GLP-1 Coverage at Open Enrollment: How to Check a 2027 Plan Before You Pick It

If you use a GLP-1 medicine, Open Enrollment is not the time to ask only one question:

"Does this plan cover GLP-1s?"

That question is too broad.

A plan can cover one GLP-1 but not another. A covered drug can still have prior authorization, step therapy, quantity limits, or a different formulary tier. Your pharmacy can affect what you pay. And for Medicare beneficiaries, the reason the medication is prescribed can determine which coverage pathway applies. [4] [5] [6] [8]

Medicare specifically tells people comparing drug plans to enter the prescriptions they take and compare estimated monthly and annual costs. [2]

For 2027, the better question is:

How will this exact prescription, for this indication, be handled by this exact plan?

That means checking the drug, indication, formulation when relevant, formulary, restrictions, pharmacy, and expected annual cost before you enroll.

Step 1: Write down the exact prescription

Start with the medicine you actually use or expect to use.

For most prescription drugs, knowing the brand and formulation is already useful. For Medicare GLP-1 coverage, it can be particularly important because the reason the drug is prescribed may affect which coverage pathway applies. [8]

Wegovy contains semaglutide. Its current FDA prescribing information includes weight-management indications and a cardiovascular risk-reduction indication for a defined population of adults with established cardiovascular disease and overweight or obesity. [15]

Zepbound contains tirzepatide. Its current FDA prescribing information includes weight management and treatment of moderate-to-severe obstructive sleep apnea in adults with obesity. [16]

Those different indications matter because CMS distinguishes between GLP-1 use for qualifying weight management and certain uses that can be covered through ordinary Medicare Part D. [8]

For example, CMS identifies type 2 diabetes, moderate-to-severe obstructive sleep apnea, certain MASH indications, and Wegovy's cardiovascular indication among circumstances that can involve the Part D pathway rather than the Medicare GLP-1 Bridge. [8]

So "I take Wegovy" or "I take Zepbound" may not tell you enough.

For Medicare, write down:

• the exact drug and brand
• the exact formulation or presentation when relevant
• why it is being prescribed

Formulation can matter

Medicare's current GLP-1 Bridge information demonstrates why the exact product presentation matters.

Medicare currently lists Zepbound KwikPen under the Bridge while stating that single-dose Zepbound vials or pens are not covered through that program. [9]

That means asking whether "Zepbound is covered" can still produce an incomplete answer.

Ask whether your specific Zepbound presentation is covered under the pathway that applies to you.

Step 2: Check the formulary, but do not stop there

Finding your GLP-1 on a formulary is only the beginning.

Medicare drug plans use formularies and can place covered medicines on different tiers. Medicare states that a drug on a lower tier will generally cost less than one on a higher tier. [5]

Plans may also use:

• prior authorization
• step therapy
• quantity limits [4]

Prior authorization can even depend on the medical condition for which the medicine is prescribed. Medicare explains that a drug may be covered for some conditions but require additional approval for others. [4]

So when comparing plans, do not ask only:

Is my GLP-1 on the formulary?

Also ask:

What tier is it on? [5]

Does it require prior authorization? [4]

Does step therapy apply? [4]

Is there a quantity limit? [4]

Does coverage depend on the diagnosis or indication? [4]

For Marketplace coverage through HealthCare.gov, the basic approach is similar. HealthCare.gov tells consumers to review the insurer's prescription list and plan materials and to contact the insurer when needed to verify whether a medicine is covered. [13]

A formulary listing is therefore not the same thing as knowing what you will actually pay or what requirements you will have to satisfy.

Step 3 for Medicare: determine whether Part D or the GLP-1 Bridge applies

For Medicare beneficiaries, this is one of the most important checks for 2027.

CMS states that the Medicare GLP-1 Bridge operates outside the normal Medicare Part D benefit's coverage and payment flow. [7]

It is not simply another Part D formulary tier.

