John Carter Hemphill, MD
NPI 1912188897ActiveIndividual· Internal Medicine, Interventional Cardiology· Chattanooga, TN
Internal Medicine, Interventional Cardiology (MD) in Chattanooga, Tennessee, trained at University of South Carolina School of Medicine (class of 2001). Their prescriptions cost Medicare Part D more than their services did: $1,494,817 for 7,854 claims, against $127,668 paid for services in 2024. Shockwave Medical, Inc was the largest of 13 companies reporting payments in 2025, $778.77 in all, mostly food and beverage.
Overview
| NPI | 1912188897 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Nov 19, 2007 |
| Last updated in NPPES | Sep 12, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Interventional Cardiology Primary | 207RI0011X | 47332 | TN |
| Internal Medicine, Cardiovascular Disease | 207RC0000X | 47332 | TN |
| Internal Medicine, Cardiovascular Disease | 207RC0000X | M1137 | TX |
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 - Cardiovascular Disease (Cardiology) (GA); Practitioner - Cardiovascular Disease (Cardiology) (TN); Practitioner - Interventional Cardiology (TN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 733 |
|---|---|
| Services billed | 2,167 across 43 procedure codes |
| Paid by Medicare | $127,668 |
Part D prescriptions in 2024
| Prescriptions (claims) | 7,854 · 20,062 30-day fills |
|---|---|
| Patients | 972 |
| Total drug cost | $1,494,817 |
| Generic share | 83% of claims |
Education and affiliations
| Medical school | University of South Carolina School of Medicine |
|---|---|
| Graduation year | 2001 |
| Medicare specialty | Cardiovascular Disease (Cardiology) |
| Secondary specialties | Interventional Cardiology |
Medical group
- Memorial Health Care System Inc.Hixson, TN · 56 clinicians
Hospital affiliations
- Commonspirit-Memorial Hospital-North GeorgiaRinggold, GA
- Memorial Healthcare System, IncChattanooga, TN
- Rhea Medical CenterDayton, TN
Industry payments (Open Payments)
- 2025$778.77 · 16 payments from 13 companies
- 2024$8,431 · 16 payments from 13 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Shockwave Medical, Inc | $195.80 | 1 |
| Heartflow, Inc. | $164.67 | 1 |
| Boston Scientific Corporation | $152.81 | 2 |
| Novartis Pharmaceuticals Corporation | $38.44 | 2 |
| Takeda Pharmaceuticals U.S.A., Inc. | $37.10 | 2 |
What the 2025 payments were for
- Food and Beverage$778.77 · 16 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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