Why Did My Screening Mammogram Turn Into a Bill?
A screening mammogram is free on most plans. So why the bill? Usually because the screening found something and you were called back for more imaging, or a routine screening got coded as diagnostic. Sometimes that bill is correct. Increasingly, it is not. Here is how to tell.
Was your mammogram billed correctly?
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What led to the bill?
The short answer
On most insurance (non-grandfathered ACA plans), a screening mammogram for women 40 and older is covered with no cost-sharing. A bill almost always traces to one of two things: the screening was miscoded as diagnostic, or the screening found something and you were called back for diagnostic imaging (a diagnostic mammogram or ultrasound) that carried cost-sharing.
The second one used to be a dead end. Not anymore, a growing number of states now require that diagnostic follow-up to be free too. Whether it applies to you depends on your state and your plan.
Where the bill is often wrong
A routine screening got billed as diagnostic
If you had no symptoms and this was your routine screening, it should be $0. A cost-share bill usually means it was coded with a diagnostic reason, or a separate 3D imaging charge was added that should have been part of the free screening. Both can be challenged.
You were called back for diagnostic imaging
As of 2025, more than 20 states require diagnostic and supplemental breast imaging (a diagnostic mammogram, ultrasound, or MRI) to be covered with no cost-sharing. If you live in one of those states and your plan is state-regulated, the callback bill may be improper. See your state protections.
Screening vs diagnostic vs supplemental: what is the difference?
Screening mammogram
A routine mammogram with no symptoms, for women 40 and older. Covered with no cost-sharing on ACA plans. This is the $0 category.
Diagnostic mammogram
Ordered because of a symptom or a finding on a screening (a callback). Historically carries cost-sharing, but more than 20 states now require it to be free.
Supplemental imaging
A breast ultrasound or MRI added for dense breasts or higher risk. Same state-law trend applies, some states now require these at no cost too.
The parts of a mammogram bill to check
- The screening vs diagnostic code, the single biggest driver of whether you owe anything.
- A separate 3D (tomosynthesis) charge that should usually be bundled into the free screening.
- The facility fee (hospital outpatient vs freestanding imaging center).
- The radiologist’s reading fee, sometimes billed by an out-of-network provider you never chose.
- Whether a state no-cost-sharing law covers your diagnostic or supplemental imaging.
What to do if you get a bill
- Compare the bill against your EOB, the EOB shows what your plan says you owe and why.
- Read the diagnosis and procedure codes. A routine screening coded as diagnostic is the most common cause of a wrongful bill. Our denial-code decoder helps.
- Check your state law on diagnostic and supplemental breast imaging, and whether your plan is fully insured or self-funded.
- Check the network status of the radiologist and facility.
- If it was wrongly cost-shared or denied, appeal it, you generally have 180 days.
Have us check the bill
Send us the bill and the EOB. CareRoute Bill Defense checks whether the screening was miscoded, whether your state requires the diagnostic imaging to be free, and whether any separate 3D or out-of-network charge is proper, then disputes what should not have been billed and negotiates the rest.
Send us the billFree to submit. You only pay if we save you money.
Frequently asked questions
Is a screening mammogram supposed to be free?
On most plans, yes. Non-grandfathered ACA-compliant plans must cover screening mammograms for women 40 and older with no cost-sharing, no copay, coinsurance, or deductible. The exceptions are grandfathered and non-ACA plans. Medicare also covers one screening mammogram a year at no cost for women 40 and older. So a bill for a routine screening mammogram is worth questioning before you pay.
Why did my mammogram turn into a bill?
Usually one of two reasons. Either the screening found something and you were called back for a diagnostic mammogram or breast ultrasound, which has historically carried cost-sharing, or a routine screening was miscoded as diagnostic. It can also be a separate charge for 3D imaging or an out-of-network reading. Comparing the bill to your EOB and checking the codes tells you which.
I was called back for a diagnostic mammogram or ultrasound. Do I owe cost-sharing?
It depends on your state and plan. Under federal law, diagnostic follow-up imaging can carry cost-sharing. But as of 2025, more than 20 states require diagnostic and supplemental breast imaging (a diagnostic mammogram, ultrasound, or MRI) to be covered with no cost-sharing. Those state laws apply to state-regulated (fully insured) plans, not to self-funded employer (ERISA) plans, which are exempt. So check your state and whether your plan is fully insured or self-funded.
What about 3D mammograms (tomosynthesis)?
Most plans now cover 3D mammography as part of the screening with no cost-sharing, but some older plans added a separate charge for it. If you see a separate 3D or tomosynthesis line on your bill, check whether it should have been included in the free screening, it may be challengeable.
What if I felt a lump or had symptoms?
Then the mammogram is legitimately diagnostic, and cost-sharing can apply, that part is usually not a billing error. But the bill is still negotiable, and any separate charges (facility fee, an out-of-network radiologist reading the images) can contain errors or be reduced.
Does Medicare cover mammograms?
Yes. Medicare covers one screening mammogram every 12 months at no cost for women 40 and older (and a baseline for ages 35 to 39). A diagnostic mammogram, ordered because of a symptom or finding, is covered but generally carries 20% coinsurance after the deductible.
Can CareRoute help with a mammogram bill?
Yes. CareRoute Bill Defense reads your bill and EOB, checks whether a screening was miscoded, whether your state requires the diagnostic imaging to be covered at no cost, and whether any separate 3D or out-of-network charge is proper, then disputes what should not have been billed and negotiates the rest. It is free to submit, and you only pay if we save you money.
Related
Sources & references
This is general information, not legal, medical, or insurance advice, and does not create a client relationship. Free-screening rules depend on your plan type (they do not apply to grandfathered or some non-ACA plans), state diagnostic-imaging laws vary and do not reach self-funded employer plans, and Medicare rules differ. Check your plan documents, your state insurance department, and your EOB. Last updated: August 2026.