John Dawson Mason, MD
NPI 1023090099ActiveIndividual· Emergency Medicine· Tempe, AZ
Emergency Medicine (MD) with Usacs Emergency Medicine of Arizona LLC and 1 other group, practicing in Tempe, Arizona. In 2024 Medicare paid $4,647 for 41 patients, and Part D covered 70 of their prescriptions, 89% of them generic. Lists East Valley ER & Hospital and 1 other hospital as hospital affiliations.
Overview
| NPI | 1023090099 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Nov 16, 2005 |
| Last updated in NPPES | Apr 18, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Emergency Medicine Primary | 207P00000X | 31338 | AZ |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Emergency Medicine (AZ) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 41 |
|---|---|
| Services billed | 48 across 7 procedure codes |
| Paid by Medicare | $4,647 |
Part D prescriptions in 2024
| Prescriptions (claims) | 70 · 70 30-day fills |
|---|---|
| Patients | 55 |
| Total drug cost | $820.70 |
| Generic share | 89% of claims |
Education and affiliations
| Graduation year | 2000 |
|---|---|
| Medicare specialty | Emergency Medicine |
Medical groups
- Usacs Emergency Medicine of Arizona LLCTempe, AZ · 35 clinicians
- East Valley Ep PLLCGilbert, AZ · 15 clinicians
Hospital affiliations
- East Valley ER & HospitalGilbert, AZ
- Honorhealth Tempe Medical CenterPhoenix, AZ
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 15 emergency medicine physicians in Tempe · All emergency medicine physicians in Arizona