All areas in England are expected by National Health Service (NHS) England to develop integrated care systems (ICSs) by April 2021. ICSs bring together primary, secondary and community health services, and involve local authorities and the voluntary sector. ICSs build on previous pilots, including the Integrated Care Pioneers in 25 areas from November 2013 to March 2018. This analysis tracks the Pioneers’ self-reported progress, and the facilitators and barriers to improve service coordination over three years, longer than previous evaluations in England. The paper aims to discuss these issues.