DR. RONALD SIERZENSKI (M.D.) – Emergency Medicine Physician, NPI 1861428633
Emergency Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,181 EMERGENCY MEDICINE in AZ
Loading map...
Provider Addresses for DR. RONALD SIERZENSKI (M.D.)
1539, East Tulsa Street, Ashland Ranch, Gilbert, Maricopa County, Arizona, 85295, United States
GILBERT, AZ 852965554
Phone:
Type: Mailing
South Dobson Road, Chandler, Maricopa County, Arizona, 85248, United States
CHANDLER, AZ 852245605
Phone: (480) 963-4561
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
Loading prescription activity...
Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2004-04-26
PECOS data refreshed: 2026-06-15
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20040426001706 | I | Emergency Medicine | AZ | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99285 | Emergency department visit with high level of medical decision making | 55 | 55 | $0 |
| 99183 | Management of oxygen chamber therapy | 42 | 16 | $0 |
| 99284 | Emergency department visit with moderate level of medical decision making | 36 | 36 | $0 |
| 99291 | Critical care, first 30-74 minutes | 19 | 19 | $0 |
Insurance plans in this area (ZIP 85296)
Loading plans...
Group practice members
| Name | Specialty | State |
|---|---|---|
| Physician Assistant | AZ | |
| Physician Assistant | AZ | |
| - | AZ | |
| - | AZ | |
| - | AZ | |
| - | AZ | |
| Physician Assistant | AZ | |
| Emergency Medicine, General Practice | AZ | |
| - | ID |
Reviews
All reviews are moderated before publication. Reviews reflect users' opinions; we do not verify the accuracy of individual reviews.
No reviews yet. Be the first to share your experience — your opinion helps families compare providers.