James A. Lengemann, MD
NPI 1447247572ActiveIndividual· Internal Medicine· Naperville, IL
Internal Medicine (MD) in Naperville, Illinois, trained at Loyola University of Chicago, Stritch School of Medicine (class of 1995). Their prescriptions cost Medicare Part D more than their services did: $164,161 for 2,184 claims, against $64,546 paid for services in 2024. Novo Nordisk Inc reported $17.48 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1447247572 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Oct 4, 2005 |
| Last updated in NPPES | Mar 5, 2021 |
| Certified by provider | Mar 5, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 036096442 | 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 - Internal Medicine (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 188 |
|---|---|
| Services billed | 772 across 29 procedure codes |
| Paid by Medicare | $64,546 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,184 · 6,184 30-day fills |
|---|---|
| Patients | 222 |
| Total drug cost | $164,161 |
| Generic share | 92% of claims |
Education and affiliations
| Medical school | Loyola University of Chicago, Stritch School of Medicine |
|---|---|
| Graduation year | 1995 |
| Medicare specialty | Internal Medicine |
Medical group
- Endeavor Health Medical GroupEvanston, IL · 3,350 clinicians
Hospital affiliations
- Edward HospitalNaperville, IL
- Elmhurst Memorial HospitalElmhurst, IL
- Loyola University Medical CenterMaywood, IL
- Swedish HospitalChicago, IL
Other facilities
- Residential Home HealthHome health agency · Lisle, IL
Industry payments (Open Payments)
- 2025$17.48 · 1 payment from 1 company
- 2024$368.29 · 3 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $17.48 | 1 |
What the 2025 payments were for
- Food and Beverage$17.48 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 114 internal medicine physicians in Naperville · All internal medicine physicians in Illinois