Medicaid spending increased dramatically during the 1990s, driven in part by spending for prescription drugs. From 1990 to 2000, Medicaid drug spending increased from $4.4 billion to over $20 billion, an average annual increase of 16.3 percent. Disabled persons experienced an even greater 20 percent average annual increase. By drug category in 1997 (for 29 States), the highest spending amount w...