A new study has shown "that Black residents in counties with more Black physicians - whether or not they actually see those doctors - had lower mortality from all causes". https://www.statnews.com/2023/04/14/black-doctors-primary-care-life-expectancy-mortality/
In counties with more Black doctors, Black people live longer, ‘astonishing’ study finds

The study is the first to link a higher prevalence of Black doctors to longer life expectancy and lower mortality in Black populations.

STAT