April 12, 2008 
Mark Farrah Associates recently published a study through AHIP around Medicare Part D. Here were a few of the takeaways:
- 80 companies offer stand-alone prescription drug plans (PDP).
- 17,409,974 people in PDP plans in 2008 (2.8% year-over-year increase).
- Medicare Advantage (MA) plans with drug coverage had a 15% year-over-year gain.
- Total Medicare population is 44.2M.
One of the key questions they were trying to answer is what is the untapped market size. Their estimates put the market at 1M-4.6M. But, I also found it interesting that they estimate that 3-11% of the eligible Medicare patients have Medicare as a secondary payor – a coordination of benefits (COB) opportunity?
Enabling Healthy Decisions 
what gets me is the “available or untapped market”. with the baby boomers starting to enter this category, there will be an exponential explosion of these numbers.