Diane Marie Heidmann, MD
NPI 1003100629ActiveIndividual· Internal Medicine· Chicago, IL
Internal Medicine (MD) in Chicago, Illinois, trained at Rush Medical College of Rush University (class of 2011). Their prescriptions cost Medicare Part D more than their services did: $463,982 for 5,073 claims, against $106,533 paid for services in 2024.
Overview
| NPI | 1003100629 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | May 31, 2011 |
| Last updated in NPPES | May 12, 2016 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 036135078 | IL |
| Internal Medicine | 207R00000X | 125-059287 | 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 | 281 |
|---|---|
| Services billed | 1,333 across 35 procedure codes |
| Paid by Medicare | $106,533 |
Part D prescriptions in 2024
| Prescriptions (claims) | 5,073 · 12,163 30-day fills |
|---|---|
| Patients | 426 |
| Total drug cost | $463,982 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | Rush Medical College of Rush University |
|---|---|
| Graduation year | 2011 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Northwestern Medical Faculty FoundationChicago, IL · 4,503 clinicians
- Chesterton Physical Therapy IncChesterton, IN · 186 clinicians
Hospital affiliations
- Northwestern Lake Forest HospitalLake Forest, IL
- Northwestern Medicine Central Dupage HospitalWinfield, IL
- Northwestern Memorial HospitalChicago, IL
- Palos Community HospitalPalos Heights, IL
Other facilities
- Home Care ExpertsHome health agency · Burr Ridge, IL
- Shirley Ryan AbilitylabInpatient rehabilitation facility · Chicago, IL
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 3,299 internal medicine physicians in Chicago · All internal medicine physicians in Illinois