Carol A. Mertins, APRN, BCAPRN, BCUnclaimed · claim itPsychiatric Nurse PractitionerWatertown, WI18+ years experienceRegistered with an NPI since 2008. National Provider Identifiers only began in 2005, so a provider who qualified earlier may have practiced for longer than this.(920) 206-7797NPI 1366606618View Profile Claim