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Medical Error Is Not the Third Leading Cause of Death
(skeptoid.com)
In 2022 (the last year for which final numbers are available as of this writing), the leading causes (in order) were heart disease (703,000), cancer (608,000), followed by accidents, COVID-19, stroke, lower respiratory diseases, Alzheimer's, diabetes (at 101,000), and then the 98,000 number would rank only ninth.
Those are pretty general categories too. There's a lot of cancers and a lot of different sorts of heart disease. Not to mention an almost uncountable number of ways to die in an accident.