Health Care Use of ACA Marketplace Enrollees During the COVID-19 Pandemic.

The onset of the COVID-19 pandemic in March 2020 had a sudden and substantial impact on health care utilization for most, if not all, individuals. We study the impact the pandemic had on the population insured in the individual and small group markets under the Patient Protection and Affordable Care Act (ACA) of 2010, using administrative claims data from January 2019 through December 2021. Our results demonstrated how health care utilization differed between the acute phase (i.e., 2020) and the post-acute phase (i.e., 2021) compared with the pre-pandemic phase. We found that in the ACA markets, most spending and utilization categories decreased drastically during the initial months of the pandemic and recovered by the end of 2021. While the role of telehealth among office visits decreased substantially by the end of 2021, it remained the main mode of delivery for mental health services.