Medicare covers most blood work ordered by your doctor, but you pay a share of the cost depending on which part of Medicare you have and where the test happens.
If your doctor orders blood work in an office visit, at a hospital outpatient lab, or at an independent lab, Medicare Part B pays 80 percent of the approved amount after you meet your deductible. You pay the remaining 20 percent. If you have a Medigap or Medicare Advantage plan, your out-of-pocket cost may be lower — it depends on your specific plan.
Blood work done during an inpatient hospital stay is covered under Medicare Part A (hospital insurance) as part of your hospital bill. You pay a copay for the hospital stay itself, not separately for the blood tests.
The key to keeping costs down is making sure your doctor orders the blood work as medically necessary. Medicare will not cover routine screening blood work that is not tied to a diagnosis or symptom your doctor is investigating.
Key Takeaways
- Medicare Part B covers blood work ordered by your doctor at a lab or office, and you pay 20 percent of the approved cost after your deductible.
- Blood work done during a hospital stay is covered under Part A as part of your hospital bill, with no separate charge for the tests.
- Medicare covers blood work only when your doctor orders it for a medical reason — not for routine screening without symptoms or a diagnosis.
- If you have a Medigap plan, it typically covers your 20 percent share; if you have Medicare Advantage, check your plan's copay structure.
- Ask your doctor or the lab whether they accept Medicare assignment, which means they bill Medicare directly and you pay only your share.
How Medicare Part B Covers Blood Work
When your doctor orders blood work and sends you to a lab, Medicare Part B covers the test if it is medically necessary. You pay your annual Part B deductible first (the amount changes each year). After you meet the deductible, Medicare pays 80 percent of what it considers the approved amount, and you pay 20 percent.
The approved amount is not always what the lab charges. If the lab is in-network with Medicare (which most are), they have agreed to accept Medicare's approved amount as payment in full for their portion. You pay 20 percent of that approved amount. If the lab is out-of-network, you may owe more.
The type of blood work does not change how Medicare covers it — whether it is a basic metabolic panel, lipid panel, thyroid test, or blood count, the coverage works the same way. What matters is that your doctor ordered it for a medical reason.
Blood Work During a Hospital Stay
If you are admitted to the hospital as an inpatient and blood work is done as part of your care, it is covered under Medicare Part A. You do not pay separately for the blood tests. Instead, you pay a single copay for the hospital stay itself, which varies depending on how many days you stay.
This is different from outpatient lab work. If you go to a hospital's outpatient lab or lab department without being admitted, that blood work is covered under Part B, and you pay the 20 percent coinsurance after your deductible.
What Blood Work Medicare Does Not Cover
Medicare does not cover blood work ordered for screening purposes when you have no symptoms or diagnosis. For example, if you ask your doctor for a general health checkup blood panel and you have no medical reason for it, Medicare will not pay for it. Your doctor must have a medical reason — such as monitoring a chronic condition, investigating symptoms, or following up on an abnormal result — to order blood work that Medicare will cover.
Some specialized or experimental blood tests may also not be covered. If your doctor wants to order an uncommon test, ask whether Medicare covers it before you have the test done. The lab or your doctor's office can check this for you.
How to Lower Your Out-of-Pocket Costs
If you have a Medigap (supplemental insurance) plan, it typically covers the 20 percent coinsurance you would otherwise pay for blood work. This means you pay little to nothing out of pocket. Check your Medigap plan documents to confirm what it covers.
If you have a Medicare Advantage plan, blood work is covered, but your copay depends on your specific plan. Some plans charge a copay per visit or per test; others charge coinsurance. Review your plan's summary of benefits or call the plan to find out what you will owe before you have the blood work done.
Ask the lab or your doctor's office whether they accept Medicare assignment. If they do, they bill Medicare directly and you pay only your share. If they do not accept assignment, you may have to pay the full bill upfront and then request reimbursement from Medicare.
When to Ask Questions Before Blood Work
Before your blood work is done, ask your doctor or the lab staff: "Does Medicare cover this test?" and "What will I owe?" If the lab is not sure, they can contact Medicare to verify coverage. This takes a few minutes and can prevent a surprise bill.
If your doctor orders multiple tests, ask which ones are medically necessary and which are optional. This helps you understand what Medicare will cover and what you might have to pay for out of pocket.
If you receive a bill after blood work that seems wrong — such as a bill for the full amount instead of just your 20 percent share — contact the lab and ask them to resubmit the claim to Medicare or to explain the charge.
Medicare Coverage for Specific Common Blood Tests
Routine blood work your doctor orders to monitor a chronic condition — such as diabetes, heart disease, or kidney disease — is covered by Medicare. This includes tests like hemoglobin A1C (for diabetes), lipid panels (for heart disease), and metabolic panels (for kidney function). Your doctor must document that the test is medically necessary.
Annual wellness visits include a covered blood draw as part of the visit, but only certain basic tests are included. If your doctor orders additional tests beyond what is included in the wellness visit, those are covered separately under Part B with your 20 percent coinsurance.
Blood work ordered to diagnose a new symptom or condition is covered. For example, if you have fatigue and your doctor orders blood work to check for anemia or thyroid problems, Medicare covers it.
Frequently Asked Questions
Do I have to pay my Part B deductible every time I have blood work?
No. You pay your deductible once per calendar year. After you meet it, you pay only your 20 percent coinsurance for the rest of the year. If you have already met your deductible for the year, you owe only 20 percent of the approved amount for blood work.
What if the lab charges more than Medicare's approved amount?
If the lab accepts Medicare assignment, they cannot charge you more than your 20 percent share of the approved amount. If they do not accept assignment, you may owe the difference. Always ask the lab whether they accept Medicare assignment before the test.
Does Medicare cover blood work for life insurance or employment?
No. Blood work ordered for non-medical reasons — such as for a life insurance process or employment screening — is not covered by Medicare. You pay the full cost yourself.
Will my Medicare Advantage plan cover blood work the same way as Original Medicare?
Medicare Advantage plans must cover the same blood work that Original Medicare covers, but your out-of-pocket cost may be different. Some plans charge a copay per visit, others charge coinsurance. Check your plan's summary of benefits or call the plan to find out what you will owe.
Can I get blood work at any lab, or does it have to be a specific one?
You can use any lab that accepts Medicare. Most labs do. If you use a lab that does not accept Medicare, you may have to pay upfront and request reimbursement. Ask your doctor's office which labs they work with, or ask the lab whether they accept Medicare before you go.