Mary Ahn, MD
NPI 1407809056ActiveIndividual· Surgery· Winfield, IL
Surgery (MD) in Winfield, Illinois, trained at Loyola University of Chicago, Stritch School of Medicine (class of 1995). 147 Medicare patients in 2024, $65,299 paid; all of their 78 Part D prescriptions were generic. Axogen was the largest of 2 companies reporting payments in 2025, $1,577 in all, mostly travel and lodging.
Overview
| NPI | 1407809056 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | May 17, 2006 |
| Last updated in NPPES | Nov 13, 2025 |
| Certified by provider | Nov 13, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Surgery Primary | 208600000X | 036-096682 | 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 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - General Surgery (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 147 |
|---|---|
| Services billed | 312 across 22 procedure codes |
| Paid by Medicare | $65,299 |
Part D prescriptions in 2024
| Prescriptions (claims) | 78 · 78 30-day fills |
|---|---|
| Patients | 40 |
| Total drug cost | $295.78 |
| Generic share | 100% of claims |
Education and affiliations
| Medical school | Loyola University of Chicago, Stritch School of Medicine |
|---|---|
| Graduation year | 1995 |
| Medicare specialty | General Surgery |
Medical groups
- Northwestern Medical Faculty FoundationChicago, IL · 4,503 clinicians
- Central Dupage Physician GroupGeneva, IL · 1,080 clinicians
Hospital affiliations
- Northwestern Medicine Central Dupage HospitalWinfield, IL
- Northwestern Medicine Delnor Community HospitalGeneva, IL
- Northwestern Medicine McHenryMcHenry, IL
- Northwestern Memorial HospitalChicago, IL
Industry payments (Open Payments)
- 2025$1,577 · 17 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Axogen | $1,490 | 16 |
| Astrazeneca Pharmaceuticals LP | $86.49 | 1 |
What the 2025 payments were for
- Travel and Lodging$1,065 · 8 payments
- Food and Beverage$511.72 · 9 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Surgery providers in Winfield
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