Does job-based or Marketplace insurance cover thyroid scan?

Usually covered when your doctor orders it for a thyroid problem: most thyroid scans are a neck ultrasound or a nuclear uptake scan, not a CT or MRI. A thyroid ultrasound is the usual first test for a lump or nodule; it takes about 20 minutes and rarely needs prior authorization. A nuclear thyroid scan (a small dose of radioactive iodine, then pictures and an uptake reading, often over two days) checks an overactive thyroid or a nodule, and plans often require prior authorization for it. A CT or MRI of the neck is used only in special cases, such as a large goiter pressing on the windpipe. Ask the office which test was ordered: the approval and the price depend on it. Cost: Your deductible, then your imaging copay or coinsurance; an ultrasound usually costs far less than a nuclear scan.

Does Original Medicare cover thyroid scan?

Yes, Part B covers a thyroid ultrasound or nuclear thyroid scan your doctor orders to diagnose a thyroid problem. Most thyroid scans are a neck ultrasound or a nuclear uptake scan with a small dose of radioactive iodine, not a CT or MRI. Part B pays for either when it’s ordered for symptoms or a finding, such as a lump, an overactive thyroid, or abnormal blood tests. Cost: Generally 20% of the Medicare-approved amount after the Part B deductible.

Does Medicare Advantage cover thyroid scan?

Yes, Medicare Advantage plans must cover thyroid scan, but your plan sets the copay. Most thyroid scans are a neck ultrasound or a nuclear uptake scan with a small dose of radioactive iodine, not a CT or MRI. Part B pays for either when it’s ordered for symptoms or a finding, such as a lump, an overactive thyroid, or abnormal blood tests. Medicare Advantage plans must cover this too, but set their own copays and often require in-network providers and prior authorization. Cost: Your plan’s copay or coinsurance: check the Evidence of Coverage.

Does Medicaid cover thyroid scan?

Yes, Medicaid covers a thyroid ultrasound or nuclear scan your doctor orders. Most thyroid scans are an ultrasound or a nuclear uptake scan, not a CT or MRI. A nuclear scan may need prior authorization from your plan.

Is thyroid scan covered by insurance?

Imaging of the thyroid: usually a neck ultrasound or a nuclear uptake scan, rarely a CT or MRI. Here’s how each kind of plan usually handles it.

Ask a specific question Plan a visit: cost and doctors Check it against my plan

Employer or MarketplaceCovered with conditions
Usually covered when your doctor orders it for a thyroid problem: most thyroid scans are a neck ultrasound or a nuclear uptake scan, not a CT or MRI.
More details
A thyroid ultrasound is the usual first test for a lump or nodule; it takes about 20 minutes and rarely needs . A nuclear thyroid scan (a small dose of radioactive iodine, then pictures and an uptake reading, often over two days) checks an overactive thyroid or a nodule, and plans often require prior authorization for it. A CT or MRI of the neck is used only in special cases, such as a large goiter pressing on the windpipe. Ask the office which test was ordered: the approval and the price depend on it.
Cost: Your deductible, then your imaging copay or coinsurance; an ultrasound usually costs far less than a nuclear scan.
Original MedicareCovered with conditions
Yes, Part B covers a thyroid ultrasound or nuclear thyroid scan your doctor orders to diagnose a thyroid problem.
More details
Most thyroid scans are a neck ultrasound or a nuclear uptake scan with a small dose of radioactive iodine, not a CT or MRI. pays for either when it’s ordered for symptoms or a finding, such as a lump, an overactive thyroid, or abnormal blood tests.
Cost: Generally 20% of the Medicare-approved amount after the Part B deductible.
Medicare AdvantageCovered with conditions
Yes, Medicare Advantage plans must cover thyroid scan, but your plan sets the copay.
More details
Most thyroid scans are a neck ultrasound or a nuclear uptake scan with a small dose of radioactive iodine, not a CT or MRI. pays for either when it’s ordered for symptoms or a finding, such as a lump, an overactive thyroid, or abnormal blood tests. plans must cover this too, but set their own copays and often require in-network providers and prior authorization.
Cost: Your plan’s copay or coinsurance: check the Evidence of Coverage.
MedicaidUsually covered
Yes, Medicaid covers a thyroid ultrasound or nuclear scan your doctor orders.
More details
Most thyroid scans are an ultrasound or a nuclear uptake scan, not a CT or MRI. A nuclear scan may need from your plan.

