https://jamanetwork.com/journals/jama/fullarticle/2720029
https://khn.org/news/health-care-industry-spends-30b-a-year-pushing-its-wares-from-drugs-to-stem-cell-treatment/
Aritcle in JAMA says that “From 1997 through 2016, medical marketing expanded substantially, and spending increased from $17.7 to $29.9 billion”.
For comparison, overall US health care spending was about $3.5 trillion in 2017.