William Seng Tan, D.O.
NPI 1891112306ActiveIndividual· Family Medicine· Olympia Fields, IL
Family Medicine (D.O.) in Olympia Fields, Illinois, trained at Nova Southeastern College of Osteo Medicine (class of 2013). Their prescriptions cost Medicare Part D more than their services did: $674,743 for 7,881 claims, against $93,702 paid for services in 2024. Novo Nordisk Inc reported $24.24 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1891112306 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | Mar 21, 2014 |
| Last updated in NPPES | Dec 25, 2021 |
| Certified by provider | Dec 25, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | 036144064 | 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 - Family Practice (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 353 |
|---|---|
| Services billed | 5,387 across 31 procedure codes |
| Paid by Medicare | $93,702 |
Part D prescriptions in 2024
| Prescriptions (claims) | 7,881 · 17,002 30-day fills |
|---|---|
| Patients | 725 |
| Total drug cost | $674,743 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | Nova Southeastern College of Osteo Medicine |
|---|---|
| Graduation year | 2013 |
| Medicare specialty | Family Practice |
Hospital affiliations
- Advocate Christ Hospital & Medical CenterOak Lawn, IL
- Advocate Trinity HospitalChicago, IL
- Franciscan Health MunsterMunster, IN
- Franciscan Health Olympia & Chicago HeightsOlympia Fields, IL
- Ingalls Memorial HospitalHarvey, IL
Other facilities
- Advocate Home Health Care ServHome health agency · Oakbrook, IL
- Caress Home Health Care IncHome health agency · Skokie, IL
- Prime Home Care - Olympia FieldsHome health agency · Olympia Fields, IL
Industry payments (Open Payments)
- 2025$24.24 · 1 payment from 1 company
- 2024$22.88 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $24.24 | 1 |
What the 2025 payments were for
- Food and Beverage$24.24 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 29 family medicine physicians in Olympia Fields · All family medicine physicians in Illinois