Did Ronald Reagan put medicine into the hands of the Insurance companies?

Did Ronald Reagan put medicine into the hands of the Insurance companies?
I remember before Reagan became president that I could take 100% of all medical expenses off on my taxes. Now I have to have medical insurance and so do a lot of other people.

From here:

A Wikipedia summary of what can currently be deducted:

I don’t know when the changes occured, or if they occured all at once. There was some major tax revision in the mid-'80s. I was a taxpayer in the '70s and I couldn’t deduct 100% of medical expenses.