Quick answers
- Which hospitals does Walter J. Nieri work at?
- Medicare's official clinician data lists Walter J. Nieri at 1 hospital: Banner Boswell Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Walter J. Nieri see patients?
- Medicare's clinician data lists 1 practice location in Sun City, AZ. Call before your visit to confirm the address.
- What is Walter J. Nieri's specialty?
- Medicare lists Internal Medicine as the primary specialty, and also Geriatric Medicine.
- Does Walter J. Nieri accept Medicare assignment?
- Yes. Medicare's clinician data says Walter J. Nieri 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.
- What is the phone number for Walter J. Nieri?
- (623) 832-4000, as listed in official Medicare / NPI Registry data.
- What is Walter J. Nieri's NPI number?
- 1265488258. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Walter J. Nieri works
Medicare's Facility Affiliation Data lists Walter J. Nieri at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Banner Boswell Medical CenterSun City, AZ · Acute Care Hospital · CCN 030061
Practice locations
Addresses where Walter J. Nieri is enrolled with Medicare (CMS data updated 2026-10-02).
- 10401 W Thunderbird BlvdSun City, AZ 85351 (623) 832‑4000
Group practices
Medicare enrollment lists Walter J. Nieri as a member of this group (CMS data updated 2026-10-02).
- Banner Hospital Based Physicians Arizona LLC637 clinicians in the group
Specialties
- Internal Medicineprimary
- Geriatric Medicinealso
Other internal medicine doctors in Sun City
Clinicians with the same Medicare primary specialty in Sun City, AZ — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1968 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1265488258 |
| 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