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Elizabeth Melville and her husband are gradually hiking all 48 mountain peaks that top 4,000 feet in New Hampshire.

"I want to do everything I can to stay healthy so that I can be skiing and hiking into my 80s — hopefully even 90s!" said Melville, a 59-year-old part-time ski instructor who lives in the vacation town of Sunapee.

So when her primary care doctor suggested she be screened for colorectal cancer in September, Melville dutifully prepped for her colonoscopy and went to New London Hospital's outpatient department for what was supposed to be a zero-cost procedure.

 every 10 years starting at age 45. But more frequent screenings are often recommended for people with a history of polyps, since polyps can be a precursor to malignancy. Melville had had a benign polyp removed during a colonoscopy nearly six years earlier.

Melville's second test was similar to her first one: normal, except for one small polyp that the gastroenterologist snipped out while she was sedated. It too was benign. So she thought she was done with many patients' least favorite medical obligation for several years.

 Elizabeth Melville, 59, is covered under a Cigna health plan that her husband gets through his employer. It has a $2,500 individual deductible and 30% coinsurance.

 A screening colonoscopy, including removal of a benign polyp.

, a 25-bed facility in New London, New Hampshire. It is part of the 

 system, a nonprofit academic medical center and regional network of five hospitals and more than 24 clinics with nearly $3 billion in annual revenue.

 $10,329 for the procedure, anesthesiologist, and gastroenterologist. Cigna's negotiated rate was $4,144, and Melville's share under her insurance was $2,185.

 The Affordable Care Act made preventive health care such as mammograms and colonoscopies free of charge to patients without cost sharing. But there is wiggle room to charge when a procedure is done for diagnosis versus for screening purposes. Often the doctors and hospitals are the ones who decide when those categories shift and a patient can be charged — but those decisions often are debatable.

Getting screened regularly for colorectal cancer is one of the most effective tools people have for preventing it. Screening colonoscopies 

 of getting colorectal cancer by 52% and the risk of dying from it by 62%, according to a recent analysis of published studies.

The U.S. Preventive Services Task Force, a nonpartisan group of medical experts, 

 colorectal cancer screening for average-risk people from ages 45 to 75.

Colonoscopies can be classified as for screening or for diagnosis. How they are classified makes all the difference for patients' out-of-pocket costs. The former generally incurs no cost to patients under the ACA; the latter can generate bills.

The Centers for Medicare & Medicaid Services has 

 that under the preventive services provisions of the ACA, removal of a polyp during a screening colonoscopy is considered an integral part of the procedure and should not change patients' cost-sharing obligations.

After all, that's the whole point of screening — to figure out whether polyps contain cancer, they must be removed and examined by a pathologist.

Many people may face this situation. More than 40% of people over 50 have 

, according to the American Society for Gastrointestinal Endoscopy.

Someone whose cancer risk is above average may face higher bills and not be protected by the law, said Anna Howard, a policy principal at the American Cancer Society's Cancer Action Network.

Having a family history of colon cancer or a personal history of polyps raises someone's risk profile, and insurers and providers could impose charges based on that. "Right from the start, [the colonoscopy] could be considered diagnostic," Howard said.

In addition, getting a screening colonoscopy sooner than the recommended 10-year interval, as Melville did, could open someone up to cost-sharing charges, Howard said.

Coincidentally, Melville's 61-year-old husband had a screening colonoscopy at the same facility with the same doctor a week after she had her procedure. Despite his family history of colon cancer and a previous colonoscopy just five years earlier because of his elevated risk, her husband wasn't charged anything for the test. 

The key difference between the two experiences: Melville's husband didn't have a polyp removed.

 When Melville received notices about owing $2,185, she initially thought it must be a mistake. She hadn't owed anything after her first colonoscopy. But when she called, a Cigna representative told her the hospital had changed the billing code for her procedure from screening to diagnostic. A call to the Dartmouth Health billing department confirmed that explanation: She was told she was billed because she'd had a polyp removed — making the procedure no longer preventive.

During a subsequent three-way call that Melville had with representatives from both the health system and Cigna, the Dartmouth Health staffer reiterated that position, Melville said. "[She] was very firm with the decision that once a polyp is found, the whole procedure changes from screening to diagnostic," she said.

Dartmouth Health declined to discuss Melville's case with KHN even though she gave her permission for it to do so.

After KHN's inquiry, Melville was contacted by Joshua Compton of 

 on behalf of Dartmouth Health. Compton said the diagnosis codes had inadvertently been dropped from the system and that Melville's claim was being reprocessed, Melville said.

Cigna also researched the claim after being contacted by KHN. Justine Sessions, a Cigna spokesperson, provided this statement: "This issue was swiftly resolved as soon as we learned that the provider submitted the claim incorrectly. We have reprocessed the claim and Ms. Melville will not be responsible for any out of pocket costs."

 Melville didn't expect to be billed for this procedure. It seemed exactly like her first colonoscopy, nearly six years earlier, when she had not been charged for a polyp removal.

But before getting an elective procedure like a cancer screening, it's always a good idea to try to suss out any coverage minefields, Howard said. Remind your provider that the government's interpretation of the ACA requires that colonoscopies be regarded as a screening even if a polyp is removed.

"Contact the insurer prior to the colonoscopy and say, 'Hey, I just want to understand what the coverage limitations are and what my out-of-pocket costs might be,'" Howard said. Billing from an anesthesiologist — who merely delivers a dose of sedative — can also become an issue in screening colonoscopies. Ask whether the anesthesiologist is in-network.

Be aware that doctors and hospitals are required to give good faith estimates of patients' expected costs before planned procedures under the No Surprises Act, which took effect this year.

Take the time to read through any paperwork you must sign, and have your antennae up for problems. And, importantly, ask to see documents ahead of time.

Melville said that a health system billing representative told her that among the papers she signed at the hospital on the day of her procedure was one saying that if a polyp was discovered, the procedure would become diagnostic.

Melville no longer has the paperwork, but if Dartmouth Health did have her sign such a document, it would likely be 

 of the ACA. However, "there's very little, if any, direct federal oversight or enforcement" of the law's preventive services requirements, said Karen Pollitz, a senior fellow at KFF.

In a statement describing New London Hospital's general practices, spokesperson Timothy Lund said: "Our physicians discuss the possibility of the procedure progressing from a screening colonoscopy to a diagnostic colonoscopy as part of the informed consent process. Patients sign the consent document after listening to these details, understanding the risks, and having all of their questions answered by the physician providing the care."

To patients like Melville, that doesn't seem quite fair, though. She said, "I still feel asking anyone who has just prepped for a colonoscopy to process those choices, ask questions, and potentially say 'no thank you' to the whole thing is not reasonable."

Stephanie O'Neill contributed the audio portrait with this story.

Bill of the Month is a crowdsourced investigation by 

 that dissects and explains medical bills. Do you have an interesting medical bill you want to share with us? 

Health

Michelle Andrews

Author

Preventive care, like screening colonoscopies, is supposed to be free of charge to patients under the Affordable Care Act. But some hospitals haven't gotten the memo.

Cancer screenings like colonoscopies are supposed to be free. Hers cost $2,185

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