Medicare Part D — the voluntary prescription drug benefit available to all Medicare beneficiaries — underwent the most significant structural changes in its 20-year history in 2025 and 2026, driven by the Inflation Reduction Act (IRA) provisions phased in over multiple years. In 2026, beneficiaries will see a new $2,100 annual out-of-pocket cap, a $615 annual deductible (for plans charging the standard deductible), and one of the most anticipated changes yet: Medicare’s ability to cover GLP-1 weight loss medications including semaglutide (Wegovy) at a maximum $50 per month cost-sharing for eligible beneficiaries starting July 2026.
Understanding these changes is essential for the more than 50 million Americans enrolled in Medicare Part D — whether through a standalone Prescription Drug Plan (PDP) or a Medicare Advantage plan with drug coverage (MA-PD). This guide explains every major Part D change for 2026 using official data from CMS, AARP, and Kiplinger.
Disclaimer: Drug coverage details vary by plan. This article provides general educational information. For plan-specific coverage and formulary information, visit medicare.gov or contact your specific plan.
Medicare Part D in 2026: The Key Changes at a Glance
| Part D Feature | 2025 | 2026 | What It Means |
|---|---|---|---|
| Annual deductible (standard max) | $590 | $615 | You pay up to $615 before coverage begins |
| Out-of-pocket cap | $2,000 | $2,100 | After $2,100 OOP, you pay $0 for covered drugs |
| Catastrophic phase | $0 after $2,000 OOP | $0 after $2,100 OOP | No cost after cap is reached |
| GLP-1 drug coverage | Not covered for weight loss | $50/month max from July 2026 | Major new access for obesity treatment |
| Medicare drug negotiation | Not yet in effect | 10 drugs negotiated; savings begin Jan 2026 | Lower costs on 10 key drugs |
The $2,100 Out-of-Pocket Cap: What It Means
How the Cap Was Created
Before the Inflation Reduction Act, Medicare Part D had no hard cap on out-of-pocket drug costs. Beneficiaries with high drug costs could pay thousands of dollars per year. The IRA introduced the $2,000 OOP cap in 2025 and adjusted it to $2,100 for 2026 through standard inflation indexing. This is one of the most significant consumer protection changes in Medicare Part D history.
How It Works in Practice
The $2,100 cap tracks your out-of-pocket spending on covered Part D drugs throughout the calendar year — including your annual deductible and cost-sharing at each drug tier. Once you have paid $2,100 in qualifying costs, you enter the catastrophic coverage phase and pay $0 for covered drugs for the remainder of the year. The cap resets January 1 each year.
For beneficiaries with expensive specialty medications — particularly those treating cancer, hepatitis C, multiple sclerosis, or rheumatoid arthritis — the cap provides meaningful financial protection previously unavailable. Some patients who previously spent $5,000 to $10,000 or more annually will now reach the cap and pay nothing for the rest of the year.
GLP-1 Coverage Under Medicare Part D Starting July 2026
Perhaps the most anticipated Part D change for 2026 is the expansion of Medicare coverage to include GLP-1 receptor agonist medications — including semaglutide (Wegovy) and tirzepatide (Zepbound) — for weight management in beneficiaries with obesity. This coverage begins July 1, 2026, following CMS’s finalization of the rule in late 2025.
Under the new coverage, Medicare beneficiaries with a BMI of 30 or higher (or 27+ with at least one weight-related condition) who receive a GLP-1 prescription for chronic weight management from a qualified provider will access these medications through their Part D plan with a maximum $50 per month cost-sharing after deductibles are met. According to AARP’s February 2026 analysis, approximately 3.4 million Medicare beneficiaries are expected to be eligible. Beneficiaries should check with their specific Part D plan before July 2026 to understand formulary inclusion and applicable cost-sharing.
