Pitt went from #17 --> #14 on the USNWR rankings this year if it means anything to anyone. However, USNWR changed their methodology to account for more research $$$'s. Pitt is usually in the top 5 of schools receiving funds from the NIH, so the methodology change most likely explains the small bump in list rank. Additionally, it appears their "residency director rating" is unchanged, indicating the school did not receive a bump in overall reputation.
Regardless, you probably shouldn't be using the USNWR to choose a medical school. I only say this to state Pitt remains a solid school and is top 20, and continues to be recognized as such.