Marek J. Grzeszczak, M.D.M.D.Unclaimed · claim itPediatric Critical Care MedicineJackson, TN20+ years experienceRegistered with an NPI since 2006. National Provider Identifiers only began in 2005, so a provider who qualified earlier may have practiced for longer than this.(731) 660-8759NPI 1659455053View Profile Claim