Accurate Measurement In California's Safety-Net Health Systems Has Gaps And Barriers.

Patient safety in ambulatory care has not been routinely measured. California implemented a pay-for-performance program in safety-net hospitals that incentivized measurement and improvement in key areas of ambulatory safety: referral completion, medication safety, and test follow-up. We present two years of program data (collected during July 2015-June 2017) and show both suboptimal performance in aspects of ambulatory safety and questionable reliability in data reporting.