An interesting analysis of how medical spending increased (2004 to 2007) Average medical spending increased 34%, from $545 to $729 for all adults. Medical spending increased 42%, or $8,703, for the highest-cost 1% of adults Medical spending increased 39%, or $3,364, for the highest-cost 10% of adults Out-of-pocket spending grew 23%, or $85, for the lowest 50% of spenders