Posted on November 8, 2011
This entry was posted in Imaging Equipment.
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In the United States, patients treated by physicians who billed for both technical (practice/equipment) and professional (supervision/ interpretation) elements of nuclear and echocardiographic stress imaging tests were more prone to undergo such tests after coronary revascularization compared with patients of physicians who did not charge for these services, according to a recent study.
The study’s findings were published in the November 9, 2011, issue of the Journal of the American Medical Association (JAMA). “Cardiac stress testing procedures performed in the office setting can enable more rapid, efficient diagnostic testing and use of these procedures has increased significantly during the past decade. However, physician ownership of imaging equipment also could potentially induce testing in more discretionary situations, because the capital outlay for equipment is high and these investments must be recouped via procedure-related “technical fees,” which cover associated equipment and practice costs. Similar concerns have been raised regarding whether physicians who bill for the professional fees covering test interpretation might more often refer their own patients for these tests than those who do not bill for these services. However, little is known about how these reimbursement incentives might affect the routine use of cardiac stress testing,” according to the authors.
The American College of Cardiology Foundation (ACCF; Rockville, MD, USA) has published appropriateness utilization criteria (AUC) to provide guidance to clinicians for appropriate testing. Current AUC guidelines do not recommend routine testing within two years for patients undergoing percutaneous coronary intervention (PCI; procedures such as balloon angioplasty or stent placement used to open narrowed coronary arteries) or within five years for patients having coronary artery bypass graft (CABG) surgery, unless the need for stress testing is motivated by symptoms or events.
Bimal R. Shah, MD, MBA, from Duke University Medical Center (Durham, NC, USA, and colleagues assessed whether there was a link between patients undergoing cardiac stress imaging after coronary revascularization and the pattern of stress imaging billing of the physician practice providing their follow-up care. Using data from a US health insurance carrier, 17,847 patients were identified who between November 2004 and June 2007 had coronary revascularization and an index cardiac outpatient visit more than 90 days following the procedure. Based on overall billings, physicians were categorized into three classifications: physicians who routinely charged for technical and professional fees; physicians who regularly billed for professional fees only; and physicians who did not routinely bill for either service. Analytic models were used to evaluate the association between physician billing and use of stress testing, after adjusting for patient and other physician factors.
During the study period, the overall 30-day incidence of either nuclear stress testing or stress echocardiography testing associated with the index cardiac-related outpatient visit was 12.2%, with an overall incidence of 10.4% for nuclear stress testing and 1.8% for stress echocardiography. The incidence of nuclear stress testing among clinicians who billed for both technical and professional fees, professional-only fees, and neither fee for nuclear stress testing was 12.6%, 8.8%, and 5.0%, respectively. The stress echocardiography testing incidence among physicians who billed for both technical and professional fees, professional-only fees, and neither fee for stress echocardiography was 2.8%, 1.4%, and 0.4%, respectively.
Data analysis revealed that physicians who billed for technical and professional fees for nuclear stress testing and those who billed for professional fees only were more likely to perform nuclear stress tests following revascularization than those not billing (13.3% and 9.4% vs. 5.3%). Physicians who billed for technical and professional fees for stress echocardiography testing or professional fees only were more likely to perform stress echocardiography testing following revascularization than those not billing (3.1% and 1.5 percent vs. 0.5%).
The investigators reported that even though current ACCF AUC do not recommend regular use of early stress testing following coronary revascularization, they found that 12% of patients with a cardiac-related outpatient visit at least three months after revascularization underwent a stress test within 30 days of their visit. Moreover, up to one in 10 patients who were not classified as having symptoms at their outpatient visit still underwent stress testing.
“Our study highlights the need for application of the ACCF AUC in clinical practice and augments findings of other studies that have explicitly examined application of ACCF AUC for nuclear stress and stress echocardiography. The ACCF AUC provides guidance to clinicians regarding when to pursue cardiac stress testing to assist in narrowing variation in testing among clinicians and practices. Discretionary stress testing after revascularization has potential financial and clinical disadvantages for patients, including the costs of the tests, the exposure to ionizing radiation as well as potential down-stream costs, and consequences from following up false-positive test results,” the researchers concluded in their article. “These data suggest the need for broader application of AUC to minimize the possible influence of financial incentives on the decision to perform cardiac stress testing after revascularization.”
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