Dr. Thomas D. Eisen, MD
Nephrology (Kidney) (Nephrology Physician)
- Medicare participating
At a glance
- Medical school
- New York University Medical College - Nlg (1983)
- Years since graduation
- 43
- In the NPI registry since
- 2005
- Medicare patients seen, 2024
- 237
Licensed in Connecticut since 1987, according to the Connecticut Department of Public Health. 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
- 1983Medical school: New York University Medical College - Nlg
- 2005Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier
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
-
Nephrology Physician primary
CT license 28182 (first issued 1987; active)
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Yale-New Haven Hospital New Haven, CT
- Bridgeport Hospital Bridgeport, CT
Medical groups
- Metabolism Associates PC (9 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
- 237
- Services billed
- 5,985
- Patients’ average age
- 71
| Service | Times | Patients |
|---|---|---|
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 259 | 111 |
| Hemodialysis procedure with physician evaluation | 182 | 60 |
| Established patient office or other outpatient visit, 30-39 minutes | 155 | 79 |
| Dialysis services, 4 or more physician visits per month (20 years or older) | 77 | 17 |
| Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes | 58 | 53 |
| Dialysis services, 2-3 physician visits per month (20 years or older) | 28 | 14 |
| Established patient office or other outpatient visit, 20-29 minutes | 22 | 15 |
| New patient office or other outpatient visit, 45-59 minutes | 19 | 19 |
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
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, 21 companies reported 77 payments worth $1,751 in total to this clinician.
| Novo Nordisk Inc | $212 |
|---|---|
| Boehringer Ingelheim Pharmaceuticals, Inc. | $188 |
| Akebia Therapeutics Inc | $167 |
| Travere Therapeutics, Inc. | $163 |
| Amgen Inc. | $149 |
| Calliditas Therapeutics US Inc. | $127 |
| Mallinckrodt Hospital Products Inc. | $97.50 |
| AstraZeneca Pharmaceuticals LP | $94.39 |
| Food and Beverage | $1,745 |
|---|---|
| Education | $6.09 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| Travere Therapeutics, Inc. Oct 9, 2025 | Education Filspari · Kidney Disease · in-kind | $2.38 |
| Travere Therapeutics, Inc. Sep 22, 2025 | Education Filspari · Kidney Disease · in-kind | $1.66 |
| Travere Therapeutics, Inc. Oct 9, 2025 | Education Filspari · Kidney Disease · in-kind | $1.66 |
| Travere Therapeutics, Inc. Nov 7, 2025 | Education Filspari · Kidney Disease · in-kind | $0.39 |
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.