Quick answers
- Which hospitals does Marion E. Harrison Iii work at?
- Medicare's official clinician data lists Marion E. Harrison Iii at 1 hospital: Mayo Clinic Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Marion E. Harrison Iii see patients?
- Medicare's clinician data lists 1 practice location in Scottsdale, AZ. Call before your visit to confirm the address.
- What is Marion E. Harrison Iii's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Marion E. Harrison Iii accept Medicare assignment?
- Yes. Medicare's clinician data says Marion E. Harrison Iii 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 Marion E. Harrison Iii offer telehealth?
- Medicare's clinician data says Marion E. Harrison Iii offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Marion E. Harrison Iii?
- (480) 301-8000, as listed in official Medicare / NPI Registry data.
- What is Marion E. Harrison Iii's NPI number?
- 1801873633. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Marion E. Harrison Iii works
Medicare's Facility Affiliation Data lists Marion E. Harrison Iii at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mayo Clinic HospitalPhoenix, AZ · Acute Care Hospital · CCN 030103
Practice locations
Addresses where Marion E. Harrison Iii is enrolled with Medicare (CMS data updated 2026-10-02).
- 13400 E Shea BlvdScottsdale, AZ 85259 (480) 301‑8000
Group practices
Medicare enrollment lists Marion E. Harrison Iii as a member of this group (CMS data updated 2026-10-02).
- Mayo Clinic Arizona1,626 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Scottsdale
Clinicians with the same Medicare primary specialty in Scottsdale, AZ — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Virginia School Of Medicine |
| Graduation year | 1985 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1801873633 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- 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