We examined the number of patients with or without COVID-19 admitted to general wards, ICUs, and psychiatric wards. We extracted claim codes corresponding to the use of oxygen administration, artificial respiration, and ECMO as respiratory support and counted the number of patients who received these medical treatments. Furthermore, the use of sedatives, corticosteroids, and anticoagulants, which were feared to be depleted during the pandemic, was assessed. We then counted the total amount of drugs used in vials, ampoules, tablets, capsules, and more. Regarding the implementation status of tests for diagnosing COVID-19, we classified the codes according to whether the detection target was nucleic acid or antigen, and whether the test was outsourced or not. Subsequently, we counted the number of tests performed. To validate the total medical expenses invested in patients with COVID-19, we stratified and validated the total insurance claims and public subsidies by age and COVID-19 status. Dental claims were excluded from this tabulation. Infectious disease experts determined the codes used for tabulation. We calculated the sum of claims for insurance claims and public subsidies, stratified by patients’ age and presence of COVID-19, followed by verification.