Ronald Sierzenski, M.D.
NPI 1861428633ActiveIndividual· Emergency Medicine· Chandler, AZ
Emergency Medicine (M.D.) in Chandler, Arizona, trained at Jefferson Medical College of Thomas Jefferson University (class of 1997). Mostly services rather than prescriptions: Medicare paid $16,162 for 118 patients in 2024, with only 34 Part D claims.
Overview
| NPI | 1861428633 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 24, 2006 |
| Last updated in NPPES | Apr 22, 2010 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Emergency Medicine Primary | 207P00000X | 28468 | AZ |
| Emergency Medicine, Emergency Medical Services | 207PE0004X | 28468 | AZ |
| Emergency Medicine, Undersea and Hyperbaric Medicine | 207PE0005X | 28468 | 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); Practitioner - Emergency Medicine (KS) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 118 |
|---|---|
| Services billed | 173 across 11 procedure codes |
| Paid by Medicare | $16,162 |
Part D prescriptions in 2024
| Prescriptions (claims) | 34 · 34 30-day fills |
|---|---|
| Patients | 22 |
| Total drug cost | $2,577 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | Jefferson Medical College of Thomas Jefferson University |
|---|---|
| Graduation year | 1997 |
| Medicare specialty | Emergency Medicine |
Medical group
- Valley Hyperbarics LLCChandler, AZ · 6 clinicians
Hospital affiliations
- Chandler Regional Medical CenterChandler, AZ
- Mercy Gilbert Medical CenterGilbert, 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 51 emergency medicine physicians in Chandler · All emergency medicine physicians in Arizona