What to Know About Medicare Coverage for PET Scans

Does Medicare Cover PET Scans?

Medicare Part B generally covers diagnostic non-laboratory tests, including PET scans, when a doctor or other qualified provider orders the test to diagnose or treat a medical problem. The scan must be considered reasonable and necessary for the patient’s individual circumstances.

A scan ordered to evaluate a suspicious lung nodule, stage a diagnosed cancer, assess heart muscle, or guide a treatment decision may qualify. A broad whole-body scan requested simply to “check everything” usually will not. Medicare does not generally cover PET imaging as a routine screening service without a medically supported indication.

Most PET scans are performed as outpatient services and billed under Part B. When imaging is provided during a covered inpatient hospital stay, it may instead be included among the hospital services covered under Part A.

How Medicare Determines PET Scan Coverage

Medicare coverage is shaped by national coverage determinations, local policies issued by Medicare Administrative Contractors, and general medical-necessity standards. Some PET uses have detailed nationwide rules. Uses not addressed by a controlling national policy may be evaluated by the Medicare contractor serving the patient’s area.

The diagnosis and medical indication

The diagnosis or suspected diagnosis must support the need for PET imaging. Medical records should explain the patient’s symptoms, prior test results, clinical uncertainty, and how the PET scan is expected to influence care.

The purpose of the test

Coverage may depend on whether the scan will guide an initial treatment strategy, evaluate possible recurrence, measure treatment response, assess heart function, or clarify a difficult neurological diagnosis. A scan may be covered for one clinical purpose but not another.

The tracer and imaging protocol

PET is a family of imaging studies rather than one universal test. FDG PET uses a glucose-like tracer and is frequently used in cancer care. Cardiac PET may use different tracers to examine blood flow or viable heart tissue. PSMA PET targets a protein associated with prostate cancer cells, while amyloid PET detects beta-amyloid plaques in the brain.

The documentation

The medical record should contain the test order, diagnosis, relevant pathology or laboratory findings, prior imaging, and a clear explanation of how the result will affect treatment. Missing documentation can transform a sensible medical test into a billing mystery with an unusually expensive ending.

Common Conditions for Which Medicare May Cover PET Scans

Cancer care

Cancer is one of the most common reasons for PET or PET/CT imaging. Medicare may cover an appropriate scan to locate a suspected tumor, determine whether cancer has spread, guide a biopsy, plan radiation therapy, evaluate recurrence, or help determine whether treatment is working.

Coverage is not identical for every cancer, tracer, or phase of treatment. Some uses are governed by national rules, while additional scans and newer tracer-based studies may be evaluated under local Medicare policies.

Heart disease

Cardiac PET may be covered to examine blood flow through the heart or determine whether damaged heart muscle remains viable. The results may help a doctor decide whether a procedure such as revascularization could be beneficial.

Dementia and neurological disorders

Medicare has specific national requirements for FDG PET in certain difficult cases involving the differential diagnosis of Alzheimer’s disease and frontotemporal dementia. Requirements may include documented cognitive decline, a comprehensive clinical evaluation, structural imaging, and continued uncertainty after other causes have been considered.

Beta-amyloid PET follows a separate coverage pathway. Effective October 13, 2023, Medicare removed the former national coverage restriction and the once-per-lifetime requirement. Coverage is now generally determined by the applicable Medicare Administrative Contractor according to medical necessity and local policy.

PET imaging may also be covered for narrowly defined uses such as the presurgical evaluation of certain patients with refractory seizures. Other uses may receive local consideration when they are not specifically covered or excluded by a national policy.

How Much Does a PET Scan Cost With Original Medicare?

For a covered outpatient PET scan under Original Medicare, the patient generally pays the Part B deductible and then 20% of the Medicare-approved amount. The annual Medicare Part B deductible is $283 in 2026.

The actual PET scan cost with Medicare can vary according to:

• whether the annual Part B deductible has already been met;
• the PET tracer and imaging protocol used;
• whether the scan is performed at an independent center or hospital outpatient department;
• whether the facility and interpreting physician accept Medicare assignment;
• whether a separate hospital outpatient copayment applies;
• whether the patient has Medigap, Medicaid, employer insurance, or another secondary payer.

A hospital outpatient department may charge a copayment that results in higher patient responsibility than an independent imaging facility. Patients can ask both locations for estimates, provided each site is accredited and capable of performing the exact study ordered.

Accreditation matters

Advanced imaging performed outside a hospital must come from a properly accredited provider for Medicare payment. Before scheduling, ask whether the facility is Medicare-accredited for PET imaging. When Medicare refuses payment solely because the provider lacks required accreditation, the provider generally cannot pass the test cost to the patient.

How Medigap may reduce the bill

A Medicare Supplement Insurance policy may cover some or all of the patient’s Part B coinsurance, depending on the Medigap plan. Medigap does not turn a noncovered PET scan into a covered service; it helps pay the patient’s share after Original Medicare approves the claim.

Medicare Advantage Coverage for PET Scans

Medicare Advantage plans must cover medically necessary services that Original Medicare covers. However, these plans may apply their own provider networks, referrals, copayments, coinsurance, and prior authorization procedures.

Before the appointment, confirm:

• the ordering doctor and imaging facility are in network;
• the plan covers the exact PET or PET/CT study;
• required prior authorization has been approved;
• the authorization applies to the selected facility;
• the estimate includes the tracer, facility charge, and image interpretation.

“My doctor ordered the scan” and “my plan authorized the scan” are related statements, but they are not twins. Verifying both can prevent delays and unexpected bills.

