Medicare coverage for Diamox Sequels depends on which part of Medicare you have and whether your doctor prescribes it for a covered condition

Diamox Sequels (acetazolamide) is a prescription medication most commonly used to treat glaucoma, altitude sickness, and certain types of epilepsy. Medicare Part D, which covers prescription drugs, may cover Diamox Sequels if your plan includes it on its formulary — the list of drugs the plan will pay for. However, not every Part D plan covers this medication, and coverage rules vary by plan and by the condition your doctor is treating.

If you have Original Medicare (Part A and Part B) without Part D, you will pay the full cost of Diamox Sequels out of pocket. If you have a Medicare Advantage plan (Part C), prescription drug coverage is usually included, but you need to check your specific plan's formulary to see whether Diamox Sequels is covered.

Key Takeaways

  • Diamox Sequels coverage through Medicare depends on your plan type and whether the medication appears on that plan's formulary.
  • Part D plans may require prior authorization from your doctor before they will pay for Diamox Sequels, especially if it is being prescribed for an off-label use.
  • You can find your plan's formulary by logging into your plan's website, calling the plan's customer service number, or visiting Medicare.gov.
  • If your plan does not cover Diamox Sequels or charges a high copay, you may be able to switch plans during the annual open enrollment period in the fall.
  • GoodRx and other discount programs may offer lower prices than your Medicare copay, though you cannot use both at the same time.

How to check if your Part D plan covers Diamox Sequels

The fastest way to find out is to check your plan's formulary directly. Log into your plan's website using your member ID, or call the customer service number on the back of your Medicare card. Tell them you want to know whether Diamox Sequels is covered and what your copay would be. Have your prescription ready so you can give them the exact dose your doctor prescribed.

You can also search the Medicare.gov Plan Finder tool. Go to Medicare.gov, select "Find Care Providers and Suppliers," then choose "Medicare Plan Finder." Enter your zip code, select your state, and search for your plan by name. Once you find it, you can view the formulary and search for Diamox Sequels by name or by its generic name, acetazolamide.

If you do not have a Part D plan yet and are looking to enroll, you can compare plans in your area using the same Plan Finder tool. The tool will show you which plans cover Diamox Sequels and what the copay would be under each one.

Prior authorization and other coverage limits

Even if your Part D plan includes Diamox Sequels on its formulary, your doctor may need to get prior authorization before the pharmacy can fill your prescription. Prior authorization means your doctor must contact the plan and explain why the medication is medically necessary. This step is most common when Diamox Sequels is being prescribed for a condition that is not its primary FDA-approved use, such as altitude sickness or certain types of headache.

Some plans also place Diamox Sequels on a higher tier, which means you pay a higher copay than you would for a generic or preferred drug. If your plan requires prior authorization or charges a high copay, your doctor can request an exception. The plan may agree to cover the drug at a lower tier or without prior authorization if your doctor provides medical justification.

The process for requesting an exception usually takes 24 to 72 hours. Your doctor's office can submit the request, or you can contact your plan directly and ask how to file an appeal.

What to do if your plan does not cover Diamox Sequels

If your current Part D plan does not cover Diamox Sequels, you have several options. The first is to wait for the annual open enrollment period, which runs from October 15 to December 7 each year. During this time, you can switch to a different Part D plan or Medicare Advantage plan that does cover the medication. You can use the Plan Finder tool to see which plans in your area include Diamox Sequels on their formulary.

If you need the medication before open enrollment, you can ask your doctor whether there is an alternative medication that your plan does cover. Your doctor may be able to prescribe a different glaucoma medication, for example, that your plan will pay for.

You can also pay out of pocket and use a discount program. GoodRx, SingleCare, and RxSaver are free tools that show you the lowest prices at pharmacies near you. Sometimes the discount price is lower than your Medicare copay, but you cannot use both your Medicare coverage and a discount program at the same time — you have to choose one.

How much Diamox Sequels typically costs

The cost of Diamox Sequels varies widely depending on your plan, your copay tier, and your pharmacy. Under Medicare Part D, copays usually range from $15 to $50 per month for a 30-day supply, but this depends on your specific plan and whether the drug is on a preferred or non-preferred tier. Some plans charge a percentage of the cost (coinsurance) instead of a flat copay.

Without insurance, Diamox Sequels can cost $100 to $300 or more per month, depending on the dose and the pharmacy. This is why checking your plan's coverage and comparing discount prices is important if you are facing a high copay.

Once you reach the coverage gap (also called the "donut hole") in your Part D plan, you will pay a higher percentage of the drug cost until you reach the catastrophic coverage threshold. The exact amounts change each year, so check your plan's summary of benefits for the current year's thresholds.

Medicare Advantage plans and Diamox Sequels

If you have a Medicare Advantage plan (Part C), prescription drug coverage is usually built in. However, each Medicare Advantage plan has its own formulary, so coverage for Diamox Sequels varies by plan. Some plans cover it with a low copay, while others may not cover it at all or may require prior authorization.

To find out whether your Medicare Advantage plan covers Diamox Sequels, check your plan's formulary the same way you would for a Part D plan — log into your plan's website, call the number on your card, or use the Medicare Plan Finder tool. If your current plan does not cover the medication, you can switch to a different Medicare Advantage plan during open enrollment.

Original Medicare and Diamox Sequels

If you have Original Medicare (Part A and Part B) without a Part D plan or Medicare Advantage plan, Medicare does not cover prescription drugs. You will pay the full cost of Diamox Sequels out of pocket. This is one reason many people with Original Medicare choose to add a Part D plan or switch to a Medicare Advantage plan that includes drug coverage.

If you have Original Medicare and do not have drug coverage, you can enroll in a standalone Part D plan during the annual open enrollment period or during a special enrollment period if you lose coverage. You can also enroll in a Part D plan when you first become may be able to access for Medicare, during your initial enrollment period.

Frequently Asked Questions

Will Medicare pay for Diamox Sequels if my doctor prescribes it for altitude sickness?

Medicare Part D may cover Diamox Sequels for altitude sickness, but it depends on your plan and whether your doctor can get prior authorization. Altitude sickness is not the primary FDA-approved use of the drug, so some plans require your doctor to justify the prescription. Contact your plan to ask whether they cover this use, or have your doctor request prior authorization.

Can I use a GoodRx coupon instead of my Medicare coverage?

Yes, but you have to choose one or the other — you cannot use both at the same time. If the GoodRx price is lower than your Medicare copay, you can pay cash and use the coupon. However, using a discount program instead of your insurance does not count toward your Part D deductible or out-of-pocket maximum, so it may cost you more in the long run if you take other medications.

What happens if I switch Medicare plans mid-year?

You can only switch Medicare plans during the annual open enrollment period (October 15 to December 7) or if you may have access to for a special enrollment period due to a life event like moving or losing coverage. If you need Diamox Sequels urgently and your current plan does not cover it, contact your plan to ask about an exception or talk to your doctor about alternative medications your plan does cover.

Does my copay for Diamox Sequels count toward my out-of-pocket maximum?

Yes, copays and coinsurance for Diamox Sequels count toward your Part D out-of-pocket maximum. Once you reach that maximum in a calendar year, your plan pays 100 percent of the cost of covered drugs for the rest of that year.

Can I get a 90-day supply of Diamox Sequels to save money?

Many Part D plans offer lower copays for 90-day supplies filled through mail order or at certain pharmacies. Check your plan's formulary or call your plan to ask whether a 90-day supply is available and what the copay would be. This can reduce your out-of-pocket costs if you take Diamox Sequels long-term.