Dr. Michael S. Charles, MD
General Surgery (Surgical Critical Care Physician)
- Medicare participating
At a glance
- Years since graduation
- 41
- In the NPI registry since
- 2005
- Medicare patients seen, 2024
- 339
Licensed in Texas since 1989, according to the Texas Medical Board. We show license dates only for the states that publish them in bulk; see which states do. For other states, check the state medical board.
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. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is
Education and training
- 2005Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier
Medicare’s Care Compare data doesn’t list this clinician’s medical school. 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 28445 -
Surgery Physician
TX license H5534 (first issued 1989; active)
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Ascension St John Medical Center Tulsa, OK
- Ascension St John Jane Phillips Bartlesville, OK
- Ascension St John Broken Arrow Broken Arrow, OK
- St John Owasso Owasso, OK
- Ascension St John Sapulpa Sapulpa, OK
Medical groups
- St. John Physicians, Inc. (259 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
- 339
- Services billed
- 852
- Patients’ average age
- 77
| Service | Times | Patients |
|---|---|---|
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 235 | 147 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 180 | 127 |
| Critical care, first 30-74 minutes | 179 | 76 |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 134 | 134 |
| Hospital discharge day management, 30 minutes or less | 117 | 117 |
| Critical care, each additional 30 minutes | 103 | 33 |
| Limited ultrasound scan of abdomen | 24 | 24 |
| Ultrasound of heart, follow-up | 22 | 22 |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 18 | 17 |
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 | 26 |
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, 3 companies reported 3 payments worth $306 in total to this clinician.
| Medtronic, Inc. | $167 |
|---|---|
| Clr Medical, Inc. | $75.00 |
| Intuitive Surgical, Inc. | $64.78 |
| Food and Beverage | $306 |
|---|
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.
Industry-funded research
Named as a principal investigator on 2 industry-funded studies in 2025, from 2 companies. The companies reported $29,978 in research payments for these studies, mostly to the institutions running them.
- A study of TAK-330 for reversal of direct oral factor xa inhibitor-induced anticoagulation
Takeda Pharmaceuticals U.S.A., Inc. - Evaluation of BE1116 in Patients With Traumatic Injury and Acute Major Bleeding to Improve Survival ( TAP Study )
Csl Behring · Terminated · NCT05568888
From CMS Open Payments research payments, where companies name up to five principal investigators per payment. Research payments usually go to hospitals, universities and research sites, not to the investigator personally. A payment is not evidence of wrongdoing.