Kathleen A. Mahan, MD
NPI 1639100464ActiveIndividual· Family Medicine· Lombard, IL
Family Medicine (MD) in Lombard, Illinois, trained at Loyola University of Chicago, Stritch School of Medicine (class of 2002). Their prescriptions cost Medicare Part D more than their services did: $177,504 for 2,897 claims, against $62,287 paid for services in 2024. Pfizer Inc. reported $24.85 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1639100464 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 6, 2006 |
| Last updated in NPPES | Dec 6, 2016 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | 4301093916 | MI |
| Internal Medicine | 207R00000X | 4301093916 | MI |
| Pediatrics | 208000000X | 4301093916 | MI |
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 - Internal Medicine (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 173 |
|---|---|
| Services billed | 2,056 across 82 procedure codes |
| Paid by Medicare | $62,287 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,897 · 7,284 30-day fills |
|---|---|
| Patients | 286 |
| Total drug cost | $177,504 |
| Generic share | 90% of claims |
Education and affiliations
| Medical school | Loyola University of Chicago, Stritch School of Medicine |
|---|---|
| Graduation year | 2002 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Pediatric Medicine |
| Telehealth | Offers telehealth |
Medical group
- Dupage Medical Group LtdWinfield, IL · 1,322 clinicians
Hospital affiliation
- Elmhurst Memorial HospitalElmhurst, IL
Other facilities
- Residential Home HealthHome health agency · Lisle, IL
Industry payments (Open Payments)
- 2025$24.85 · 1 payment from 1 company
- 2024$32.96 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $24.85 | 1 |
What the 2025 payments were for
- Food and Beverage$24.85 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 35 family medicine physicians in Lombard · All family medicine physicians in Illinois