Benjamin Walker Warren, MD
NPI 1912402512ActiveIndividual· Internal Medicine, Gastroenterology· Loveland, CO
Internal Medicine, Gastroenterology (MD) with Centers for Gastroenterology, practicing in Loveland, Colorado. Their prescriptions cost Medicare Part D more than their services did: $12,496 for 64 claims, against $1,392 paid for services in 2024. Genzyme Corporation was the largest of 13 companies reporting payments in 2025, $870.78 in all, mostly food and beverage. Lists Medical Center of the Rockies and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1912402512 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Mar 26, 2018 |
| Last updated in NPPES | May 5, 2026 |
| Certified by provider | May 5, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 74830 | CO |
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 (CO); Practitioner - Gastroenterology (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 14 |
|---|---|
| Services billed | 16 across 5 procedure codes |
| Paid by Medicare | $1,392 |
Part D prescriptions in 2024
| Prescriptions (claims) | 64 · 145 30-day fills |
|---|---|
| Patients | 32 |
| Total drug cost | $12,496 |
| Generic share | 88% of claims |
Education and affiliations
| Graduation year | 2018 |
|---|---|
| Medicare specialty | Gastroenterology |
Medical group
- Centers for GastroenterologyLoveland, CO · 38 clinicians
Hospital affiliations
- Medical Center of the RockiesLoveland, CO
- Poudre Valley HospitalFort Collins, CO
- Uchealth Greeley HospitalGreeley, CO
Industry payments (Open Payments)
- 2025$870.78 · 24 payments from 13 companies
- 2024$3,115 · 26 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Genzyme Corporation | $219.49 | 4 |
| Abbvie Inc. | $192.90 | 5 |
| Conmed Corporation | $95.79 | 1 |
| Janssen Biotech, Inc. | $81.15 | 3 |
| Ovesco Endoscopy USA, Inc. | $74.75 | 1 |
What the 2025 payments were for
- Food and Beverage$870.78 · 24 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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