Dr. John Marc Shellenberger, MD
General Surgery (Surgical Critical Care Physician)
- Medicare participating
At a glance
- Medical school
- University of Arkansas College of Medicine (2013)
- Years since graduation
- 13
- In the NPI registry since
- 2013
- Medicare patients seen, 2024
- 281
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. What an NPI is
Education and training
- 2013Medical school: University of Arkansas College of Medicine
- 2013Registered with an NPI (national billing number; not a license date)
Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Surgical Critical Care Physician primary
OK license 34961 -
Surgery Physician
MO license 2013022036
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Saint Francis Hospital, Inc Tulsa, OK
- Saint Francis Hospital South, LLC Tulsa, OK
- Saint Francis Hospital Muskogee Muskogee, OK
- Stillwater Medical Center Stillwater, OK
- Mcalester Regional Health Center Mcalester, OK
Medical groups
- Warren Clinic Inc (883 clinicians)
- Care Communications LLC (33 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 281
- Services billed
- 517
- Patients’ average age
- 75
| Service | Times | Patients |
|---|---|---|
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 181 | 89 |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 89 | 88 |
| Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 58 | 41 |
| Critical care, first 30-74 minutes | 39 | 13 |
| Hospital discharge day management, 30 minutes or less | 33 | 33 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 26 | 15 |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 25 | 25 |
| Removal of gallbladder using an endoscope | 11 | 11 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Oxycodone Hcl Other prescribers in Tulsa, OK | 19 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 5 companies reported 9 payments worth $453 in total to this clinician.
| Becton, Dickinson and Company | $170 |
|---|---|
| Intuitive Surgical, Inc. | $144 |
| DePuy Synthes Sales Inc. | $73.40 |
| Aroa Biosurgery Incorporated | $37.87 |
| Ethicon US, LLC | $27.16 |
| Food and Beverage | $434 |
|---|---|
| Travel and Lodging | $19.00 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| Intuitive Surgical, Inc. Oct 30, 2025 | Travel and Lodging Da Vinci Surgical System · SURGERY · travel to AUSTIN, TX · in-kind | $19.00 |
Each payment as the company reported it, with the products it named. Meals are counted in the totals above but not listed one by one.
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.