Quick answers
- Which hospitals does Mark E. Lieb work at?
- Medicare's official clinician data lists Mark E. Lieb at 1 hospital: Northern Westchester Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark E. Lieb see patients?
- Medicare's clinician data lists 2 practice locations, including Mount Kisco, NY. Call before your visit to confirm the address.
- What is Mark E. Lieb's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty.
- Does Mark E. Lieb accept Medicare assignment?
- Yes. Medicare's clinician data says Mark E. Lieb 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.
- Does Mark E. Lieb offer telehealth?
- Medicare's clinician data says Mark E. Lieb offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Mark E. Lieb?
- (914) 241-1050, as listed in official Medicare / NPI Registry data.
- What is Mark E. Lieb's NPI number?
- 1619921749. 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 E. Lieb works
Medicare's Facility Affiliation Data lists Mark E. Lieb at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Northern Westchester HospitalMount Kisco, NY · Acute Care Hospital · CCN 330162
Practice locations
Addresses where Mark E. Lieb is enrolled with Medicare (CMS data updated 2026-10-02).
- 400 E Main St, Suite 761Mount Kisco, NY 10549 (914) 241‑1050
- 90 S Bedford RdMount Kisco, NY 10549 (914) 241‑1050
Group practices
Medicare enrollment lists Mark E. Lieb as a member of this group (CMS data updated 2026-10-02).
- Optum Medical Care PC1,010 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in New York →
Other cardiologists in Mount Kisco
Clinicians with the same Medicare primary specialty in Mount Kisco, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Boston University School Of Medicine |
| Graduation year | 1988 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1619921749 |
| 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