CMS has extended the Bridge through December 31, 2027. [7]

Why the prescription is written matters

CMS states that eligible GLP-1 medicines are furnished through the Bridge when prescribed for a qualifying weight-management indication. [8]

Certain other indications can instead fall under ordinary Part D coverage. [8]

This means two Medicare beneficiaries taking the same active drug could face different coverage pathways depending on why it is being prescribed.

But indication alone does not determine Bridge eligibility.

Medicare also applies separate clinical eligibility requirements for the Bridge. [9]

That is an important distinction during Open Enrollment. Seeing that your medication appears on the Bridge product list does not, by itself, mean that you personally qualify for Bridge coverage.

One part of the 2027 Bridge rules is still unsettled

There is another complication that matters specifically for this Open Enrollment cycle.

As of August 2026, CMS states that it has not yet determined the 2027 lookback period used for one part of the Bridge eligibility process involving previous Part D GLP-1 coverage. [8]

That means some 2027 Bridge eligibility mechanics are still evolving.

If your 2027 coverage strategy depends on the Bridge, do not rely solely on what the rules say today. Check the current Medicare guidance again before making a final enrollment decision and again before assuming Bridge eligibility in 2027.

Step 4 for Medicare: do not mix Bridge costs with Part D costs

Ordinary Part D and the Medicare GLP-1 Bridge also use different payment structures.

For 2027, the defined-standard Medicare Part D deductible is $700, and the annual Part D out-of-pocket threshold is $2,400. [10]

Those are Part D benefit parameters.

CMS states that the GLP-1 Bridge operates outside Part D's coverage and payment flow. Bridge copayments do not count toward Part D true out-of-pocket spending. [7]

So if your GLP-1 is obtained through the Bridge, do not assume those payments are moving you closer to the $2,400 Part D out-of-pocket threshold.

That distinction can materially change how you think about your total prescription spending for the year.

Step 5 for Medicare: compare the whole drug-cost pathway

Do not choose a Medicare drug plan based on premium alone.

Medicare tells people comparing plans to enter their prescriptions and review estimated monthly and yearly costs. [2]

For each candidate plan, look at:

• the premium
• the drug's formulary tier [5]
• prior authorization or other restrictions [4]
• the pharmacy network [6]
• the estimated monthly prescription cost [2]
• the estimated annual prescription cost [2]

Your pharmacy can change the cost

Medicare states that preferred in-network pharmacies may save members money on out-of-pocket drug costs. [6]

Some plans may also require covered prescriptions to be filled through their pharmacy network. [6]

So do not assume that continuing to use your current pharmacy will produce the same price after changing plans.

Check the pharmacy separately for every plan you are seriously considering.

Read your Annual Notice of Change

If you are already enrolled in Medicare coverage, review your Annual Notice of Change before deciding to stay.

Medicare states that the ANOC identifies changes in coverage, costs, and other plan features that will take effect in January. [3]

That matters even if your GLP-1 is covered today.

Current coverage does not establish what the plan will do next year.

Medicare Open Enrollment runs from October 15 through December 7, with changes taking effect January 1. [1]

Use the ANOC as the starting point, then verify your actual prescription against the 2027 plan.

The Medicare Prescription Payment Plan does not lower the price

The Medicare Prescription Payment Plan is another concept that can be confused with drug-cost reduction.

Medicare states that this payment option can help members manage monthly expenses by spreading qualifying Part D out-of-pocket costs over the year. [11]

It does not save money or lower the total cost of the medicine. [11]

It changes the timing of payments.

It does not change the amount ultimately owed.

And because the Medicare GLP-1 Bridge operates outside the ordinary Part D payment flow, Bridge spending should not be assumed to work the same way as covered Part D spending. [7] [11]

Step 6 for Marketplace coverage: verify the drug with the candidate insurer

If you buy insurance through HealthCare.gov, its Open Enrollment period runs from November 1 through January 15. [12]

Those dates apply to HealthCare.gov. State-based Marketplaces may operate differently, so check the Marketplace you actually use.

The Marketplace Open Enrollment schedule has also been the subject of recent federal rulemaking and litigation, so confirm the current dates on HealthCare.gov before relying on the January deadline.

