Diane Flershem, M.D.
NPI 1447205869ActiveIndividual· Internal Medicine· Arlington Heights, IL
Internal Medicine (M.D.) in Arlington Heights, Illinois, trained at Rush Medical College of Rush University (class of 1994). Their prescriptions cost Medicare Part D more than their services did: $487,251 for 7,985 claims, against $287,208 paid for services in 2024. Amgen Inc. was the largest of 16 companies reporting payments in 2025, $1,719 in all, mostly food and beverage.
Overview
| NPI | 1447205869 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 24, 2006 |
| Last updated in NPPES | Feb 25, 2011 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 036095157 | 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 | 537 |
|---|---|
| Services billed | 5,374 across 60 procedure codes |
| Paid by Medicare | $287,208 |
Part D prescriptions in 2024
| Prescriptions (claims) | 7,985 · 18,767 30-day fills |
|---|---|
| Patients | 684 |
| Total drug cost | $487,251 |
| Generic share | 88% of claims |
Education and affiliations
| Medical school | Rush Medical College of Rush University |
|---|---|
| Graduation year | 1994 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Riverside Medical S CArlington Heights, IL · 8 clinicians
Hospital affiliations
- Advocate Lutheran General HospitalPark Ridge, IL
- Northshore University Healthsystem - Evanston HospitalEvanston, IL
- Northwest Community Hospital 1Arlington Heights, IL
- Northwestern Lake Forest HospitalLake Forest, IL
- Northwestern Medicine Central Dupage HospitalWinfield, IL
Other facilities
- Residential Home HealthHome health agency · Schaumburg, IL
Industry payments (Open Payments)
- 2025$1,719 · 88 payments from 16 companies
- 2024$6,758 · 92 payments from 14 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $340.97 | 21 |
| Lilly USA, LLC | $205.48 | 11 |
| Novo Nordisk Inc | $193.08 | 7 |
| Pfizer Inc. | $189.48 | 8 |
| Astrazeneca Pharmaceuticals LP | $160.80 | 10 |
What the 2025 payments were for
- Food and Beverage$1,719 · 88 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 93 internal medicine physicians in Arlington Heights · All internal medicine physicians in Illinois