In paparazzi photos obtained by BACKGRID.com, the Black Panther star was dropped off at the emergency room by his fiancée, Taylor Simone at Santa Monica Medical Center.
Boseman, 43, was hospitalized weeks after fans expressed concern over his skeletal appearance. His drastic weight loss was explained away as weight loss for a movie role.
The news comes 2 days after comedian DL Hughley collapsed onstage during a comedy routine in Nashville, Tennessee.
Hughley, 57, took to social media to explain he was diagnosed with COVID-19 but he was asymptomatic. Hughley postponed his tour to quarantine at his home for 14 days.
California is experiencing an all-time high in coronavirus cases following much-publicized public gatherings and protests in that state.
On Saturday, Gov. Gavin Newsom reported a spike of 4,515 new cases — a record for most new cases of coronavirus in a single day.