Stephen Zale Fadem, MD
NPI 1144224163ActiveIndividual· Internal Medicine, Nephrology· Houston, TX
Internal Medicine, Nephrology (MD) in Houston, Texas, trained at University of Oklahoma College of Medicine (class of 1973). Their prescriptions cost Medicare Part D more than their services did: $639,351 for 869 claims, against $130,141 paid for services in 2024. Ardelyx, Inc. was the largest of 4 companies reporting payments in 2025, $408.35 in all, mostly food and beverage.
Overview
| NPI | 1144224163 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 8, 2005 |
| Last updated in NPPES | Sep 16, 2020 |
| Certified by provider | Sep 16, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | E3262 | TX |
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 - Nephrology (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 106 |
|---|---|
| Services billed | 1,458 across 16 procedure codes |
| Paid by Medicare | $130,141 |
Part D prescriptions in 2024
| Prescriptions (claims) | 869 · 1,877 30-day fills |
|---|---|
| Patients | 127 |
| Total drug cost | $639,351 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | University of Oklahoma College of Medicine |
|---|---|
| Graduation year | 1973 |
| Medicare specialty | Nephrology |
| Telehealth | Offers telehealth |
Medical group
- Kidney Associates, PLLCHouston, TX · 8 clinicians
Other facilities
- Davita Houston Kidney Center SouthwestDialysis facility · Houston, TX
- Davita Lone Star DialysisDialysis facility · Houston, TX
- Davita Med Center DialysisDialysis facility · Houston, TX
- Davita Northstar Dialysis CenterDialysis facility · Houston, TX
- Davita Northwest Kidney CenterDialysis facility · Houston, TX
Industry payments (Open Payments)
- 2025$408.35 · 8 payments from 4 companies
- 2024$2,383 · 13 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Ardelyx, Inc. | $177.89 | 2 |
| Akebia Therapeutics Inc | $141.46 | 2 |
| Novartis Pharmaceuticals Corporation | $64.01 | 3 |
| Fresenius USA Marketing, Inc. | $24.99 | 1 |
What the 2025 payments were for
- Food and Beverage$408.35 · 8 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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