Ellen C. Tan, DO
Student in an Organized Health Care Education/Training Program
- Medicare participating
At a glance
- In the NPI registry since
- 2020
- Medicare patients seen, 2024
- 15
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
- 2020Registered 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
-
Student in an Organized Health Care Education/Training Program primary
PA license OT022267 -
Internal Medicine Physician
OH license 34.016562
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Medicare patients and services
- Medicare patients, 2024
- 15
- Services billed
- 33
- Patients’ average age
- 68
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, 8 companies reported 16 payments worth $422 in total to this clinician.
| Janssen Biotech, Inc. | $169 |
|---|---|
| Abiomed | $89.58 |
| Ardelyx, Inc. | $63.53 |
| Takeda Pharmaceuticals U.S.A., Inc. | $30.89 |
| AbbVie Inc. | $22.64 |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $21.16 |
| Intercept Pharmaceuticals, Inc. | $18.67 |
| Organon LLC | $6.17 |
| Food and Beverage | $338 |
|---|---|
| Education | $84.00 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| Janssen Biotech, Inc. Jul 7, 2025 | Education TREMFYA · Immunology · in-kind | $84.00 |
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.