Kenneth C. Gray, PhD, M.D., N.D.P.H.D,M.D., N.D.Unclaimed · claim itNaturopathBolingbrook, IL13+ years experienceRegistered with an NPI since 2013. National Provider Identifiers only began in 2005, so a provider who qualified earlier may have practiced for longer than this.(630) 914-5065NPI 1427486778View Profile Claim