Charles Berkelhammer, MD
NPI 1457359697ActiveIndividual· Specialist· Oak Lawn, IL
Specialist (MD) with Gi Partners of Illinois PLLC, practicing in Oak Lawn, Illinois. Their prescriptions cost Medicare Part D more than their services did: $1,865,886 for 3,802 claims, against $242,628 paid for services in 2024. Abbvie Inc. was the largest of 18 companies reporting payments in 2025, $1,928 in all, mostly food and beverage. Lists Advocate Christ Hospital & Medical Center and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1457359697 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 12, 2005 |
| Last updated in NPPES | Jan 27, 2009 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Specialist Primary | 174400000X | 036-068946 | 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 - Gastroenterology (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,064 |
|---|---|
| Services billed | 2,176 across 49 procedure codes |
| Paid by Medicare | $242,628 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,802 · 7,853 30-day fills |
|---|---|
| Patients | 941 |
| Total drug cost | $1,865,886 |
| Generic share | 87% of claims |
Education and affiliations
| Graduation year | 1980 |
|---|---|
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical group
- Gi Partners of Illinois PLLCLibertyville, IL · 39 clinicians
Hospital affiliations
- Advocate Christ Hospital & Medical CenterOak Lawn, IL
- Northwestern Medicine Central Dupage HospitalWinfield, IL
- Osf Little Company of Mary Medical CenterEvergreen Park, IL
- Palos Community HospitalPalos Heights, IL
- Silver Cross Hospital and Medical CentersNew Lenox, IL
Industry payments (Open Payments)
- 2025$1,928 · 91 payments from 18 companies
- 2024$1,305 · 73 payments from 16 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $438.70 | 32 |
| Takeda Pharmaceuticals U.S.A., Inc. | $280.71 | 13 |
| Madrigal Pharmaceuticals | $216.07 | 5 |
| Aimmune Therapeutics, Inc. | $142.89 | 7 |
| Gilead Sciences, Inc. | $135.17 | 8 |
What the 2025 payments were for
- Food and Beverage$1,928 · 91 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 30 Specialist providers in Oak Lawn · All Specialist providers in Illinois