Medicare Part D covers Gemtesa, but only if your plan includes it and you meet the plan's cost-sharing rules
Gemtesa (mirabegron) is a prescription medication used to treat overactive bladder. Medicare Part D — the prescription drug coverage part of Medicare — does cover Gemtesa, but whether you pay nothing, a copay, or coinsurance depends on which Part D plan you have and which tier the drug sits on within that plan. Not every Part D plan covers Gemtesa the same way, and some plans may require you to try a different medication first before they will pay for it.
The cost you actually pay also depends on which stage of the Part D benefit year you are in. Early in the year, you pay a copay or coinsurance. Once you reach a certain spending threshold, you enter the coverage gap (sometimes called the "donut hole"), where your out-of-pocket costs rise. After you spend enough out of pocket, catastrophic coverage kicks in and your costs drop again.
Key Takeaways
- Gemtesa is covered by Medicare Part D, but the amount you pay depends on your specific plan and which tier the drug is on.
- Some Part D plans may require prior authorization or a step therapy (trying another drug first) before they will cover Gemtesa.
- Your copay or coinsurance for Gemtesa changes depending on which stage of the benefit year you are in — early coverage, the coverage gap, or catastrophic coverage.
- You can check your plan's formulary (the list of covered drugs) on your plan's website or by calling the plan's customer service number on the back of your card.
How to find out what your plan charges for Gemtesa
The first step is to check your Part D plan's formulary. This is the official list of drugs your plan covers and what tier each drug is on. Tier 1 drugs usually have the lowest copay; Tier 2 and Tier 3 drugs cost more; and Tier 4 or Tier 5 drugs (if your plan has them) cost the most. Gemtesa is typically a Tier 3 or Tier 4 drug, meaning it is not the cheapest option but not the most expensive either.
You can find your plan's formulary in three ways. Log into your plan's website and search for "formulary" or "drug list." Call the customer service number on the back of your Medicare card and ask a representative to tell you the tier and copay for Gemtesa. Or visit Medicare.gov, go to the Plan Finder tool, enter your information, and view the formulary for each plan you are considering.
Write down the exact copay or coinsurance percentage for Gemtesa, because this is what you will pay at the pharmacy. Also ask whether your plan requires prior authorization (approval from the plan before the pharmacy fills the prescription) or step therapy (trying a cheaper drug first).
Prior authorization and step therapy requirements
Some Medicare Part D plans require prior authorization before they will cover Gemtesa. This means your doctor's office must contact the plan and get written approval before you fill the prescription. The process usually takes one to three business days, but it can delay your treatment. Ask your doctor's office whether they have submitted a prior authorization request, and if not, ask them to do so.
Other plans use step therapy, which means the plan will only cover Gemtesa if you have already tried and failed to benefit from a cheaper medication — usually another overactive bladder drug like oxybutynin or tolterodine. If your plan has a step therapy requirement and you have not tried the other drug, your doctor will need to document that you tried it first or explain why you cannot take it. This can add weeks to your treatment timeline.
You can ask your plan directly whether Gemtesa requires prior authorization or step therapy. If it does, your doctor can often request an exception if there is a medical reason you need Gemtesa instead of the cheaper alternative.
What Gemtesa costs at different stages of the benefit year
Your out-of-pocket cost for Gemtesa changes as you move through the Part D benefit year, which runs from January 1 to December 31. The benefit year is divided into stages, and your cost-sharing responsibility shifts at each stage.
| Stage | When It Happens | What You Pay |
|---|---|---|
| Initial Coverage | January 1 until you and your plan have spent $5,850 combined (2024 amount; changes yearly) | Your plan's copay or coinsurance for Gemtesa (usually $35–$75 per month depending on tier) |
| Coverage Gap | After combined spending reaches $5,850 until you have paid $3,822 out of pocket (2024 amount; changes yearly) | 25% of the drug's cost, plus a small manufacturer discount |
| Catastrophic Coverage | After you have paid $3,822 out of pocket | 5% of the drug's cost |
During the coverage gap, your cost for Gemtesa rises significantly because you pay 25% of the full price instead of a fixed copay. This is why many people with Part D coverage experience a cost shock in the middle of the year. Once you reach catastrophic coverage, your cost drops to 5% of the drug's price, which is usually much lower than your copay during initial coverage.
Comparing Gemtesa to other overactive bladder medications
Gemtesa is not the only medication for overactive bladder covered by Medicare Part D. Other options include oxybutynin, tolterodine, solifenacin, and darifenacin. These older medications are often on a lower tier (Tier 1 or Tier 2) and cost less than Gemtesa. However, they work differently and may cause more side effects like dry mouth or constipation.
If your plan's copay for Gemtesa is too high, or if the plan requires step therapy, ask your doctor whether one of the cheaper alternatives might work for you. Your doctor can explain the differences in how each drug works and whether switching makes sense for your situation. Do not stop taking Gemtesa or switch medications on your own without talking to your doctor first.
You can also ask your plan whether it offers a patient information program or a copay card from the drug manufacturer. Some pharmaceutical companies offer cards that reduce your copay for Gemtesa, though these programs have income limits and other restrictions.
What to do if your plan does not cover Gemtesa
If your current Part D plan does not cover Gemtesa at all, or if the copay is unaffordable, you have options. You can switch to a different Part D plan during the Annual Enrollment Period (October 15 to December 7 each year). Use the Medicare Plan Finder to compare plans and see which ones cover Gemtesa and at what cost.
If you need Gemtesa before the next enrollment period, talk to your doctor about whether a different overactive bladder medication covered by your plan might work. You can also contact your plan and ask for an exception to their coverage rules. Plans sometimes approve exceptions if your doctor documents that you have tried other medications and they did not work, or that you have a medical reason you cannot take them.
Another option is to ask the pharmacy for the cash price of Gemtesa without using insurance. Generic mirabegron (the active ingredient in Gemtesa) is often much cheaper than the brand name, and the cash price may be lower than your copay. Always compare the cash price to your copay before deciding which to use.
Frequently Asked Questions
Will Medicare Part B cover Gemtesa if I get it as an injection?
Gemtesa is only available as an oral tablet, not as an injection. Part B covers certain injectable medications, but Gemtesa is not one of them. You will need Part D coverage to pay for Gemtesa.
Can I use a GoodRx coupon or discount card instead of my Medicare Part D?
You cannot use a GoodRx coupon or other discount card at the same time as your Medicare Part D coverage. However, you can compare the cash price (with or without a coupon) to your Part D copay and use whichever is cheaper. Ask the pharmacy to run both prices before you pay.
What happens to my Gemtesa coverage if I switch Part D plans mid-year?
You can only switch Part D plans during the Annual Enrollment Period (October 15 to December 7) or if you have a may have access to life event like moving to a new state or losing other coverage. If you switch plans, your new plan's formulary and copay for Gemtesa will explore when ready, and your spending with your old plan does not carry over to the new plan.
Does Medicare Part D cover the cost of the doctor visit to get a Gemtesa prescription?
No. Part D only covers the prescription drug itself. The doctor visit is covered by Part B (if you have it), which pays for 80% of the cost after you meet your deductible. You are responsible for the remaining 20% and any copay your doctor's office charges.
Can I get a 90-day supply of Gemtesa to save money?
Many Part D plans offer mail-order or 90-day supplies at a lower copay than a 30-day supply at the pharmacy. Check your plan's website or call customer service to ask whether a 90-day supply is available and what the copay would be. This can reduce your out-of-pocket costs over time.