Every summer, CMS releases a 200-page book on Medicare spending, with a few comparisons to national healthcare spending
It's out. This year's version is 208 pages and find it here:
Analyses are usually through 2020, sometimes through 2019.
Note that this year there's a special section on Laboratory Spending, 2005-2020. It's just one page (PDF 206, numbered 195). Lab spending rose from $7B to $B 2005-2012, then dipped in 2014-2016 (and that's before PAMA) in part I think due to bundling of many hospital lab tests to underlying hospital services. Typically hospital labs are 1/3 per year ($3B out of $9B). Frankly, the biggest lesson I see for lab spending is that it's been relatively flat from $8.6B in 2010 to $9.2B in 2020. Figure clipped at bottom.