William G. Grehan, MD
NPI 1417961061ActiveIndividual· Anesthesiology· Melrose Park, IL
Anesthesiology (MD) with Advocate Health and Hospitals Corporation and 3 other groups, practicing in Melrose Park, Illinois. Medicare paid $35,821 for services to 279 patients in 2024. Becton, Dickinson and Company reported $17.28 in payments in 2025, mostly food and beverage. Lists Advocate Christ Hospital & Medical Center and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1417961061 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 28, 2006 |
| Last updated in NPPES | Sep 29, 2026 |
| Certified by provider | Sep 29, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Anesthesiology Primary | 207L00000X | 89895 | SC |
| Anesthesiology | 207L00000X | 036-082615 | IL |
| Anesthesiology | 207L00000X | 4051 | WI |
| Anesthesiology, Pain Medicine | 207LP2900X | 036-082615 | 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 - Anesthesiology (IL); Practitioner - Anesthesiology (SC); Practitioner - Anesthesiology (SD) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 279 |
|---|---|
| Services billed | 401 across 46 procedure codes |
| Paid by Medicare | $35,821 |
Education and affiliations
| Graduation year | 1988 |
|---|---|
| Medicare specialty | Anesthesiology |
Medical groups
- Advocate Health and Hospitals CorporationChicago, IL · 3,118 clinicians
- Cep America - Anesthesia PCRedding, CA · 849 clinicians
- Midwest Anesthesia Providers SCAlton, IL · 182 clinicians
- Black Hills Surgical Hospital LLCSpearfish, SD · 174 clinicians
Hospital affiliations
- Advocate Christ Hospital & Medical CenterOak Lawn, IL
- Black Hills Surgical Hospital LLCRapid City, SD
- Coastal Carolina HospitalHardeeville, SC
- Memorial HospitalBelleville, IL
- Novant Health Hilton Head Medical CenterHilton Head Island, SC
Industry payments (Open Payments)
- 2025$17.28 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Becton, Dickinson and Company | $17.28 | 1 |
What the 2025 payments were for
- Food and Beverage$17.28 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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