Marvin D. Seppala, M.D.M.D.Unclaimed · claim itAddiction Medicine (Neurology/Ps…Newberg, OR20+ 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.(503) 554-4334NPI 1548329055View Profile Claim