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Last year in Massachusetts, after finding lumps in her breast, Jessica Chen went to , part of Tufts Medicine, for a mammogram and sonogram. Before the screenings, she asked the hospital for the estimated patient responsibility for the bill using her insurance, Tufts Health Plan. Her portion, she was told, would be $359 — and she paid it. She was more than a little surprised weeks later to receive a bill asking her to pay an additional $1,677.51. “I was already trying to stomach $359, and this was many times higher,” Chen, a physician assistant, told me.

The No Surprises Act, which took effect in 2022, was rightly heralded as a landmark piece of legislation, which “protects people covered under group and individual health plans from receiving surprise medical bills,” according to the . And yet bills that take patients like Chen by surprise just keep coming.

With the help of her software-wise boyfriend, she found the complicated “machine-readable” master price list that hospitals are required to post online and looked up the negotiated rate between Lowell General and her insurer. It was $302.56 — less than she had paid out-of-pocket.

CMS is charged with enforcing the law, so Chen sent a complaint about the surprising bill to the agency. She received a terse email in return: “We have reviewed your complaint and have determined that the rights and protections of the No Surprises Act do not apply.”

When I asked the health system to explain how such a surprising off-estimate bill could be generated, Tufts Medicine spokesperson responded by email: “Healthcare billing is complex and includes various factors and data points, so actual charges for care provided may differ from initial estimates. We understand the frustration these discrepancies can cause.”

Here’s the problem: While the No Surprises Act has been a phenomenal success in taking on some unfair practices in the wild West of medical billing, it was hardly a panacea.

In fact, the measure protected patients primarily from only one particularly egregious type of surprise bill that had become increasingly common before the law’s enactment: When patients unknowingly got out-of-network care at an in-network facility, or when they had no choice but to get out-of-network care in an emergency. In either case, before President Donald Trump signed the law late in his first term, patients could be hit with tens or hundreds of thousands of dollars in out-of-network bills that their insurance wouldn’t pay.

The No Surprises Act also provided some protection from above-estimate bills, but at the moment, the protection is only , so it wouldn’t apply in Chen’s case since she was using health insurance.

But patients who do qualify generally are entitled to an up-front, good-faith estimate for treatment they schedule at least three business days in advance or if they request one. Patients can dispute a bill if it is more than $400 over the estimate. (The No Surprises Act also required what amounted to a good-faith estimate of out-of-pocket costs for patients with insurance, but that provision has not , since, nearly five years later, the government still has not issued rules about exactly what form it should take.)

So, surprising medical bills — bills that the patient could not have anticipated and never consented to — are still stunning countless Americans.

Jessica Robbins, who works in product development in Chicago, was certainly surprised when, out of the blue, she was recently billed $3,300 by Endeavor Health for a breast MRI she had received two years earlier, with prior authorization from her then-insurer, Blue Cross and Blue Shield of Illinois. In trying to resolve the problem, she found herself caught in a Kafkaesque circle involving dozens of calls and emails. The clinic where she had the procedure no longer existed, having been bought by Endeavor. And she no longer had Blue Cross.

“We are actively working with the patient and their insurer to resolve this matter,” Endeavor spokesperson Allie Burke said in an emailed response to my questions.

Mary Ann Bonita of Fresno, California, was starting school this year to become a nursing assistant when, on a Friday, she received a positive skin test for tuberculosis. Her school’s administration said she couldn’t return to class until she had a negative chest X-ray. When her doctor from Kaiser Permanente didn’t answer requests to order the test for several days, Bonita went to an emergency room and paid $595 up front for the X-ray, which showed no TB. So she and her husband were surprised to receive another bill, for $1,039, a month later, “with no explanation of what it was for,” said Joel Pickford, Bonita’s husband.

In the cases above, each patient questioned an expensive, unexpected medical charge that came as a shock — only to find that the No Surprises Act didn’t apply.

“There are many billing problems out there that are surprising but are not technically surprise bills,” Zack Cooper, an associate professor of economics at Yale University, told me. The No Surprises Act fixed a specific kind of charge, he said, “and that’s great. But, of course, we need to address others.”

Cooper’s research has found that before the No Surprises Act was passed, of emergency room visits yielded a surprise out-of-network bill.

CMS’ official No Surprises Help Desk has received tens of thousands of complaints, which it investigates, said Catherine Howden, a CMS spokesperson. “While some billing practices, such as delayed bills, are not currently regulated” by the No Surprises Act, Howden said, complaint trends nonetheless help “inform potential areas for future improvements.” And they are needed.

Michelle Rodio, a teacher in Lakewood, Ohio, had a lingering cough weeks after a bout of pneumonia that required treatment with a course of antibiotics. She went to Cleveland Clinic’s Lakewood Family Health Center for an examination. Her X-ray was fine. As was her nasal swab — except for the stunning $2,700 bill it generated.

“I said, ‘This is a surprise bill!’” Rodio recalled telling the provider’s finance office. The agent said it was not.

“So I said, ‘Next time I’ll be sure to ask the doctor for an estimate when I get a nose swab.’”

“The doctors wouldn’t know that,” the agent replied, as Rodio recalled — and indeed physicians generally have no idea how much the tests they order will cost. And in any case, Rodio was not legally entitled to a binding estimate, since the part of the No Surprises Act that grants patients with insurance that right has not been implemented yet.

So she was stuck with a bill of $471 (the patient responsibility portion of the $2,700 charge) that she couldn’t have consented to (or rejected) in advance. It was surprising — shocking to her, even — but not a “surprise bill,” according to the current law. But shouldn’t it be?

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