Note:
Unattributed Deaths for 2020 could be apportioned to all known causes To calculate a blunt apportionment, simply take the Unattributed Deaths for 2020 and divide by 9.
Source: The National Vital Statistics System (NVSS) of the The National Center for Health Statistics (NCHS) of the Centers for Disease Control (CDC) of the United States Congress produces what is known as the State and National Provisional Counts (SNPC) as part of their Vital Statistics Rapid Release (VSRR) program. Specifically, the SNPC has this report: Monthly and 12 Month-ending Number of Live Births, Deaths and Infant Deaths Report.
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