We studied a primary care clinic transitioning to Meaningful Use stage 1 and a comparison clinic within the same health system. In the 6 months following implementation, after adjusting for confounders, mean systolic blood pressure worsened (+3.3 mm Hg; P = .004) in the intervention clinic compared with the comparison clinic. We did not see a change in the mean or proportion of patients meeting target goals for diabetes (hemoglobin A1c) or obesity (body mass index). Our findings suggest that the worsening of systolic blood pressure associated with Meaningful Use implementation is likely due to distractions of system changes negatively impacting health outcomes.