Medicare covers allergy testing, but only certain types, and only when your doctor orders it to diagnose a condition

Medicare Part B covers allergy skin testing when a doctor believes you have an allergic condition that needs diagnosis. The test itself is covered at 80 percent after you meet your Part B deductible — you pay the remaining 20 percent. However, Medicare does not cover allergy testing done for screening purposes (testing when you have no symptoms), testing to monitor a known allergy over time, or intradermal testing in some cases. The rules depend on why the test is being done and which type of test your doctor orders.

If you have a Medigap or Medicare Advantage plan, your out-of-pocket costs may be lower. Medigap plans often cover the 20 percent coinsurance. Medicare Advantage plans vary — some cover allergy testing at a copay instead of coinsurance, while others follow the same 80/20 split as Original Medicare. Check your plan documents or call the plan to know your exact cost before the test.

Key Takeaways

  • Medicare Part B covers allergy skin testing when a doctor orders it to diagnose a suspected allergic condition, but you pay 20 percent coinsurance after your deductible.
  • Allergy testing done for screening (no symptoms) or to monitor a known allergy is not covered by Medicare.
  • Intradermal testing may not be covered in all situations, so ask your doctor which type of test they plan to order.
  • Medigap plans typically cover the 20 percent coinsurance, while Medicare Advantage plans have varying copays — contact your plan to confirm your cost.
  • Your doctor's office should verify coverage before the test to avoid unexpected bills.

What types of allergy testing Medicare covers

Medicare covers percutaneous (skin prick) allergy testing when ordered by your doctor to diagnose an allergic condition. In this test, the doctor places a small amount of allergen extract on your skin and makes a tiny scratch or prick. If you are allergic, a small raised bump appears within 15 minutes. This is the most common type and the one Medicare is most likely to cover.

Intradermal testing — where the allergen is injected just under the skin — may be covered, but Medicare's rules are stricter. This test is typically used when skin prick testing is inconclusive or when testing for certain allergens. Your doctor needs to document why skin prick testing alone was not sufficient. If your doctor orders intradermal testing without that documentation, Medicare may deny the claim.

Patch testing (used mainly for contact dermatitis) and blood tests for allergies (RAST or ImmunoCAP tests) are generally not covered by Medicare, even when ordered by a doctor. If your doctor recommends one of these instead of skin testing, ask whether it is medically necessary and whether Medicare will cover it before you proceed.

When Medicare will not cover allergy testing

Medicare does not cover allergy testing done for screening purposes — that is, testing when you have no symptoms or signs of an allergic condition. If you want to know whether you are allergic to something but have never had a reaction, Medicare considers this preventive screening and does not pay for it.

Medicare also does not cover testing ordered to monitor a known allergy over time. If you already know you are allergic to peanuts, for example, Medicare will not pay for repeat testing to see if the allergy has changed. Testing is covered only when the diagnosis is uncertain and the test will guide treatment decisions.

Testing done in an allergist's office as part of an immunotherapy (allergy shot) program may have different coverage rules. Some of the testing tied to starting or adjusting allergy shots is covered; other parts may not be. Ask your allergist's office to check with Medicare before your appointment.

How much you will pay

Under Original Medicare Part B, you pay 20 percent of the Medicare-approved amount for allergy testing after you have met your annual Part B deductible (which is $240 in 2024, though this amount changes yearly). The actual cost depends on what Medicare approves for the test in your area — this varies by region and can range from roughly $50 to $150 for a basic skin prick test, though more extensive testing costs more.

If you have not yet met your deductible for the year, you pay the full cost of the test until the deductible is reached, then Medicare pays 80 percent of the approved amount for the remainder of the year. If you have already met your deductible, you pay only the 20 percent coinsurance at the time of service.

Some doctors' offices bill Medicare directly and collect your coinsurance at the time of the visit. Others may bill you first and ask you to submit the claim to Medicare yourself. Ask your doctor's office about their billing process before your appointment so you know whether to bring a payment method.