Plan type	How it’s usually covered
Employer or MarketplaceCovered with conditions	Usually covered when your doctor orders it for a thyroid problem: most thyroid scans are a neck ultrasound or a nuclear uptake scan, not a CT or MRI. A thyroid ultrasound is the usual first test for a lump or nodule; it takes about 20 minutes and rarely needs . A nuclear thyroid scan (a small dose of radioactive iodine, then pictures and an uptake reading, often over two days) checks an overactive thyroid or a nodule, and plans often require prior authorization for it. A CT or MRI of the neck is used only in special cases, such as a large goiter pressing on the windpipe. Ask the office which test was ordered: the approval and the price depend on it. Cost: Your deductible, then your imaging copay or coinsurance; an ultrasound usually costs far less than a nuclear scan.
Original MedicareCovered with conditions	Yes, Part B covers a thyroid ultrasound or nuclear thyroid scan your doctor orders to diagnose a thyroid problem. Most thyroid scans are a neck ultrasound or a nuclear uptake scan with a small dose of radioactive iodine, not a CT or MRI. pays for either when it’s ordered for symptoms or a finding, such as a lump, an overactive thyroid, or abnormal blood tests. Cost: Generally 20% of the Medicare-approved amount after the Part B deductible.
Medicare AdvantageCovered with conditions	Yes, Medicare Advantage plans must cover thyroid scan, but your plan sets the copay. Most thyroid scans are a neck ultrasound or a nuclear uptake scan with a small dose of radioactive iodine, not a CT or MRI. pays for either when it’s ordered for symptoms or a finding, such as a lump, an overactive thyroid, or abnormal blood tests. plans must cover this too, but set their own copays and often require in-network providers and prior authorization. Cost: Your plan’s copay or coinsurance: check the Evidence of Coverage.
MedicaidUsually covered	Yes, Medicaid covers a thyroid ultrasound or nuclear scan your doctor orders. Most thyroid scans are an ultrasound or a nuclear uptake scan, not a CT or MRI. A nuclear scan may need from your plan.

What usually has to be true

Ordered for a thyroid problem: a lump or nodule, an over- or underactive thyroid, or abnormal blood tests.
A nuclear uptake scan often needs prior authorization; an ultrasound rarely does.

Good to know

A thyroid blood test (TSH) is a lab test, not a scan.
A nuclear scan isn’t done during pregnancy or breastfeeding; tell the office if either applies.
If the ultrasound finds a nodule, a needle biopsy is a separate service with its own cost sharing.

Ultrasound · Sonogram imaging, including pregnancy ultrasounds.
Blood tests & lab work · Blood work, urine tests, and other lab services.
Biopsy · Taking a tissue sample to check for cancer or other disease.

Sources

Typical rules for 2026 plans, checked against these sources on October 20, 2026. Your plan’s own documents decide.

1
What Marketplace plans cover
HealthCare.gov
Marketplace plans cover outpatient care, hospitalization, mental health care, prescription drugs, rehabilitation, laboratory services, preventive services, and other essential benefit categories.
2
Prior authorization
HealthCare.gov
Prior authorization is a decision by the plan that a service, treatment, drug, or equipment is medically necessary; it is not a promise to pay.
3
Diagnostic non-laboratory tests
Medicare.gov
Part B covers diagnostic tests such as CT scans, MRIs, EKGs, X-rays, and PET scans when a doctor orders them to treat a medical problem; you generally pay 20% after the deductible.
4
Compare Original Medicare and Medicare Advantage
Medicare.gov
Medicare Advantage plans cover everything Original Medicare covers (except hospice, which Original Medicare continues to pay), usually use provider networks, often require referrals or prior authorization, and may offer extra benefits such as dental, vision, and hearing.
5
Mandatory and optional Medicaid benefits
Medicaid.gov
States must cover mandatory benefits such as inpatient and outpatient hospital care, physician services, laboratory and X-ray services, home health, and nursing facility care; many other benefits, including adult dental, vision, and prescription drugs coverage details, are state options.

General information about how coverage usually works, not a decision about your plan. Your plan documents and insurer have the final word.

Prior authorization: Sometimes needed; A thyroid ultrasound rarely needs prior authorization; a nuclear uptake scan often does, like other nuclear imaging.
Typical total price: $150 to $1,200; per service, rough national range before insurance
Where to look in your SBC: Diagnostic test (x-ray, blood work); Imaging (CT/PET scans, MRIs)
Pay with HSA or FSA: Eligible; A qualified medical expense: you can pay with an HSA, FSA, or HRA.

What you’d likely pay

For thyroid scan, typically $150 to $1,200

Example: you might pay

$680

You $680Plan $0

$680 toward your deductible.

Based on a $680 bill, $1,500 left on your deductible and 20% coinsurance.

These are typical numbers, not your plan’s. Many plans charge a flat copay for visits instead. Use the numbers on your card or plan summary for a real estimate.

Was thyroid scan denied?Build an appeal with the right deadlines.

Is thyroid scan covered by insurance?

What usually has to be true

Good to know

Related

Sources