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

Margaret A O'Brien, RD

Individual provider Registered Dietitian · NPI 1659331536

Margaret A O'Brien, RD is a Registered Dietitian OR Nutrition Professional in Phoenix, Arizona. Qualified in 1979, 47 years ago. Practices with Banner - University Physician Specialists LLC, a 347-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Arizona.

Years since qualifying
47
Licensed in
AZ
In the registry since
2006
What do these letters mean?
RD — Registered Dietitian
A credentialed nutrition professional.

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Practice location Address checks out

1441 N 12th St Fl 2
Phoenix, AZ 85006-2837
Phone: (602) 521-5200
Fax: (602) 521-5201
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Registered Dietitian (primary) Taxonomy 133V00000X · Licence 554938 (AZ)

Record details

NPI number1659331536
Entity typeIndividual (Type 1)
GenderFemale
Credentials RD
Sole proprietorNo
NPI enumeratedMarch 24, 2006
Last updated in NPPESNovember 8, 2018

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyREGISTERED DIETITIAN OR NUTRITION PROFESSIONAL
Medical schoolOTHER
Graduated 1979 (47 years in practice)
Group practice Banner - University Physician Specialists Llc — 347 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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