Ioannis Papagiannis, M.D.
NPI 1043484561ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Chicago, IL
Internal Medicine, Endocrinology, Diabetes & Metabolism (M.D.) with Northwestern Medical Faculty Foundation, practicing in Chicago, Illinois. Their prescriptions cost Medicare Part D more than their services did: $713,125 for 1,658 claims, against $55,687 paid for services in 2024. Amgen Inc. reported $11,579 in payments in 2025, mostly speaking and faculty fees. Lists Northwestern Lake Forest Hospital and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1043484561 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Apr 15, 2008 |
| Last updated in NPPES | Apr 6, 2026 |
| Certified by provider | Apr 6, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | 036150945 | IL |
| Internal Medicine, Endocrinology, Diabetes & Metabolism | 207RE0101X | 47122 | TN |
| Internal Medicine, Endocrinology, Diabetes & Metabolism | 207RE0101X | 0437429 | KS |
| Internal Medicine | 207R00000X | 47122 | TN |
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 - Endocrinology (IL); Practitioner - Endocrinology (TN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 298 |
|---|---|
| Services billed | 775 across 26 procedure codes |
| Paid by Medicare | $55,687 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,658 · 4,092 30-day fills |
|---|---|
| Patients | 290 |
| Total drug cost | $713,125 |
| Generic share | 39% of claims |
Education and affiliations
| Graduation year | 2000 |
|---|---|
| Medicare specialty | Endocrinology |
| Telehealth | Offers telehealth |
Medical group
- Northwestern Medical Faculty FoundationChicago, IL · 4,503 clinicians
Hospital affiliations
- Northwestern Lake Forest HospitalLake Forest, IL
- Northwestern Medicine Central Dupage HospitalWinfield, IL
- Northwestern Medicine Delnor Community HospitalGeneva, IL
- Northwestern Memorial HospitalChicago, IL
- Palos Community HospitalPalos Heights, IL
Industry payments (Open Payments)
- 2025$11,579 · 25 payments from 1 company
- 2024$14,203 · 35 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $11,579 | 25 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$9,750 · 7 payments
- Travel and Lodging$1,098 · 6 payments
- Food and Beverage$730.01 · 12 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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