Sara Elizabeth Tan Yap, MD
NPI 1225514334ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Bourbonnais, IL
Internal Medicine, Endocrinology, Diabetes & Metabolism (MD) with Riverside Health System, practicing in Bourbonnais, Illinois. Their prescriptions cost Medicare Part D more than their services did: $498,285 for 1,055 claims, against $36,711 paid for services in 2024. Insulet Corporation was the largest of 5 companies reporting payments in 2025, $130.91 in all, mostly food and beverage. Lists Presence St Marys Hospital and 1 other hospital as hospital affiliations.
Overview
| NPI | 1225514334 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 12, 2018 |
| Last updated in NPPES | Sep 8, 2023 |
| Certified by provider | Sep 8, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | 036162611 | IL |
| Internal Medicine | 207R00000X | 125.071666 | IL |
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 - Endocrinology (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 156 |
|---|---|
| Services billed | 690 across 9 procedure codes |
| Paid by Medicare | $36,711 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,055 · 2,349 30-day fills |
|---|---|
| Patients | 156 |
| Total drug cost | $498,285 |
| Generic share | 27% of claims |
Education and affiliations
| Graduation year | 2015 |
|---|---|
| Medicare specialty | Endocrinology |
Medical group
- Riverside Health SystemWillmington, IL · 199 clinicians
Hospital affiliations
- Presence St Marys HospitalKankakee, IL
- Riverside Medical CenterKankakee, IL
Industry payments (Open Payments)
- 2025$130.91 · 6 payments from 5 companies
- 2024$140.59 · 6 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Insulet Corporation | $47.92 | 2 |
| Sequel Med Tech, LLC | $27.45 | 1 |
| Novo Nordisk Inc | $22.22 | 1 |
| Xeris Pharmaceuticals, Inc. | $18.30 | 1 |
| Amgen Inc. | $15.02 | 1 |
What the 2025 payments were for
- Food and Beverage$130.91 · 6 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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