Dr. John E. Markantonis, DO
Pathology (Anatomic Pathology & Clinical Pathology Physician)
- Medicare participating
At a glance
- Years since graduation
- 9
- In the NPI registry since
- 2017
- Medicare patients seen, 2024
- 71
Licensed in Texas since 2021, 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. What an NPI is
Education and training
- 2017Registered with an NPI (national billing number; not a license date)
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
-
Anatomic Pathology & Clinical Pathology Physician primary
NC license 2022-03036 -
Clinical Pathology Physician
NC license 2022-03036 -
General Practice Physician
TX license T4423 (first issued 2021; active) -
Medical Microbiology Physician
NC license 2022-03036
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- NYU Langone Hospitals New York, NY
- Ecu Health Medical Center Greenville, NC
- Vidant Chowan Hospital Edenton, NC
- Ecu Health North Hospital Roanoke Rapids, NC
- Vidant Roanoke Chowan Hospital Ahoskie, NC
Medical groups
- New York University (6,134 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
- 71
- Services billed
- 107
- Patients’ average age
- 75
| Service | Times | Patients |
|---|---|---|
| Pathology clinical consultation for clinical problem, 5-20 minutes | 38 | 35 |
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.
Payments from drug and device companies
In 2025, 5 companies reported 7 payments worth $847 in total to this clinician.
| Biomerieux Inc | $423 |
|---|---|
| Merck Sharp & Dohme LLC | $151 |
| La Jolla Pharmaceutical Company | $128 |
| AbbVie Inc. | $125 |
| Shionogi Inc | $19.88 |
| Food and Beverage | $821 |
|---|---|
| Education | $25.70 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| Merck Sharp & Dohme LLC Jun 10, 2025 | Education ZERBAXA · INFECTIOUS DISEASE · in-kind | $25.70 |
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.