Quick answers
- Which hospitals does John D. Mason work at?
- Medicare's official clinician data lists John D. Mason at 2 hospitals: East Valley ER & Hospital and HonorHealth Tempe Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John D. Mason see patients?
- Medicare's clinician data lists 3 practice locations, including Tempe, AZ, Florence, AZ and Gilbert, AZ. Call before your visit to confirm the address.
- What is John D. Mason's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does John D. Mason accept Medicare assignment?
- Yes. Medicare's clinician data says John D. Mason 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 John D. Mason?
- (480) 784-5500, as listed in official Medicare / NPI Registry data.
- What is John D. Mason's NPI number?
- 1023090099. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John D. Mason works
Medicare's Facility Affiliation Data lists John D. Mason at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- East Valley ER & HospitalGilbert, AZ · Acute Care Hospital · CCN 030153
- HonorHealth Tempe Medical CenterPhoenix, AZ · Acute Care Hospital · CCN 030037
Practice locations
Addresses where John D. Mason is enrolled with Medicare (CMS data updated 2026-10-02).
- 1500 S Mill AveTempe, AZ 85281 (480) 784‑5500
- 4545 N Hunt HwyFlorence, AZ 85132 (520) 868‑3333
- 5656 S Power RdGilbert, AZ 85295 (602) 830‑4911
Group practices
Medicare enrollment lists John D. Mason as a member of these groups (CMS data updated 2026-10-02).
- Usacs Emergency Medicine of Arizona LLC35 clinicians in the group
- East Valley Ep PLLC15 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Tempe
Clinicians with the same Medicare primary specialty in Tempe, AZ — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2000 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1023090099 |
| 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