It would help to add past 5 year averages to make it clear just how unusual the R0-R99 death numbers are. See https://episphere.github.io/mortalitytracker/#cause=symptoms_signs_and_abnormal&state=All%20States from my comment on the previous post. These numbers have been at a constant <500/week every week of 2015-2019. They’re now at 2800 and seemingly rising.
It’s gone from one of the lowest ranked causes of death to like #4 cause of death.
As to hypotheses why… who determines how deaths are classified? Is it state level? Do states need to send samples to the CDC to get them classified? It’s clearly too simple to just assume that it’s a pure hospital level process.