For some strange reason I was mailed an extra Discover card which prompted me to call customer service. I had a great experience talking to the rep who quickly fixed things on their end (so I did not have to "activate" my new card since I had no need of it and it wasn't ORANGE) and she got around to alerting me to the current 5% Cashback Bonus program Discover is running until 3/31. You have to enroll to get the benefit and then you are eligible for 5% cash back on the following health related purchases:
Doctors and Dentist visits (including chiropractors, optometrists, et al)
Bonus spending is capped at $1500 (therefore $75 cash back). I enrolled even though I double I'll be purchasing these types of items or services before 3/31 (I don't think my chiropractor takes Discover...)
She indicated that Discover would continue to run periodic 5% cash back bonus programs on certain types of purchases and to check back often to enroll either by calling or visiting their website. I'm not sure it's enough to make me use the card much more, but it's worth keeping an eye on.