John C. Showalter, MD
NPI 1104862002ActiveIndividual· Internal Medicine· Knoxville, TN
Internal Medicine (MD) in Knoxville, Tennessee, trained at University of Kansas School of Med (Kc/Wich/Sal) (class of 1997). Their prescriptions cost Medicare Part D more than their services did: $1,415,607 for 15,625 claims, against $264,337 paid for services in 2024. Novo Nordisk Inc was the largest of 16 companies reporting payments in 2025, $1,162 in all, mostly food and beverage.
Overview
| NPI | 1104862002 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 21, 2006 |
| Last updated in NPPES | Jun 3, 2010 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 34349 | TN |
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 - Internal Medicine (TN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 531 |
|---|---|
| Services billed | 14,475 across 153 procedure codes |
| Paid by Medicare | $264,337 |
Part D prescriptions in 2024
| Prescriptions (claims) | 15,625 · 36,896 30-day fills |
|---|---|
| Patients | 913 |
| Total drug cost | $1,415,607 |
| Generic share | 88% of claims |
Education and affiliations
| Medical school | University of Kansas School of Med (Kc/Wich/Sal) |
|---|---|
| Graduation year | 1997 |
| Medicare specialty | Internal Medicine |
Medical groups
- Physiotherapy Associates IncMemphis, TN · 1,460 clinicians
- Summit Medical Group, PLLCKnoxville, TN · 652 clinicians
Hospital affiliations
- Fort Sanders Regional Medical CenterKnoxville, TN
- Methodist Medical Center of Oak RidgeOak Ridge, TN
- Parkwest Medical CenterKnoxville, TN
- Physicians Regional Medical CenterPowell, TN
- University Health System, IncKnoxville, TN
Other facilities
- Amedisys Home Health CareHome health agency · Knoxville, TN
- Covenant HomecareHome health agency · Knoxville, TN
- University of Tn Medical Center Home Care ServicesHome health agency · Knoxville, TN
Industry payments (Open Payments)
- 2025$1,162 · 86 payments from 16 companies
- 2024$1,407 · 104 payments from 19 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $239.95 | 19 |
| Abbvie Inc. | $196.09 | 17 |
| Pfizer Inc. | $141.82 | 11 |
| Amgen Inc. | $139.11 | 14 |
| Edwards Lifesciences Corporation | $82.69 | 4 |
What the 2025 payments were for
- Food and Beverage$1,162 · 86 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 287 internal medicine physicians in Knoxville · All internal medicine physicians in Tennessee