Hospital Information: Outpatient Cost to Charge Ratio - History KESSLER INSTITUTE FOR REHAB Click here to download this table. Ratio Effective Date 026.07% 1/1/2023 025.04% 1/1/2022 025.11% 1/1/2021 029.08% 1/1/2020 032.16% 1/1/2019 035.94% 1/1/2018 039.06% 1/1/2017 040.37% 11/1/2016