Quick answers
- Where does Margaret A. O'Brien see patients?
- Medicare's clinician data lists 1 practice location in Phoenix, AZ. Call before your visit to confirm the address.
- What is Margaret A. O'Brien's specialty?
- Medicare lists Registered Dietitian or Nutrition Professional as the primary specialty.
- Does Margaret A. O'Brien accept Medicare assignment?
- Yes. Medicare's clinician data says Margaret A. O'Brien accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does Margaret A. O'Brien offer telehealth?
- Medicare's clinician data says Margaret A. O'Brien offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Margaret A. O'Brien?
- (844) 242-4664, as listed in official Medicare / NPI Registry data.
- What is Margaret A. O'Brien's NPI number?
- 1659331536. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Margaret A. O'Brien is enrolled with Medicare (CMS data updated 2026-10-02).
- 1441 N 12th St, Fl 2Phoenix, AZ 85006 (844) 242‑4664
Group practices
Medicare enrollment lists Margaret A. O'Brien as a member of this group (CMS data updated 2026-10-02).
- Banner - University Physician Specialists LLC348 clinicians in the group
Specialties
Find other clinicians: Registered Dietitian or Nutrition Professional, Arizona →
Other dietitians in Phoenix
Clinicians with the same Medicare primary specialty in Phoenix, AZ — not a recommendation.
Clinician information
| Credential | MNT |
|---|---|
| Graduation year | 1979 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1659331536 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians