Medicare Part B covers Prolia, but only under specific conditions

Yes, Medicare Part B covers Prolia (denosumab), a medication that treats bone loss in people with osteoporosis. However, coverage is not automatic — your doctor must document that you meet certain medical criteria, and you will pay your usual Part B cost-sharing (20% of the approved amount after you meet your deductible).

Prolia is a monoclonal antibody injection given twice a year to slow bone loss and reduce fracture risk. Medicare considers it a Part B drug because it is administered in a doctor's office or hospital outpatient setting, not a pharmacy. This means it falls under the physician fee schedule rather than the Part D prescription drug benefit.

Key Takeaways

  • Medicare Part B covers Prolia injections when prescribed by your doctor in an office or outpatient hospital setting.
  • Your doctor must document that you have osteoporosis or a condition that causes bone loss, and that Prolia is medically necessary for you.
  • You pay 20% coinsurance of the Medicare-approved amount after meeting your Part B deductible, unless you have supplemental coverage.
  • Some Medicare Advantage plans cover Prolia differently — check your plan documents or call your plan to confirm your out-of-pocket cost.
  • If your doctor's office bills Prolia as a pharmacy drug by mistake, ask them to rebill it as a Part B injection to avoid higher out-of-pocket costs.

How Medicare decides whether to cover Prolia for you

Medicare Part B covers Prolia when your doctor determines it is medically necessary. This typically means you have been diagnosed with osteoporosis (usually confirmed by a bone density test called a DEXA scan) or another condition that causes bone loss, such as multiple myeloma or certain cancers treated with hormone therapy.

Your doctor does not need to request prior approval from Medicare before prescribing Prolia, but they do need to document in your medical record why you need it. If Medicare later questions the claim, your doctor's notes showing the diagnosis and reasoning will support coverage. If your claim is denied, you have the right to appeal.

What you will pay out of pocket

Under Original Medicare, you pay 20% coinsurance of the Medicare-approved amount for Prolia after you meet your Part B deductible (which is $240 in 2024, though this amount changes yearly). The actual amount you pay depends on what Medicare approves in your area and whether your doctor's office accepts Medicare assignment.

If you have a Medigap (supplemental insurance) policy, it may cover some or all of your 20% coinsurance, depending on which plan you have. If you have a Medicare Advantage plan, your cost-sharing may be different — some plans charge a copay instead of coinsurance, and some may require prior approval. Check your plan documents or call your plan's customer service line to find out your specific cost.

The difference between Part B coverage and Part D coverage

Prolia given as an injection in a medical office is a Part B drug. If somehow your doctor prescribed Prolia as a self-injection that you pick up at a pharmacy, it would be covered under Part D (prescription drug coverage) instead, and you would likely pay more out of pocket. Part D plans have different deductibles, copays, and formularies than Part B.

Always confirm with your doctor's office that Prolia will be administered there as a Part B injection. If there is any confusion, ask the office to bill it as a Part B service. If you receive a bill suggesting it should have been covered under Part D, contact the office and ask them to correct the billing.

What to do if your claim is denied

If Medicare denies coverage for Prolia, you will receive a notice called a Medicare Summary Notice (MSN) or Explanation of Benefits (EOB) explaining the reason. Common reasons for denial include lack of documentation of osteoporosis diagnosis, or a information that the drug was not medically necessary.

You have the right to appeal. Start by asking your doctor's office to review the denial and provide any missing documentation to Medicare. If the denial stands, you can file a formal appeal by following the instructions on your notice. Many people find it helpful to have their doctor's office handle the appeal, since they have access to your medical records.

Medicare Advantage plans and Prolia

If you are enrolled in a Medicare Advantage plan (Part C), your coverage of Prolia may differ from Original Medicare. Some plans cover it with a copay, others with coinsurance, and some may require prior approval from the plan before your doctor administers it. A few plans may not cover Prolia at all, or may cover it only under certain conditions.

Contact your Medicare Advantage plan directly to ask about Prolia coverage before your first injection. Ask specifically whether prior approval is needed, what your out-of-pocket cost will be, and whether the drug is on the plan's formulary. If your plan does not cover Prolia or charges a very high cost, you may be able to switch to Original Medicare or a different Medicare Advantage plan during the annual open enrollment period.

Frequently Asked Questions

Do I need prior approval from Medicare before getting Prolia?

No, Medicare does not require prior approval for Prolia. Your doctor can prescribe it and have it administered in the office. However, Medicare may review the claim afterward to confirm you have a diagnosis that supports its use. If you have a Medicare Advantage plan, that plan may require prior approval — contact your plan to check.

Will I pay the same amount for Prolia every time I get an injection?

Your coinsurance (20% of the approved amount) should be similar each time, but the exact amount depends on the Medicare-approved price in your area and whether your doctor's office accepts Medicare assignment. If you have met your Part B deductible for the year, you will only pay the 20% coinsurance. If you have not met it, you will pay the deductible first, then 20% of the remaining cost.

Can I get Prolia covered under Part D instead of Part B?

Prolia is designed to be given as an office injection covered under Part B. If a pharmacy tries to fill it as a self-injection, it would fall under Part D, but this is unusual and typically costs more. Ask your doctor to administer it in the office as a Part B service to keep your costs lower.

What if my doctor's office says Prolia is not covered by Medicare?

This is usually incorrect. Prolia is a covered Part B drug for people with osteoporosis or bone loss conditions. Ask the office to contact Medicare or to resubmit the claim. If they continue to say it is not covered, you can contact Medicare directly at 1-800-MEDICARE to confirm coverage, or ask your doctor to refer you to another office that administers Prolia.