HealthCare.gov directs consumers to review the insurer's prescription list and plan materials to determine whether a medicine is covered. It also recommends contacting the insurer when necessary. [13]

For every Marketplace plan you are considering, check:

• whether the exact GLP-1 is covered [13]
• what restrictions apply [13]
• whether your pharmacy is in network [13]
• what exception process applies if the prescription is not normally covered [13]

HealthCare.gov notes that prescription exception procedures vary by plan. [13]

Do not assume that changing from one Marketplace plan to another preserves the same prescription coverage.

Check the new insurer's rules.

Step 7 for employer Open Enrollment: read next year's plan documents

Employer-sponsored coverage needs a separate review.

The Department of Labor explains that participants in ERISA-covered health plans receive documents including the Summary Plan Description and Summary of Benefits and Coverage. [14]

The SBC is designed to summarize important plan features in plain language, including covered benefits, cost-sharing provisions, and coverage limitations. [14]

Review those documents for 2027 changes.

But do not assume the SBC contains enough information to determine whether your specific GLP-1 is covered.

For prescription-specific questions, obtain the current formulary or other drug-coverage information from the health plan or pharmacy benefit administrator.

There is no single national employer Open Enrollment date, and the sources reviewed for this article do not establish a nationwide rule for employer GLP-1 coverage.

Your employer's actual 2027 plan controls.

Step 8: calculate the annual cost, not just the premium

A low monthly premium does not necessarily mean the lowest annual prescription cost.

Medicare explicitly tells consumers to compare estimated monthly and yearly drug costs across plans. [2]

For ordinary Part D, the drug's formulary tier and the pharmacy you use can affect the amount you pay. [5] [6]

For 2027, remember the defined-standard Part D figures:

$700 deductible. [10]

$2,400 annual out-of-pocket threshold. [10]

But keep the Medicare GLP-1 Bridge separate from that calculation because Bridge claims operate outside the normal Part D payment flow. [7]

If you are considering the Medicare Prescription Payment Plan, treat it as a way to spread eligible costs over time, not as a discount. [11]

The goal is to understand what the prescription is likely to cost you across the whole year.

Your 2027 GLP-1 Open Enrollment checklist

Before selecting a plan, verify each of these.

1. Exact medicine

Write down the drug and brand you actually use or expect to use. [2] [13]

2. Exact formulation when relevant

Do not assume all presentations of the same brand are treated identically. Medicare's current Bridge rules for Zepbound demonstrate why this matters. [9]

3. Why it is being prescribed

For Medicare, the indication can affect whether Part D or another coverage pathway is relevant. [4] [8] [15] [16]

4. Formulary status

Find the actual prescription in the candidate plan's covered-drug information. [5] [13]

5. Tier

Check how the plan classifies the medicine and what that means for cost sharing. [5]

6. Prior authorization

Do not assume that a drug's presence on the formulary means you can fill it without additional approval. [4]

7. Step therapy

Check whether the plan requires another treatment first. [4]

8. Quantity limits

Verify whether the plan limits the amount that can be dispensed. [4]

9. Pharmacy network

Check whether your pharmacy is in network and whether a preferred pharmacy could reduce your cost. [6] [13]

10. Estimated monthly and annual cost

Compare the prescription under each candidate plan, not just the premium. [2]

11. For Medicare, determine the correct coverage pathway

Work out whether the prescription may be covered through ordinary Part D or the Medicare GLP-1 Bridge. [7] [8]

If you are relying on the Bridge, also check the current clinical eligibility rules. [9]

12. Check for unresolved 2027 Medicare rules

CMS has not yet finalized every 2027 Bridge eligibility mechanic. Recheck current guidance before relying on Bridge eligibility. [8]

13. Read your Medicare ANOC

If you already have a Medicare plan, check what changes on January 1. [3]

14. For Marketplace coverage, verify with the specific insurer

Use the candidate plan's own prescription list and rules. [13]

15. For employer coverage, review the actual 2027 materials

Read the SPD, SBC, and notices of benefit changes, then obtain prescription-specific coverage information from the plan or pharmacy benefit administrator. [14]

The bottom line

"Does this plan cover GLP-1s?" is not enough information to make an Open Enrollment decision.

