STEFANIE M DIAZ (M.D.) – Nephrology Physician, NPI 1689723637
Nephrology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,168 NEPHROLOGY in TX
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Provider Addresses for STEFANIE M DIAZ (M.D.)
1133, Medical Drive, Tyler, Smith County, Texas, 75701, United States
TYLER, TX 757012130
Phone: (903) 595-5486
Fax: (903) 595-5128
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 14 Open Payments records for all available years, with a total value of $401.
Total Amount is formed as General ($401) + Research ($0) + Ownership ($0) = $401.
Last reported payment date: 2024-10-21 • Largest payer in this snapshot: AstraZeneca Pharmaceuticals LP ($116).
Total Amount
$401
General + Research + Ownership
Payments
14
Total payment records
General Amount
$401
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-10-21
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| AstraZeneca Pharmaceuticals LP | $116 |
| Fresenius USA Marketing, Inc. | $93 |
| GlaxoSmithKline, LLC. | $55 |
| Amgen Inc. | $53 |
| Ascendis Pharma Inc | $41 |
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: 2010-01-08
PECOS data refreshed: 2026-05-27
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 |
|---|---|---|---|---|
| I20100108000832 | I | Nephrology | TX | 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 |
|---|---|---|---|---|
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 426 | 154 | $0 |
| 90970 | Dialysis services, per day, less than full month service (20 years or older) | 184 | 11 | $0 |
| 90960 | Dialysis services, 4 or more physician visits per month (20 years or older) | 158 | 51 | $0 |
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 145 | 87 | $0 |
| 90935 | Hemodialysis procedure with physician evaluation | 118 | 55 | $0 |
Insurance plans in this area (ZIP 75701)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| NEPHROLOGY | TX | 90935 | Hemodialysis procedure with one physician evaluation | 294 | 127 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| - | TX | |
| Critical Care (Intensivists), Pulmonary Disease | TX | |
| Orthopedic Surgery | TX | |
| - | TX | |
| - | TX | |
| - | TX | |
| - | TX | |
| Internal Medicine | TX | |
| - | TX | |
| Physician Assistant | TX |
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