Medicare Drug Price Negotiation: 10 Drugs With Lower Prices in 2026
The Inflation Reduction Act authorized Medicare to directly negotiate drug prices with manufacturers for the first time. The first round of negotiations, completed in 2024 for 10 high-cost drugs, produced agreed prices taking effect January 1, 2026. According to CMS and AARP analysis, these negotiated prices represent discounts ranging from 38 to 79 percent below previous Medicare prices.
| Drug (Brand Name) | Condition Treated | Price Reduction |
|---|---|---|
| Eliquis (apixaban) | Blood clots, atrial fibrillation | ~56% reduction |
| Jardiance (empagliflozin) | Type 2 diabetes, heart failure | ~66% reduction |
| Xarelto (rivaroxaban) | Blood clot prevention | ~62% reduction |
| Januvia (sitagliptin) | Type 2 diabetes | ~79% reduction |
| Farxiga (dapagliflozin) | Type 2 diabetes, heart failure | ~68% reduction |
| Entresto (sacubitril/valsartan) | Heart failure | ~53% reduction |
| Enbrel (etanercept) | Rheumatoid arthritis, psoriasis | ~67% reduction |
| Imbruvica (ibrutinib) | Blood cancers | ~38% reduction |
| Stelara (ustekinumab) | Psoriasis, Crohn’s disease | ~66% reduction |
| Fiasp/NovoLog (insulin aspart) | Type 1 and 2 diabetes | ~76% reduction |
Extra Help (Low Income Subsidy) in 2026
The Extra Help program — also called the Low Income Subsidy (LIS) — helps Medicare beneficiaries with limited income and resources pay Part D premiums, deductibles, and cost-sharing. In 2026, Extra Help eligibility was expanded under the Inflation Reduction Act, with the income threshold raised to 150 percent of the Federal Poverty Level (approximately $22,590 for an individual in 2026).
Beneficiaries who qualify for full Extra Help pay no Part D premium (if they choose a qualifying plan), no deductible, and nominal cost-sharing of $1.10 to $3.30 for generics and $4.50 for brand-name drugs. Apply through the SSA at ssa.gov/extrahelp or by calling 1-800-772-1213.
Choosing or Changing Your Part D Plan
Medicare’s annual Open Enrollment Period runs October 15 through December 7 each year. The Medicare Plan Finder at medicare.gov/plan-compare is the official tool for comparing Part D plans by premium, deductible, and the specific drugs you take. Entering your current medications allows the tool to calculate your estimated total annual cost — premium plus expected drug costs — for every available plan in your area. CMS recommends reviewing your plan coverage annually because formularies, tier placements, and costs change each year even if you do not change plans.
Frequently Asked Questions
Does every Medicare Part D plan have a deductible?
No. The $615 deductible is a maximum — individual plans may charge less or no deductible. Plans with a lower deductible typically offset this with higher monthly premiums. When comparing plans, calculate total annual cost (premium plus expected drug costs) rather than evaluating premium or deductible in isolation.
Can I use GoodRx with Medicare Part D?
You can use GoodRx discounts, but you cannot combine them with Medicare Part D coverage for the same prescription. If you use a GoodRx discount, that purchase does not count toward your Part D deductible or out-of-pocket cap. For expensive drugs, Medicare Part D coverage almost always provides better value than cash-pay discount programs once annual costs are considered.
What happens to my Part D coverage when I travel?
Most standalone Part D plans provide coverage only at network pharmacies. When traveling, use the plan’s preferred pharmacy network or ask about out-of-network cost-sharing. Some Part D plans offer nationwide preferred pharmacy networks. Medicare Advantage drug plans may have more geographic restrictions on coverage.
Sources
- Centers for Medicare and Medicaid Services — cms.gov — 2026 Medicare Part D parameters and GLP-1 coverage rule. Available at: https://www.cms.gov/medicare/prescription-drug-coverage/prescriptiondrugcovgenin
- AARP — aarp.org — Medicare Part D changes 2026 analysis, February 2026. Available at: https://www.aarp.org/health/medicare-insurance/info-2026/medicare-part-d-changes.html
- Kiplinger — kiplinger.com — Medicare Part D 2026 changes and drug negotiation analysis. Available at: https://www.kiplinger.com/retirement/medicare/medicare-part-d-changes-2026
- Medicare.gov — medicare.gov/plan-compare — Official Medicare plan comparison tool. Available at: https://www.medicare.gov/plan-compare
