Polsky, DanielWeiner, JanetZhang, Yuehan2023-05-222023-05-222017-09-012017-10-09https://repository.upenn.edu/handle/20.500.14332/38096This Issue Brief describes the breadth of physician networks on the ACA marketplaces in 2017. We find that the overall rate of narrow networks is 21%, which is a decline since 2014 (31%) and 2016 (25%). Narrow networks are concentrated in plans sold on state-based marketplaces, at 42%, compared to 10% of plans on federally-facilitated marketplaces. Issuers that have traditionally offered Medicaid coverage have the highest prevalence of narrow network plans at 36%, with regional/local plans and provider-based plans close behind at 27% and 30%. We also find large differences in narrow networks by state and by plan type.http://creativecommons.org/licenses/by-nd/4.0/narrow networksACAindividual marketplacehealthcareHealth and Medical AdministrationHealth EconomicsHealth PolicyHealth Services AdministrationInsuranceBrief