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Updated ACC/AHA guidelines published in March 2026 give coronary artery calcium scans a central role in deciding whether some adults should begin preventive treatment. The opinion article discusses a scan costing about $100 as a way to detect disease before a heart attack, but it does not establish that Medicare will cover the test or that scans prevent heart attacks.
Updated national guidelines from the American College of Cardiology and American Heart Association give coronary artery calcium scans a central role in assessing some adults’ heart disease risk, a change that could inform decisions about preventive treatment. In an October 25 opinion article, cardiologists Arthur Agatston and Oren Mechanic discuss broader use of the roughly $100 scan to detect artery disease before a heart attack and compare its cost with that of emergency care.
The March 2026 guidelines recommend a calcium scan for adults at borderline or intermediate risk when the decision to start preventive treatment, such as a statin, remains uncertain. The scan detects calcified plaque in coronary arteries. The authors say it takes about 10 minutes, costs roughly $100, and uses a fraction of the radiation of a standard chest CT.
Agatston and Mechanic contrast imaging with standard risk calculators, which estimate the likelihood of coronary disease using factors including age, cholesterol, blood pressure, diabetes and smoking. A scan instead looks for evidence of plaque, they write. A score of zero may support classifying a patient’s risk downward, while a score above 100 may point toward medication and more intensive lifestyle measures. Treatment decisions still require clinical evaluation.
To illustrate, the authors describe a 52-year-old patient, identified under a changed name, whose risk calculator placed him in a low-risk category. His scan showed a calcium score of 220, which the authors describe as substantial plaque for his age. They say the result changed their assessment of whether medication was appropriate. The example is a clinician account, not a population-level study finding.
A New Role in Prevention Decisions
The guideline change may affect how clinicians approach patients whose risk is not clearly high or low. For those people, identifying plaque could provide information beyond a calculation based on conventional risk factors and help guide a discussion about preventive treatment. The authors say a zero score may help some patients avoid medication they do not need; it does not, by itself, settle every patient’s treatment decision.
The authors discuss the issue in terms of healthcare spending and access: they estimate the scan costs about $100 and cite a $50,000 figure for heart attack care. The article does not provide a Medicare payment policy change or a study showing that covering scans would save a particular amount. Whether patients can get the test covered may affect access, since the authors say some people currently pay out of pocket.
home blood pressure monitor upper arm
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How Guidelines Reframed Calcium Scans
According to the authors, calcium scanning has accumulated evidence over more than three decades but played only a peripheral role in national guidance until the March 2026 ACC/AHA update. They attribute the delay in part to clinical tools designed around population-level risk factors, cautious guideline processes and insurance coverage limits. Their account is an argument about how medical systems adopt evidence, rather than a formal review of all barriers to use.
The article also points to artificial intelligence as a possible route to finding calcification on chest CT scans already taken for other reasons. The authors say AI could standardize detection and prompt follow-up, and that newer AI-based methods are being used to assess soft plaque. They present these applications as developing possibilities, not as proof that automated analysis prevents heart attacks or is routinely available to patients.
“when possible, measure the disease.”
— Arthur Agatston, MD, and Oren Mechanic, MD, MPH, in their MedPage Today opinion article
Coverage and Outcomes Still Open
The article does not say that Medicare has agreed to pay $100 for calcium scans, nor does it identify a new reimbursement rule. Its headline is an argument for preventive spending, not confirmation of a Medicare benefit change. The source also does not specify how often insurers cover the test or provide a detailed estimate of out-of-pocket costs across plans.
The guideline recommendation applies to a defined group: adults with borderline or intermediate risk whose treatment choice remains uncertain. The article does not claim that everyone should be screened. It also does not provide trial results quantifying how many heart attacks the scans prevent, or the population-wide costs and benefits of expanded screening. The authors’ patient example and discussion of AI are not substitutes for those data.
Coverage and Clinical Use Ahead
The immediate development is the updated guideline recommendation; the source reports no scheduled Medicare decision or implementation deadline. The next practical questions are whether clinicians and insurers adopt the guidance, how often eligible patients receive scans, and whether coverage changes reduce out-of-pocket barriers.
Clinicians will need to apply the recommendation to individual risk and treatment discussions. Any broader use of AI to read existing scans will also depend on clinical validation, reporting practices and access. The opinion article calls for more attention to prevention, but it does not announce a policy proposal with a timetable.
Key Questions
What did the 2026 guidelines change?
The March 2026 ACC/AHA guidelines gave coronary artery calcium scans a central role for adults with borderline or intermediate risk when the decision about preventive treatment remains uncertain.
Does Medicare now cover the scan?
The source article does not report a Medicare coverage decision. Its headline argues that prevention deserves investment; it is not evidence that Medicare has adopted a new payment policy.
Who may be considered for a calcium scan?
The recommendation described by the authors applies to adults at borderline or intermediate risk when a clinician and patient remain uncertain about starting preventive therapy. It is not presented as a recommendation for everyone.
What does a calcium score show?
The scan detects calcified plaque in coronary arteries. The authors say a score of zero may support a lower risk classification, while a score above 100 may indicate a need to consider preventive treatment. Results should be interpreted in a clinical setting.
Can AI find heart disease on other scans?
The authors say AI can identify calcification on chest CT scans taken for other reasons and describe newer analysis of soft plaque. They present these uses as developing tools, not proof that automated analysis prevents heart attacks.
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