Did a letter about your Medicare Part D drug coverage land in your mailbox lately? Plenty of seniors are in the same boat, unsure and a bit anxious about what it means. The Part D market is getting smaller quickly. In 2026 there will be only 360 standalone prescription drug plans, down from 464 in 2025, and the fewest since the program started.
So what does that mean for you? Will your plan still be around? Will your medicines cost more? The sections below answer those questions.
Why Are So Many Plans Going Away?
The drop in Part D plans did not happen all at once. It has been building for several years. Here is what is driving it.
The Effect of the Inflation Reduction Act
The Inflation Reduction Act (IRA), passed in 2022, reshaped the drug plan market. Since it took effect, the number of plans has fallen by 55%, from 804 plans in 2023 to just 360 for 2026.
The law put more of the financial burden on insurers. Plans now have to pick up more of the cost for people who take expensive medicines. Many insurers concluded the business was no longer profitable enough, and smaller companies were pushed out altogether.
Big Insurers Pulling Out
Several well-known insurers have left the Part D market completely. Cigna sold its Medicare business and no longer sells standalone drug plans. Clear Spring Health and Mutual of Omaha left in 2025. Elevance Health cut back sharply, going from six plans in 20 regions to two plans in one region each.
WellCare, which is now part of Centene, trimmed its lineup too. It dropped the Wellcare Medicare Rx Value Plus plan and will sell only two plans in 2026.
Fewer Companies, More Control
Five companies now dominate Part D: Aetna, Health Care Service Corporation, Humana, UnitedHealthcare and Wellcare. Between them they will run 94% of all Part D plans in 2026. Less competition means fewer choices when you shop and less pressure on plans to keep prices low.
What Else Is Changing in 2026?
The shrinking number of plans is not the only change. Other shifts will affect your coverage and what you pay.
Preferred Pharmacy Networks Are Disappearing
For years, preferred cost-sharing pharmacy networks were a standard part of Part D plans. They are now fading fast. In 2023, 98% of plans had one. In 2026, only 79% will, the lowest share since 2014.
Without a preferred network, your copays at the pharmacy you normally use could go up. You may have to change pharmacies to keep costs down.
Higher Costs Even Where Premiums Fall
This may come as a surprise: many Part D premiums are actually going down in 2026. But the premium is only one part of what you pay.
Other costs are rising. Deductibles are climbing in many plans, and more plans are charging coinsurance rather than a flat copay for brand-name drugs. So even with a lower monthly premium, you could end up paying more out of pocket.
Formulary Changes
Insurers are also changing which drugs they cover. Some medicines may move to higher tiers with steeper cost-sharing, and others may be dropped from the formulary entirely. Check whether your plan still covers each of your prescriptions.
Who Will Feel These Changes Most?
The shrinking Part D market hits some people harder than others.
Seniors Living in Rural Areas
Rural residents already had fewer plans to pick from. As plans disappear, their choices narrow even further, which can leave rural seniors without coverage that meets their needs.
People With Medigap Policies
Many seniors pair Original Medicare with a Medigap supplement policy and then add a standalone Part D plan for prescriptions. With fewer Part D plans on the market, finding one that fits gets harder.
Members of Employer Group Plans
Some retirees get drug coverage through custom employer plans that are built on Part D. The market's collapse hits these arrangements directly, so employer coverage could become more costly or less complete.
What to Do Now
Do not wait until the last minute to deal with these changes. Acting early can save you money and hassle.
Read Your Annual Notice of Change
Your plan should mail you an Annual Notice of Change, usually in September or October. It lays out any changes to your coverage for 2026. Read it closely. It will tell you whether your plan is being discontinued and explain changes to costs, formularies and pharmacy networks.
Try Medicare's Plan Finder
Medicare has a Plan Finder tool at Medicare.gov that lets you compare every plan offered in your area. Enter your medications to see which plans cover them best. Be careful, though. Some people have found mistakes in the tool, so confirm key details by calling the plans yourself.
Think About Your Medications
Write down every prescription you take, with the dose and how often you take it, and use that list to compare plan formularies. Watch the tier each drug is on. The same medicine costs less on Tier 2 than on Tier 4, and that can make a big difference over a year.
Mind the Deadline
Medicare's Annual Enrollment Period runs from October 15 to December 7 every year. If your plan is going away, you must sign up for a new one by December 31.
Miss it and you could start January 1, 2026 with no drug coverage, which would mean paying full price for every prescription.
Looking Ahead
The Part D market is clearly in trouble. Only seven national insurers still sell standalone drug plans, and the situation remains shaky. Some experts fear the market could shrink even more.
For now, people on Medicare have to adjust. That means checking your coverage every year and keeping up with policy changes so you can make good decisions.
The reassuring part is that Part D is not going away. You will just have to work harder to find the right plan, and with fewer options, comparing plans matters more than ever.
Do not let these changes take you by surprise. Get ahead of your prescription coverage now: look at your options, ask questions and choose carefully. Your health and your budget will be better for it.
