Dr. Jay I. Stack, M.D.
Nephrology (Kidney) (Nephrology Physician)
- Medicare participating
At a glance
- Medical school
- Perelman School of Med at the University of Pennsylvania (1976)
- Years since graduation
- 50
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 241
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
- 1976Medical school: Perelman School of Med at the University of Pennsylvania
- 2006Registered 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
NJ license 25MA03875700
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Morristown Medical Center Morristown, NJ
Medical groups
- Northeast Kidney Care LLC (67 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
- 241
- Services billed
- 1,205
- Patients’ average age
- 75
| Service | Times | Patients |
|---|---|---|
| Dialysis services, 4 or more physician visits per month (20 years or older) | 335 | 34 |
| Established patient office or other outpatient visit, 30-39 minutes | 263 | 140 |
| Established patient office or other outpatient visit, 40-54 minutes | 50 | 28 |
| New patient office or other outpatient visit, 60-74 minutes | 44 | 44 |
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, 8 companies reported 17 payments worth $702 in total to this clinician.
| Alexion Pharmaceuticals, Inc. | $350 |
|---|---|
| Ardelyx, Inc. | $113 |
| Otsuka America Pharmaceutical, Inc. | $62.02 |
| Novartis Pharmaceuticals Corporation | $60.87 |
| AstraZeneca Pharmaceuticals LP | $47.15 |
| Travere Therapeutics, Inc. | $32.76 |
| Amgen Inc. | $18.95 |
| Cormedix Inc. | $16.66 |
| Consulting Fee | $350 |
|---|---|
| Food and Beverage | $348 |
| Education | $3.32 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| Alexion Pharmaceuticals, Inc. Sep 5, 2025 | Consulting Fee ULTOMIRIS · Rare Disease | $350 |
| Travere Therapeutics, Inc. Sep 26, 2025 | Education Filspari · Kidney Disease · in-kind | $3.32 |
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.