John L. Herzog Sr., MD
NPI 1093734949ActiveIndividual· Internal Medicine, Cardiovascular Disease· Greenville, MS
Internal Medicine, Cardiovascular Disease (MD) in Greenville, Mississippi, trained at University of Mississippi School of Medicine (class of 1981). Their prescriptions cost Medicare Part D more than their services did: $1,257,138 for 7,217 claims, against $664,347 paid for services in 2024. Penumbra, Inc. was the largest of 9 companies reporting payments in 2025, $943.94 in all, mostly food and beverage.
Overview
| NPI | 1093734949 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Jul 19, 2006 |
| Last updated in NPPES | Aug 21, 2020 |
| Certified by provider | Aug 21, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Cardiovascular Disease Primary | 207RC0000X | 09800 | MS |
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 - Cardiovascular Disease (Cardiology) (MS) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,041 |
|---|---|
| Services billed | 12,714 across 88 procedure codes |
| Paid by Medicare | $664,347 |
Part D prescriptions in 2024
| Prescriptions (claims) | 7,217 · 15,592 30-day fills |
|---|---|
| Patients | 855 |
| Total drug cost | $1,257,138 |
| Generic share | 81% of claims |
Education and affiliations
| Medical school | University of Mississippi School of Medicine |
|---|---|
| Graduation year | 1981 |
| Medicare specialty | Cardiovascular Disease (Cardiology) |
| Secondary specialties | Internal Medicine |
Medical groups
- Delta Medical GroupGreenville, MS · 48 clinicians
- Delta Heart and Vascular Center, P.A.Indianola, MS · 4 clinicians
Hospital affiliations
- Bolivar Medical CenterCleveland, MS
- Delta Health System - the Medical CenterGreenville, MS
- Greenwood Leflore HospitalGreenwood, MS
- Northwest Missississippi Regional Medical CenterClarksdale, MS
- South Sunflower County HospitalIndianola, MS
Other facilities
- Delta Health- the Medical Center (Hospice)Hospice · Greenville, MS
- Grace Community HospiceHospice · Hollandale, MS
- Allegiance Specialty Hospital of GreenvilleLong-term care hospital · Greenville, MS
- Ms Care Center of GreenvilleNursing home · Greenville, MS
Industry payments (Open Payments)
- 2025$943.94 · 28 payments from 9 companies
- 2024$1,810 · 30 payments from 13 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Penumbra, Inc. | $316.16 | 6 |
| Medtronic, Inc. | $251.87 | 4 |
| Merck Sharp & Dohme LLC | $152.66 | 8 |
| Philips North America LLC | $78.79 | 4 |
| Boston Scientific Corporation | $50.46 | 1 |
What the 2025 payments were for
- Food and Beverage$943.94 · 28 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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