A Medicare PET Scan Checklist

1. Ask why the test is needed. Identify the treatment or diagnostic decision that depends on the result.
2. Get the exact test name. Confirm whether the order is for FDG PET, cardiac PET, PSMA PET, amyloid PET, or another protocol.
3. Check the records. Make sure prior imaging, pathology, laboratory findings, and medical-necessity notes are available.
4. Confirm authorization. Medicare Advantage members should obtain an authorization number when required.
5. Verify the facility. Ask about accreditation, Medicare participation, network status, and assignment.
6. Request an estimate. Ask about all facility, tracer, and professional charges.
7. Review noncoverage notices. Under Original Medicare, carefully read any Advance Beneficiary Notice before signing it.

What to Do if Medicare Denies the Scan

A denial does not always mean the PET scan is permanently excluded. The problem may be an incorrect diagnosis code, missing records, absent authorization, or failure to show how the result would influence treatment.

With Original Medicare, review the Medicare Summary Notice and follow its appeal instructions. Ask the provider for supporting records and a written medical-necessity explanation. Original Medicare has five appeal levels, beginning with redetermination.

Medicare Advantage members should request the plan’s written denial and appeal instructions. An expedited appeal may be available when waiting could seriously harm the patient’s health. Keep copies of orders, authorization requests, denial notices, clinical records, and call reference numbers.

What to Expect During a PET Scan

For many FDG PET/CT scans, patients are told not to eat for several hours and to drink only water. Blood sugar may be checked because elevated glucose can interfere with tracer distribution. People with diabetes need individualized instructions and should not change insulin, meals, or medications without guidance.

After the radiotracer is administered, the patient usually rests quietly while it circulates. The patient then lies on a table that moves through the scanner. The imaging itself is painless, although remaining still can be uncomfortable. PET is frequently combined with CT so doctors can compare metabolic activity with detailed anatomy.

Tell the imaging team about pregnancy, breastfeeding, diabetes, allergies, kidney problems, claustrophobia, and current medications. Many patients can resume ordinary activities afterward and may be advised to drink water to help clear the tracer.

Experiences Related to Medicare Coverage for PET Scans

The following are composite educational scenarios based on common scheduling and billing experiences. They do not describe one identifiable patient.

Experience 1: The location changed the expected cost

A patient receiving treatment for lymphoma was referred for a PET/CT to evaluate treatment response. The oncology office confirmed that the test met Medicare’s medical-necessity requirements, and the patient scheduled it at the hospital where treatment was provided. Keeping everything under one roof seemed convenient.

Before the appointment, a family member requested an estimate. The hospital quoted a larger outpatient copayment than expected. The patient then contacted an accredited independent imaging center that accepted Medicare assignment. After confirming that the center could perform the correct protocol and send the images to the oncologist, the patient changed locations and reduced the estimated out-of-pocket cost.

The lesson was not that independent centers are always less expensive. It was that the site of service can affect the final bill, even when Medicare covers the same underlying test.

Experience 2: Prior authorization was the hidden speed bump

Another patient with a Medicare Advantage plan needed a PSMA PET scan after a rising prostate-specific antigen level. The urologist ordered the study, and the imaging center offered a prompt appointment. During scheduling, however, the center discovered that the plan required prior authorization.

The insurer requested pathology records, recent laboratory results, previous imaging, and a clinical note explaining how the PET result would affect treatment. The appointment was briefly postponed while those records were submitted.

The delay was annoying, but it prevented a worse outcome: completing the scan without authorization and then disputing the entire bill. The patient began asking before every advanced imaging appointment, “Has my plan approved this exact test at this exact facility?” It is not poetic, but it is effective.

Experience 3: Better documentation corrected a denial

A patient with a complicated cancer history received an initial denial for a follow-up PET scan. The notice indicated that Medicare had not received enough information to establish medical necessity.

The oncology office reviewed the claim and discovered that the submitted record did not clearly include earlier scan findings or explain why conventional imaging was inconclusive. The provider supplied the missing reports and submitted a more detailed explanation showing which treatment decision depended on the PET result.

That experience demonstrated the difference between stating that a doctor wants a scan and documenting why the scan is necessary. Specific medical reasoning gives Medicare or a health plan something concrete to review.

Experience 4: Coverage was confirmed, but preparation caused trouble

One patient spent several days confirming Medicare coverage and then drank a sweetened beverage on the morning of an FDG PET scan. The imaging center explained that the sugar could interfere with tracer distribution and make the images less reliable. The appointment had to be rescheduled.

Afterward, the patient maintained two checklists. The insurance checklist included authorization, network status, accreditation, assignment, and estimated cost. The preparation checklist included fasting, water, medication instructions, arrival time, and diabetes guidance.

Both lists mattered. A fully authorized scan that cannot be performed correctly still results in a wasted trip. The smoothest experience usually comes from coordinating four parties: the ordering provider, the imaging facility, Medicare or the Medicare Advantage plan, and the patient.

Final Takeaway

Medicare often covers PET scans when they are ordered to diagnose or treat a medical problem and satisfy national or local medical-necessity requirements. Under Original Medicare, a covered outpatient scan is generally subject to the Part B deductible and 20% coinsurance, with possible additional hospital outpatient costs. Medicare Advantage members may also face network and prior authorization requirements.

Before the appointment, verify the exact scan, clinical indication, facility, authorization, and estimated patient responsibility. PET technology may examine activity at the cellular level, but preventing a billing surprise still depends on one low-tech habit: asking very specific questions.

Note: Medicare policies, contractor rules, health plan requirements, and cost-sharing amounts can change. This article is educational and does not provide medical, legal, or insurance advice. Confirm current coverage with Medicare, the health plan, the ordering provider, and the imaging facility.