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Thomas Greene had been experiencing pain in his right leg, a complication from diabetes, when doctors recommended a procedure to increase blood flow to the limb.

Retired from a career as an electrician and HVAC technician, he had an outpatient procedure in April 2021 to alleviate his pain by dilating the clogged artery using a balloon snaked into his blood vessel.

Greene, who lives in Oxford, Pennsylvania, came through the procedure without any problems, and it reduced his discomfort, said his wife, Bluizer Greene. She spoke with KFF Health News on behalf of Greene, who is recovering from other health problems.

Greene is covered by Medicare and a supplemental policy through Humana and did not expect to pay anything for the care, Bluizer said.

, is covered by original Medicare and a Medicare supplement policy sold by Humana.

 Peripheral artery bypass surgery on Greene's right leg.

 The operation was performed at Jennersville Hospital in West Grove, Pennsylvania, 

. Anesthesia services were provided by two providers who work for North American Partners in Anesthesia, which is 

 and, with thousands of providers operating in 21 states, identifies itself as among 

the nation's largest anesthesia staffing companies

 For the anesthesia care, North American Partners in Anesthesia billed $2,965.58: $1,334.51 for a certified nurse anesthetist and $1,631.07 for an anesthesiologist.

 North American Partners in Anesthesia, or NAPA, pursued Greene to pay for his anesthesia care instead of billing Medicare on time

sending the debt to collections before the couple discovered the problem. 

Medicare eventually received the claims from NAPA, months after Bluizer said they started receiving collections letters. But Medicare denied them because they were filed late — nearly 17 months after the surgery. Humana also denied the claims.

 to submit claims within a year of providing their services. And Medicare supplemental policies, like Greene's plan from Humana, generally do not pay for services if Medicare doesn't cover them, whether because Medicare has not paid its part yet or because the program denied the claim.

A year after Greene's surgery, in spring 2022, the couple opened a letter from a collections agency working on behalf of the anesthesia group. It demanded Greene pay about $3,000.

"Something has to be to be wrong, because this is the first time my husband has ever been asked to pay out-of-pocket and we've had the same insurance for years," Bluizer said.

She said for several months she called NAPA and the collections agency, C.tech Collections, of Mount Sinai, New York, to determine why it was billing her husband.

Greene was also contacted by the Faloni Law Group, a second organization working on behalf of NAPA to collect the debt, and Bluizer said she followed its instructions to respond by mail, disputing the debt on the grounds that it should be billed to insurance.

But her communication attempts did not resolve the issue, and she said her husband continued to receive collections notices.

Neither debt collector responded to requests for comment.

"We were angry, and it was very upsetting because we had never had a bill put into a collection agency for any of his hospitalizations, and it was money we did not feel that we owed," Bluizer said.

She said they may have received some letters from the anesthesia group in 2021 and 2022 that they discarded without opening because they believed her husband's medical bills would be covered by insurance, as the rest of his surgery bills were.

Worried about the situation, including its potential impact on their credit, the couple reached out late last year to Harold Ting, a volunteer counselor for 

, which provides free assistance to Medicare beneficiaries. Medicare generally covers anesthesia services.

"This is totally unfair that a beneficiary ends up having to pay for what should be a totally covered service, when the provider is at fault," Ting said.

Two explanation of benefits statements from Humana show the insurer received claims from NAPA in April 2021, shortly after Greene's surgery. The statements said the claims could not be considered at that time, though, because Humana had not yet received Medicare EOBs for the services.

Kelli LeGaspi, a Humana spokesperson, declined to comment on Greene's case. She said a Medicare EOB — a coverage statement generated when the program processes a claim — is required for the supplement carrier to consider a claim. Without it, a claim for secondary coverage cannot be considered and is denied, she said.

Supplement plans deny claims for benefits that are denied by Medicare, she said.

"If Original Medicare declines to pay the claim, then the Medicare supplement plan is required to decline the claim as well," she said.

In December 2022, a NAPA representative told Bluizer in an email that NAPA billed Medicare after the April 2021 surgery and that Medicare denied the claims in August 2021. The representative provided an account statement showing the claims were sent to collections that month.

