of the calendar year. (For comparison, the cap is $2,100 in 2026.)
• Deductible. The most a plan may charge as a deductible in 2027 is $700. Many plans charge less; some charge none.
• Base beneficiary premium. The national base beneficiary premium used in the late-enrollment penalty calculation is $41.33. Actual plan premiums are set plan by plan and vary.

Specific plan premiums, copays and coinsurance differ, so check the plan's own documents for your situation.

Negotiated prices for Ozempic and Rybelsus

Starting January 1, 2027, Medicare's negotiated price for a 30-day supply of Ozempic or Rybelsus is $274, down from a 2024 list price of $959. What you personally pay still depends on your plan's cost sharing — the deductible, your tier, and whether you've reached the $2,400 cap. The negotiated price is the amount the plan uses as the basis for your share.

Spreading costs across the year

If a GLP-1 fill produces a big up-front bill early in the year, you can opt in to the Medicare Prescription Payment Plan. It lets you pay your out-of-pocket drug costs in monthly amounts instead of all at once at the pharmacy. It does not reduce what you owe — it just smooths the timing. You can enroll through your Part D plan.

When you can enroll or change plans

• Annual Enrollment (Open Enrollment) runs October 15 through December 7, 2026, with changes effective January 1, 2027.
• People with Medicaid or Extra Help have a monthly Special Enrollment Period (available since 2025) to move to Original Medicare with a stand-alone Part D plan, or to switch stand-alone Part D plans.
• Full-benefit dual-eligible individuals can join an integrated D-SNP in any month.

Coverage path: a neutral comparison

Many people getting a GLP-1 compare two paths:

• Medicare Advantage with Part D: Medical and drug coverage are bundled. Networks and prior authorization apply, and plans often include extra benefits. Costs and rules vary.
• Original Medicare + a stand-alone Part D plan (often with Medigap): You can see any provider that accepts Medicare. Medigap can help with Part A and B cost sharing; Part D is a separate plan with its own formulary and rules. Medigap premiums and underwriting rules depend on your situation.

Neither path is universally better — the right fit depends on your drugs, doctors, budget and preferences.

A note on 2027 numbers still to come

The 2027 Part B standard premium and deductible, and the IRMAA income brackets and surcharges, had not been announced at the time of writing. CMS typically announces them in the fall. The Social Security Administration announced a 3.6% cost-of-living adjustment for benefits payable starting January 2027.

Where can you get help with Medicare questions?

For official rules, plan comparisons and enrollment, visit Medicare.gov or call 1-800-MEDICARE (1-800-633-4227), TTY 1-877-486-2048, 24 hours a day, 7 days a week. This article is educational and independent — not from the government — and is not a recommendation of any specific plan.