Brett Howard Herzog, MD PHD
NPI 1023499282ActiveIndividual· Internal Medicine, Medical Oncology· Shiloh, IL
Internal Medicine, Medical Oncology (MD PHD) in Shiloh, Illinois, trained at University of Oklahoma College of Medicine (class of 2015). 204 Medicare patients in 2024, $1,225,122 paid; nearly all of their 1,102 Part D prescriptions were generic (90%). Exelixis Inc. reported $121.23 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1023499282 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD PHD |
| Sole proprietor | No |
| NPI issued | Jun 13, 2015 |
| Last updated in NPPES | Apr 21, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Medical Oncology Primary | 207RX0202X | 036153509 | IL |
| Internal Medicine | 207R00000X | 036153509 | 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 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Medical Oncology (IL); Practitioner - Medical Oncology (MO) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 204 |
|---|---|
| Services billed | 40,761 across 93 procedure codes |
| Paid by Medicare | $1,225,122 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,102 · 1,286 30-day fills |
|---|---|
| Patients | 139 |
| Total drug cost | $478,298 |
| Generic share | 90% of claims |
Education and affiliations
| Medical school | University of Oklahoma College of Medicine |
|---|---|
| Graduation year | 2015 |
| Medicare specialty | Medical Oncology |
| Secondary specialties | Internal Medicine |
Medical groups
- Washington UniversitySaint Louis, MO · 3,029 clinicians
- Washington University Physicians in Illinois IncSaint Louis, MO · 175 clinicians
Hospital affiliations
- Alton Memorial HospitalAlton, IL
- Barnes Jewish HospitalSaint Louis, MO
- Barnes-Jewish St Peters HospitalSaint Peters, MO
- Good Samaritan Regional Hlth CenterMount Vernon, IL
- Memorial HospitalBelleville, IL
Industry payments (Open Payments)
- 2025$121.23 · 1 payment from 1 company
- 2024$162.51 · 3 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Exelixis Inc. | $121.23 | 1 |
What the 2025 payments were for
- Food and Beverage$121.23 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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