UnitedHealth Group's (NYSE:UNH) membership is set to climb in the wake of reform driven enrollment through health care exchanges and thanks to Medicaid reform.

However, investors are right to wonder whether UnitedHealth's second quarter results will prove that serving millions of new customers due to the Affordable Care Act is profit-friendly.

In the following slideshow, you'll see what drove UnitedHealth's first quarter earnings and what you should be looking for when UnitedHealth reports earnings on July 17th.