Estephan N. Zayat, MD
NPI 1558361261ActiveIndividual· Internal Medicine, Gastroenterology· Wichita, KS
Internal Medicine, Gastroenterology (MD) with Kansas Gastroenterology LLC, practicing in Wichita, Kansas. Their prescriptions cost Medicare Part D more than their services did: $1,879,269 for 1,735 claims, against $384,375 paid for services in 2024. Janssen Biotech, Inc. was the largest of 15 companies reporting payments in 2025, $1,064 in all, mostly food and beverage. Lists Ascension Via Christi Hospitals Wichita, Inc. and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1558361261 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 22, 2005 |
| Last updated in NPPES | Aug 3, 2022 |
| Certified by provider | Aug 3, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 04-25555 | KS |
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 - Gastroenterology (KS) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 720 |
|---|---|
| Services billed | 13,747 across 75 procedure codes |
| Paid by Medicare | $384,375 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,735 · 2,656 30-day fills |
|---|---|
| Patients | 502 |
| Total drug cost | $1,879,269 |
| Generic share | 80% of claims |
Education and affiliations
| Graduation year | 1991 |
|---|---|
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Kansas Gastroenterology LLCWichita, KS · 20 clinicians
Hospital affiliations
- Ascension Via Christi Hospitals Wichita, Inc.Wichita, KS
- Kansas Medical Center LLCAndover, KS
- Susan B Allen Memorial HospitalEl Dorado, KS
- Wesley Medical CenterWichita, KS
- William Newton HospitalWinfield, KS
Industry payments (Open Payments)
- 2025$1,064 · 43 payments from 15 companies
- 2024$1,461 · 42 payments from 17 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $163.41 | 6 |
| Medtronic, Inc. | $136.21 | 2 |
| Takeda Pharmaceuticals U.S.A., Inc. | $130.16 | 7 |
| Lilly USA, LLC | $123.84 | 1 |
| Abbvie Inc. | $102.44 | 4 |
What the 2025 payments were for
- Food and Beverage$1,064 · 43 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 20 gastroenterologists in Wichita · All gastroenterologists in Kansas