In a randomized controlled trial, Chien et al.1 evaluated the effectiveness of physician-targeted price transparency on physicians’ ordering rate for common imaging studies and procedures. A total of 1205 physicians in an accountable care organization (ACO) (Atrius Health) were block randomized to receive no price display, a single price, or an internal and external price on the test-ordering screen of their electronic health record. The authors found no significant difference across the groups on overall, inappropriate, or appropriate orders and orders for tests to be conducted internally.

The study is remarkable in several respects. It is the largest randomized controlled trial in this area with sufficient sample size to detect differences and minimize potential bias across groups. It was conducted in real clinical settings with a relatively long study period. More importantly, the study was conducted within the context of ACO. Created by the Patient Protection and Affordable Care Act, ACOs are incentivized to reduce cost while maintaining or improving quality of care. It is reasonable to assume that physicians within ACOs may be more cost conscious and willing to reduce medical waste if they are given convenient ways to access price information. However, this study rejected this assumption and found that sharing price information with physicians may not change physicians’ ordering behavior.

It is important to note some limitations to this study. First, the patient population included significantly fewer Medicaid and Medicare beneficiaries compared to the US or Massachusetts population.2 Wealthier patients and physicians treating those patients are less sensitive to medical costs. Second, most of the physicians in ACOs are still compensated by productivity.3 It would be interesting to know whether completely salary-based physicians would act differently. In these regards, I agree with the authors that further research is necessary to evaluate “contextual, motivational, and behavioral factors” that may affect the study findings.