Joining in on this post as I also applied to MUSC for fall 2017. I've worked in healthcare administration for about 6 years (first 5 in Pedi Hem/Onc and remaining in Neonatology), Bachelors in Economics, currently volunteer at a youth homeless shelter in seattle, and have shadowed in two NICUs and in the inpatient and outpatient cancer units in Boston. I've applied to a few other places and am waiting to hear back from Umass Amherst, NEU, UIC (i just interviewed with them), OHSU, and MUSC.
For the pre-re deficiencies, this almost nearly gave me a heart attack so I emailed the admissions coordinator. The deficiencies didn't mean I didn't complete them, it meant that I was waived but there's no way to indicate that on the progress screen. I would email Katie Patterson if you are worried about what the pre-req deficiencies might mean in your case because mine was for English Composition and Microbiology.