Jon Mark Johnson Sr., M.D.
NPI 1598765497ActiveIndividual· Internal Medicine· Stillwater, OK
Internal Medicine (M.D.) in Stillwater, Oklahoma, trained at University of Oklahoma College of Medicine (class of 1984). Their prescriptions cost Medicare Part D more than their services did: $557,274 for 7,589 claims, against $239,409 paid for services in 2024. Amgen Inc. was the largest of 5 companies reporting payments in 2025, $282.98 in all, mostly food and beverage.
Overview
| NPI | 1598765497 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 21, 2005 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 15120 | OK |
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 (OK) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 746 |
|---|---|
| Services billed | 3,652 across 55 procedure codes |
| Paid by Medicare | $239,409 |
Part D prescriptions in 2024
| Prescriptions (claims) | 7,589 · 16,856 30-day fills |
|---|---|
| Patients | 552 |
| Total drug cost | $557,274 |
| Generic share | 90% of claims |
Education and affiliations
| Medical school | University of Oklahoma College of Medicine |
|---|---|
| Graduation year | 1984 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Select Physical Therapy Holdings IncClarksville, TN · 2,024 clinicians
- Stillwater Medical Center AuthorityStillwater, OK · 153 clinicians
Hospital affiliations
- Integris Baptist Medical Center, IncOklahoma City, OK
- O U Medical CenterOklahoma City, OK
- Stillwater Medical - PerryPerry, OK
- Stillwater Medical CenterStillwater, OK
- Stillwater Medical-BlackwellBlackwell, OK
Other facilities
- Companion Home Health, LLCHome health agency · Guthrie, OK
- Complete Home Health of Western OklahomaHome health agency · Tulsa, OK
- Elara Caring XviiiHome health agency · Stillwater, OK
- Stillwater Medical at HomeHome health agency · Stillwater, OK
Industry payments (Open Payments)
- 2025$282.98 · 11 payments from 5 companies
- 2024$175.03 · 11 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $163.11 | 4 |
| Lilly USA, LLC | $60.31 | 4 |
| Abbott Laboratories | $22.31 | 1 |
| Medtronic, Inc. | $20.03 | 1 |
| Viatris Specialty LLC | $17.22 | 1 |
What the 2025 payments were for
- Food and Beverage$282.98 · 11 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 33 internal medicine physicians in Stillwater · All internal medicine physicians in Oklahoma