Douglas R. Adler, MD
NPI 1255313367ActiveIndividual· Internal Medicine, Gastroenterology· Glenview, IL
Internal Medicine, Gastroenterology (MD) in Glenview, Illinois, licensed in IL, with an NPI issued in November 2005. Their prescriptions cost Medicare Part D more than their services did: $612,324 for 697 claims, against $94,318 paid for services in 2024. Celltrion USA Inc. was the largest of 3 companies reporting payments in 2025, $185.06 in all, mostly food and beverage.
Overview
| NPI | 1255313367 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Nov 15, 2005 |
| Last updated in NPPES | Apr 24, 2017 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 036060472 | IL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 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 | 342 |
|---|---|
| Services billed | 2,165 across 25 procedure codes |
| Paid by Medicare | $94,318 |
Part D prescriptions in 2024
| Prescriptions (claims) | 697 · 1,429 30-day fills |
|---|---|
| Patients | 240 |
| Total drug cost | $612,324 |
| Generic share | 75% of claims |
Industry payments (Open Payments)
- 2025$185.06 · 3 payments from 3 companies
- 2024$1,339 · 57 payments from 20 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Celltrion USA Inc. | $124.06 | 1 |
| Ipsen Biopharmaceuticals, Inc | $31.43 | 1 |
| Madrigal Pharmaceuticals | $29.57 | 1 |
What the 2025 payments were for
- Food and Beverage$185.06 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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