Quick answers
- Which hospitals does Mark A. Harrison work at?
- Medicare's official clinician data lists Mark A. Harrison at 3 hospitals: Northern Dutchess Hospital, Sharon Hospital and Vassar Brothers Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark A. Harrison see patients?
- Medicare's clinician data lists 5 practice locations, including Poughkeepsie, NY, Kingston, NY and Fishkill, NY. Call before your visit to confirm the address.
- What is Mark A. Harrison's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty, and also Internal Medicine.
- Does Mark A. Harrison accept Medicare assignment?
- Yes. Medicare's clinician data says Mark A. Harrison accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Mark A. Harrison?
- (845) 339-8700, as listed in official Medicare / NPI Registry data.
- What is Mark A. Harrison's NPI number?
- 1285799585. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark A. Harrison works
Medicare's Facility Affiliation Data lists Mark A. Harrison at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Northern Dutchess HospitalRhinebeck, NY · Acute Care Hospital · CCN 330049
- Sharon HospitalSharon, CT · Acute Care Hospital · CCN 070004
- Vassar Brothers Medical CenterPoughkeepsie, NY · Acute Care Hospital · CCN 330023
Practice locations
Addresses where Mark A. Harrison is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Columbia StPoughkeepsie, NY 12601
- 33 Grand St, Suite 55Kingston, NY 12401 (845) 339‑8700
- 60 Merritt Blvd, Suite 200Fishkill, NY 12524 (845) 897‑9760
- 6511 Spring Brook Ave, Suite 1006Rhinebeck, NY 12572 (845) 473‑1188
- 939 Little Britain RdNew Windsor, NY 12553 (845) 567‑1800
Group practices
Medicare enrollment lists Mark A. Harrison as a member of this group (CMS data updated 2026-10-02).
- Hudson Valley Cardiovascular Practice PC70 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in New York →
Other cardiologists in Poughkeepsie
Clinicians with the same Medicare primary specialty in Poughkeepsie, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Icahn School Of Medicine At Mount Sinai |
| Graduation year | 2005 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1285799585 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians