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

Dr. Mary Ellen O'Brien, NMD, FNP

Individual provider Naturopath · NPI 1285750240

Dr. Mary Ellen O'Brien, NMD, FNP is a Naturopath in Tempe, Arizona. Practices as a sole proprietor. Licensed in Arizona.

Licensed in
AZ
In the registry since
2007
Specialties on file
2
What do these letters mean?
FNP — Family Nurse Practitioner
A nurse practitioner who treats patients of all ages, much like a family doctor.

See every abbreviation used in this directory →

Practice location Address checks out

2127 E Baseline Rd Ste 103
Tempe, AZ 85283-1537
Phone: (480) 491-1716
Fax: (480) 491-5920
Show map & directions

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

Specialties & licences

Family Nurse Practitioner (primary) Taxonomy 363LF0000X · Licence RN087042 (AZ)
Naturopath Taxonomy 175F00000X · Licence 97-514 (AZ)

Record details

NPI number1285750240
Entity typeIndividual (Type 1)
GenderFemale
Credentials NMD , FNP
Sole proprietorYes
NPI enumeratedMarch 22, 2007
Last updated in NPPESSeptember 11, 2025

Other providers in Tempe