Coverage can depend on the exact medicine, formulary tier, prior authorization requirements, step therapy, quantity limits, pharmacy network, and the condition for which the medication is prescribed. [4] [5] [6] [8]

For Medicare beneficiaries, 2027 adds another question: whether the prescription is handled through ordinary Part D or through the Medicare GLP-1 Bridge. [7] [8]

And because some 2027 Bridge eligibility details are still being finalized, even today's Medicare rules should not be treated as the last word for next year. [8]

The safest strategy is specific:

Write down the exact prescription and why you take it. Check how every candidate plan handles it. Check the restrictions and pharmacy. Compare the estimated annual cost. Then verify the information again before you enroll.

Sources

1. Centers for Medicare & Medicaid Services. What if I want to switch, drop, or rejoin drug coverage? Medicare.gov. Establishes the Medicare Open Enrollment period and effective date of coverage changes.

2. Centers for Medicare & Medicaid Services. Joining a plan. Medicare.gov. Directs Medicare consumers to enter their prescriptions and compare estimated monthly and annual costs.

3. Centers for Medicare & Medicaid Services. Plan Annual Notice of Change (ANOC). Medicare.gov. Establishes the purpose of the ANOC and that changes in coverage and costs take effect in January.

4. Centers for Medicare & Medicaid Services. Drug plan rules. Medicare.gov. Establishes prior authorization, step therapy, quantity limits, and indication-specific utilization-management rules.

5. Centers for Medicare & Medicaid Services. How do drug plans work? Medicare.gov. Establishes formularies, formulary tiers, and the general relationship between tier placement and drug cost.

6. Centers for Medicare & Medicaid Services. What pharmacies can I use? Medicare.gov. Establishes Medicare pharmacy-network and preferred-pharmacy rules.

7. Centers for Medicare & Medicaid Services. Medicare GLP-1 Bridge. Establishes that the Bridge operates outside the Part D benefit's coverage and payment flow, that Bridge copayments do not count toward Part D true out-of-pocket spending, and that the Bridge currently extends through December 31, 2027.

8. Centers for Medicare & Medicaid Services. Information for Part D Plans: Medicare GLP-1 Bridge. Establishes the distinction between qualifying weight-management use through the Bridge and certain Part D-coverable indications and identifies unresolved elements of the 2027 eligibility methodology.

9. Centers for Medicare & Medicaid Services. Weight loss drugs. Medicare.gov. Establishes current GLP-1 Bridge eligibility requirements and product-specific details, including distinctions among Zepbound presentations.

10. Centers for Medicare & Medicaid Services. Announcement of Calendar Year 2027 Medicare Advantage Capitation Rates and Part C and Part D Payment Policies. April 6, 2026. Establishes the 2027 defined-standard Part D deductible and annual out-of-pocket threshold.

11. Centers for Medicare & Medicaid Services. What's the Medicare Prescription Payment Plan? Medicare.gov. Establishes that the payment option spreads qualifying Part D costs over time but does not reduce total drug costs.

12. Centers for Medicare & Medicaid Services. Changing plans: what you need to know. HealthCare.gov. Establishes the HealthCare.gov Open Enrollment period.

13. Centers for Medicare & Medicaid Services. Getting prescription medications. HealthCare.gov. Establishes methods for checking Marketplace prescription coverage, pharmacy networks, and drug-exception procedures.

14. U.S. Department of Labor, Employee Benefits Security Administration. Plan Information. Establishes the role and contents of the SPD and SBC for ERISA-covered employer health plans.

15. U.S. Food and Drug Administration. WEGOVY (semaglutide) prescribing information. Revised June 2026. Establishes Wegovy's FDA-approved cardiovascular risk-reduction indication in a defined adult population.

16. U.S. Food and Drug Administration. ZEPBOUND (tirzepatide) prescribing information. Revised February 2026. Establishes Zepbound's FDA-approved indication for moderate-to-severe obstructive sleep apnea in adults with obesity.