A paper in the journal Health Affairs published in the June 2020 issue estimates that direct medical costs incurred during the course of the infection range from $163.4 billion if 20% of the population gets infected to $654.0 billion if 80% of the population becomes infected.
The paper can be obtained at https://www.healthaffairs.org/doi/pdf/10.1377/hlthaff.2020.00426.