Dr. Mark A. Harrison, MD
Cardiology (Cardiovascular Disease Physician)
- Medicare participating
At a glance
- Medical school
- Icahn School of Medicine at Mount Sinai (2005)
- Years since graduation
- 21
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 1,090
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
- 2005Medical school: Icahn School of Medicine at Mount Sinai
- 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
-
Cardiovascular Disease Physician primary
NY license 249392 -
Nuclear Cardiology Physician
NY license 249392
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Vassar Brothers Medical Center Poughkeepsie, NY
- Northern Dutchess Hospital Rhinebeck, NY
- Sharon Hospital Sharon, CT
Medical groups
- Hudson Valley Cardiovascular Practice PC (70 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
- 1,090
- Services billed
- 4,321
- Patients’ average age
- 76
| Service | Times | Patients |
|---|---|---|
| Established patient office or other outpatient visit, 30-39 minutes | 1,144 | 632 |
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | 763 | 552 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 486 | 206 |
| Blood test, clotting time | 362 | 155 |
| Anticoagulant management of patient taking warfarin | 340 | 152 |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 87 | 86 |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 73 | 73 |
| Hospital discharge day management, 30 minutes or less | 67 | 66 |
| Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician | 66 | 66 |
| Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician | 66 | 66 |
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, 7 companies reported 16 payments worth $574 in total to this clinician.
| E.r. Squibb & Sons, L.l.c. | $223 |
|---|---|
| Abbott Laboratories | $101 |
| Novartis Pharmaceuticals Corporation | $93.58 |
| Bridgebio Pharma, Inc. | $69.89 |
| Amgen Inc. | $42.54 |
| Pfizer Inc. | $22.12 |
| Boston Scientific Corporation | $21.54 |
| Food and Beverage | $574 |
|---|
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.