Margaret A. O'Brien, R.D.
Registered Dietitian · Phoenix, AZ
Margaret A. O'Brien, R.D. is a registered dietitian with a practice address in Phoenix, Arizona, and NPI 1659331536, issued on Mar 24, 2006. Check the license (Arizona 554938, as entered in NPPES) with the Arizona board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Margaret A. O'Brien
- Credential
- R.D.
- Primary taxonomy
- Registered Dietitian 133V00000X
- License number
- 554938 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 1441 N 12TH St FL 2, Phoenix, AZ 85006
- Phone
- (602) 521-5200
- Enumerated
- Mar 24, 2006
- Record last updated
- Nov 8, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (602) 521-5201
- Medicaid ID
- 796708 AZ
- Medicare enrollment
- Enrolled (PECOS I20050427000510); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 1441 N 12TH St FL 2
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Aws Alameri, MDGastroenterology Physician1114423381
- Marisol Allen, MDStudent in an Organized Health Care Education/Training Program1073459210
- Lynna Alnimer, M.D.Gastroenterology Physician1215490461
- Deborah Bernadine ArtusPhysician Assistant1295571214
- Karina Avechuco, FNP-BCFamily Nurse Practitioner1770930067
- Noel Balli, DOStudent in an Organized Health Care Education/Training Program1437990413
Verify Margaret A. O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Arizona board licenses this profession
Search for license 554938Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 88.4 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Banner - University Physician Specialists LLCPhoenix, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
414 registered dietitian records list a practice address in Phoenix
They are 414 of the 31,399 NPPES records with a practice address in Phoenix, and 1,435 registered dietitian records in Arizona.
All 414 in Phoenix → All 1,435 in Arizona → Every provider in Phoenix →
Other registered dietitian records in Arizona
- Kylie Aaron, RDN, IBCLCTempe, AZ1962109124
- Taylor Aasand, RDNGilbert, AZ1164900478
- Jacquelin Abarca, RDTucson, AZ1982344495
- Hana Abdulaziz Feeney, RDTucson, AZ1194975029
- Lauren Abert, MS, RD,CDEPhoenix, AZ1023446358
- Desiderio Abeyta, RDNTucson, AZ1124579701
- Marissa Abeyta, MS, RD, CLCTucson, AZ1710866967
- Mia Abram, RDPhoenix, AZ1144929522
- Geni Acosta, RDPhoenix, AZ1437971520
- Austin Acree, MS, RDWhiteriver, AZ1790245587
Common questions
What is Margaret A. O'Brien, R.D.'s NPI number?
Margaret A. O'Brien, R.D.'s National Provider Identifier (NPI) is 1659331536, issued on Mar 24, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Margaret A. O'Brien, R.D. located?
The NPPES record lists a practice address at 1441 N 12TH St FL 2, Phoenix, AZ, 85006. Phone: (602) 521-5200. Providers update this record themselves, so call before visiting.
How can I verify Margaret A. O'Brien, R.D.'s license?
NPPES lists Arizona license number 554938, as entered by the provider. Search the Arizona board that licenses this profession; the NPPES record confirms identity only.
What is Margaret A. O'Brien, R.D.'s MIPS final score?
The 2023 MIPS final score is 88.4 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.