How Medigap and Medicare Advantage plans affect your cost

If you have a Medigap plan, most plans (Plans C, D, F, G, M, and N) cover the 20 percent coinsurance for allergy testing. This means you would pay only your Part B deductible and then nothing more for the test itself. Plans A and B do not cover this coinsurance, so you would still owe the 20 percent. Check your Medigap plan documents or call your plan to confirm.

Medicare Advantage plans vary widely. Some charge a copay for allergy testing (often $20 to $50), while others explore coinsurance like Original Medicare. A few plans may cover allergy testing at no cost. You need to check your specific plan's coverage details — call the plan's customer service number on your insurance card or review your plan documents. Also confirm that the allergist you want to see is in your plan's network, since out-of-network testing may cost significantly more.

Steps to take before your allergy test

Ask your primary care doctor or allergist to verify coverage with Medicare before scheduling the test. The doctor's office can submit a coverage question to Medicare (called a "coverage information request") and receive an answer within a few days. This protects you from unexpected bills if Medicare denies the claim.

Provide your Medicare card and any supplemental insurance information to the doctor's office. They will need your Medicare number and the group number from any Medigap or Medicare Advantage plan you have. Ask the office to tell you the estimated cost you will owe based on your deductible status and plan coverage.

If you are taking antihistamines (allergy medications), ask your doctor whether you need to stop them before the test. Most antihistamines interfere with skin testing results, so you may need to stop them 3 to 7 days before the appointment. Your doctor will give you specific instructions.

What to ask your doctor

Before your allergy test, ask these questions to understand what Medicare will cover:

  • Why do you believe I have an allergic condition, and how will this test help diagnose it?
  • Will you be ordering skin prick testing, intradermal testing, or another type of test?
  • Can your office verify with Medicare that this test is covered before I come in?
  • What is the estimated cost I will owe, and when will I need to pay it?
  • Do I need to stop taking any allergy medications before the test?
  • If the test results are inconclusive, would you order a different type of test, and would Medicare cover that?

Frequently Asked Questions

Does Medicare cover allergy testing at urgent care or retail clinics?

Medicare covers allergy testing at any facility where a doctor orders it, including urgent care centers and retail clinics, as long as the test meets Medicare's coverage rules. However, these settings typically do not perform allergy testing — most allergy testing is done in allergists' offices or hospital outpatient departments. Call ahead to confirm the facility offers the type of test your doctor ordered.

What happens if Medicare denies my allergy test claim?

If Medicare denies the claim, you have the right to appeal. The doctor's office or the testing facility should send you a notice explaining why it was denied. You can ask the office to appeal on your behalf, or you can submit an appeal yourself within 180 days of the denial notice. Many denials are overturned on appeal if your doctor provides additional documentation of why the test was medically necessary.

Will Medicare cover allergy testing if I am allergic to a medication?

Medicare may cover testing for drug allergies, but the rules are different from environmental allergy testing. Drug allergy testing is often done through graded challenge tests or patch tests rather than skin prick tests. Ask your doctor whether the test is covered and whether it will be done in a hospital setting, since some drug allergy testing must be done where emergency equipment is available.

Can I get allergy testing covered if I have a Medicare Advantage plan with zero copay?

Some Medicare Advantage plans advertise zero copay for many services, but allergy testing may still have a copay or coinsurance depending on how the plan classifies it. Check your plan documents or call the plan to confirm. Plans change their coverage each year, so even if allergy testing was free last year, it may have a cost this year.

Does Medicare cover follow-up allergy testing after I start allergy shots?

Medicare covers some testing related to allergy immunotherapy (allergy shots), such as testing to determine which allergens to include in your shot formula. However, repeat testing to monitor whether your allergies have improved is generally not covered. Ask your allergist which tests are part of your treatment plan and which ones Medicare will cover.