Mary E. Wallace, DNP, CRNP, A-GNP-CDNP, CRNP, A-GNP-CUnclaimed · claim itNurse Practitioner, AdultOxon Hill, MD3+ years experienceRegistered with an NPI since 2023. National Provider Identifiers only began in 2005, so a provider who qualified earlier may have practiced for longer than this.(301) 292-9220NPI 1295503829View Profile Claim