But Bluizer said a Medicare representative told her in late 2021 that the program had received no claims from NAPA.

Greene's Medicare account shows NAPA filed claims in September 2022, about 17 months after his surgery and about five months after he received his first collections letter. Both claims were denied.

A quarterly summary notice said while the time limit for filing the claims had expired, Greene also could not be billed.

Meena Seshamani, director of the federal Center for Medicare, said in an email to KFF Health News that if a Medicare provider sends a claim a year or more after a service is provided, it is denied except in very rare circumstances.

There is no exception for provider error, she said.

A spokesperson for NAPA declined to be interviewed on the record, despite receiving a signed release waiving federal privacy protections.

Martine G. Brousse, a billing expert and founder of the patient advocacy firm AdviMedPRO, said Greene's Medicare notice should have reassured the couple that he did not owe anything, despite the several overdue-bill notices they received.

If the Medicare statement "shows a zero balance to the member, then the provider cannot legally go after the patient," said Brousse, who is not involved in Greene's case. "The patient has zero liability because it is not their fault" the provider billed Medicare more than a year after the surgery. "That is the end of the story."

Another mystery about the claim is why NAPA billed separately for a nurse anesthetist and an anesthesiologist. Bluizer said her husband was not told why NAPA billed individually for the two medical professionals — a practice that some insurers believe constitutes double billing.

Brousse said there could be a simple explanation, such as if the nurse anesthetist started the procedure and the anesthesiologist finished it or if the company charged for the anesthesiologist to work in a supervisory role.

But the Medicare claims document shows each provider billed for the same amount of time — a little over an hour.

"As far as I can tell, this looks like two providers billed with the same 'I did the job' Medicare procedure code," she said. "Medicare cannot accept that without an explanation."

 Unable to get answers, Ting connected Greene to the nonprofit, Pennsylvania-based 

Center for Advocacy for the Rights and Interests of Elders

In March, Ariel Rabinovic, an advocate with the center, contacted NAPA on Greene's behalf and explained that federal law does not allow the group to bill Medicare patients for services Medicare does not cover. He said he was told the company would stop billing Greene.

Bluizer said the couple has not received any collections notices since then.

situations where health providers who agree to accept Medicare try to bill patients for services Medicare does not cover, which is not allowed.

"Older folks have a lot of things going on, and dealing with this can be very confusing for them," he said. "A lot of people end up paying because they don't want to deal with it."

Greene has faced several health issues and spent time in a rehabilitation hospital this winter. His wife said she was happy the billing issue had been resolved without their having to pay anything.

 When a Medicare statement says the patient may not be billed anything for a health service, that's the bottom line. Don't write a check, but also don't ignore bills and collections notices, because they could ultimately hurt your credit.

Read your mail, the experts said. While Greene was not responsible for paying the anesthesia bill given that Medicare said he did not owe anything, the couple may have prevented the debt from being sent to collections if they had responded to the anesthesia group's communications and confirmed it had Greene's insurance information, Brousse said.

Keep copies of bills and insurance statements, especially Medicare EOB documents, or follow them on an online portal.

The couple was smart to reach out to advocates for help resolving the issue when they could not do so on their own, Rabinovic said.

"This is why people need to read their notices from Medicare even when it says 'This is not a bill,'" he said.

Also, when an anesthesia bill includes charges for both a nurse anesthetist and an anesthesiologist, question the charges. Many insurers will not pay for both.

The Centers for Medicare & Medicaid Services recommend beneficiaries call 1-800-MEDICARE with questions about their care or bills or 

, formerly known as Kaiser Health News (KHN), is a national newsroom that produces in-depth journalism about health issues and is one of the core operating programs at 

 — the independent source for health policy research, polling, and journalism.

Emmarie Huetteman of KFF Health News edited the digital story, and Taunya English of KFF Health News edited the audio story. NPR's Will Stone edited the audio and digital story.

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Medicare was supposed to cover the entire cost of his procedure. But the anesthesia provider failed to file its claims in a timely manner and billed the patient instead.  

His doctors billed Medicare late. Then he got sent to collections for the $3,000 tab

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