William H. Kobak, M.D.
NPI 1023007887ActiveIndividual· Obstetrics & Gynecology, Gynecology· St Charles, IL
Obstetrics & Gynecology, Gynecology (M.D.) in St Charles, Illinois, trained at Indiana University School of Medicine (class of 1989). Their prescriptions cost Medicare Part D more than their services did: $64,700 for 279 claims, against $13,227 paid for services in 2024. Boston Scientific Corporation reported $181.97 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1023007887 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Oct 14, 2005 |
| Last updated in NPPES | Jan 29, 2025 |
| Certified by provider | Jan 29, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Obstetrics & Gynecology, Gynecology Primary | 207VG0400X | 036091917 | IL |
| Obstetrics & Gynecology | 207V00000X | 036091917 | IL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Obstetrics/Gynecology (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 75 |
|---|---|
| Services billed | 162 across 22 procedure codes |
| Paid by Medicare | $13,227 |
Part D prescriptions in 2024
| Prescriptions (claims) | 279 · 554 30-day fills |
|---|---|
| Patients | 87 |
| Total drug cost | $64,700 |
| Generic share | 78% of claims |
Education and affiliations
| Medical school | Indiana University School of Medicine |
|---|---|
| Graduation year | 1989 |
| Medicare specialty | Obstetrics/Gynecology |
| Telehealth | Offers telehealth |
Medical groups
- The Board of Trustees of the University of IllinoisChicago, IL · 1,150 clinicians
- Cook CountyChicago, IL · 788 clinicians
Hospital affiliations
- John H Stroger Jr HospitalChicago, IL
- University of Illinois Hospital and ClinicsChicago, IL
Industry payments (Open Payments)
- 2025$181.97 · 2 payments from 1 company
- 2024$13.18 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Boston Scientific Corporation | $181.97 | 2 |
What the 2025 payments were for
- Food and Beverage$181.97 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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