Quick answers
- Where does Mark G. Borek see patients?
- Medicare's clinician data lists 2 practice locations, including Smithtown, NY and Port Jefferson Station, NY. Call before your visit to confirm the address.
- What is Mark G. Borek's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty.
- Does Mark G. Borek accept Medicare assignment?
- Yes. Medicare's clinician data says Mark G. Borek 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 G. Borek?
- (631) 979-8880, as listed in official Medicare / NPI Registry data.
- What is Mark G. Borek's NPI number?
- 1922012707. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Mark G. Borek is enrolled with Medicare (CMS data updated 2026-10-02).
- 496 Smithtown Byp, Suite 101Smithtown, NY 11787 (631) 979‑8880
- 5225 Rte, 347 Suite 23Port Jefferson Station, NY 11776 (631) 473‑8880
Group practices
Medicare enrollment lists Mark G. Borek as a member of this group (CMS data updated 2026-10-02).
- Millennium Medical Professionals, PLLC5 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in New York →
Other cardiologists in Smithtown
Clinicians with the same Medicare primary specialty in Smithtown, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | State University Of New York Downstate Medical Center |
| Graduation year | 1981 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1922012707 |
| 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
- 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