Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Mary Margaret Oneill, CFNP

Individual provider Nurse Practitioner · NPI 1841374261

Mary Margaret Oneill, CFNP is a Nurse Practitioner in Adelphi, Maryland. Licensed in Maryland and Virginia. Registered with an NPI since 2006.

Licensed in
MD, VA
In the registry since
2006
Specialties on file
2

Practice location Address checks out

1801 Metzerott Rd
Adelphi, MD 20783
Phone: (301) 434-0500
Fax: (301) 434-1962
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Nurse Practitioner (primary) Taxonomy 363L00000X · Licence AC000300 (MD)
Nurse Practitioner Taxonomy 363L00000X · Licence 0024129639 (VA)

Record details

NPI number1841374261
Entity typeIndividual (Type 1)
GenderFemale
Credentials CFNP
Sole proprietorNo
NPI enumeratedOctober 24, 2006
Last updated in NPPESJuly 8, 2007