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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. MARK N. SAYEGH MD
NPI 1700374360
Internal Medicine - Infectious Disease in Scarsdale, NY

Active since April 28, 2018PECOS Enrolled
100/100
CMS Quality Rating
340 ARDSLEY RD STE 2A, SCARSDALE, NY 10583(914) 222-1486(914) 222-8761 Get Directions Write a Review

NPPES record last updated: October 1, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Oct 1, 2026, Nov 11, 2024, Jul 12, 2021 and 1 more (4 updates tracked since 2018).

About Dr. Mark N. Sayegh Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARK N. SAYEGH MD (NPI 1700374360) is an individual infectious disease provider in Scarsdale, New York, licensed in New York (311603) and active in the NPI registry since April 2018. He is enrolled in Medicare PECOS, is affiliated with St John's Riverside Hospital, and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1700374360
Entity TypeIndividualMale
Primary Taxonomy207RI0200X
Provider Legal NameDR. MARK N. SAYEGHCredential: MD
Location Address340 ARDSLEY RD STE 2AScarsdale, NY 10583-2456
Mailing Address340 Ardsley Rd Ste 2aScarsdale, NY 10583-2456 · (914) 222-1486 · Fax (914) 222-8761
Phone(914) 222-1486
Fax(914) 222-8761
Sole ProprietorNo
Medical School CMSOtherGraduated 2018
Enumeration DateApril 28, 2018
Last NPPES UpdateOctober 1, 20264 updates tracked since enumeration
NPPES CertifiedOctober 1, 2026
✔ NPI 1700374360 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Infectious DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RI0200X
License✔ Licensed in NY · 311603
Definition
An internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients with fevers which have not been explained. Infectious disease specialists may also have expertise in preventive medicine and travel medicine.
340 ARDSLEY RD STE 2A, Scarsdale, NY 10583
Open in Google Maps ↗

Secondary Practice Locations 2

Location 1967 N BroadwayYonkers, NY 10701-1301 · Phone (914) 693-0700
Location 2128 Ashford AveDobbs Ferry, NY 10522-1924 · Phone (914) 693-0700

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Mark N. Sayegh Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID6103160643
PECOS Enrollment IDI20210810003477
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

3

Medicare enrollment records show Mark Sayegh reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

New York Infectious Disease & Public Health Medicine, P.C.
Same address
Infectious Disease
340 ARDSLEY RD STE 2A
Scarsdale, NY 10583
  • Reassigned Medicare billing, New York enrollment
NPI 1013852219 (914) 222-1486
Symphony Medical PC
2.5 mi
Orthopaedic Surgery
128 ASHFORD AVE
Dobbs Ferry, NY 10522
  • Reassigned Medicare billing, New York enrollment
  • 130 clinicians in this Medicare group
NPI 1023600327 (914) 559-1022
Westchester Medical Center Advanced Physician Services PC
6.5 mi
Anesthesiology
100 WOODS RD, TAYLOR PAVILION - ROOM M229
Valhalla, NY 10595
  • Reassigned Medicare billing, New York enrollment
  • 1,663 clinicians in this Medicare group
NPI 1740687458 (914) 493-2844

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
23 services23 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

St John's Riverside Hospital

Acute Care Hospitals · Yonkers, NY
1/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number330208
Location976 North BroadwayYonkers, NY 10701 · Westchester County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 10583 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$154.28 typical visit price
range $67.40 – $203.53
Typical copayment $38.57 (range $16.85 – $50.88)
Most-billed visit code 99204
Established Patient
$117.62 typical visit price
range $21.66 – $164.45
Typical copayment $29.40 (range $5.41 – $41.11)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

100/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality91.98
Improvement Activities40

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

NEW YORK INFECTIOUS DISEASE & PUBLIC HEALTH MEDICINE, P.C.
Internal Medicine (Infectious Disease)
340 ARDSLEY RD STE 2A
SCARSDALE, NY 10583
Westchester County (914) 222-1486

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mark Sayegh's NPI number?

The NPI number for Mark Sayegh is 1700374360. It was assigned to this individual provider in the NPPES registry on April 28, 2018.

Where is Mark Sayegh located?

Mark Sayegh practices at 340 Ardsley Rd Ste 2A, Scarsdale, NY 10583. The listed phone number is (914) 222-1486.

What is Mark Sayegh's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.

Is Mark Sayegh enrolled in Medicare?

Yes. Mark Sayegh is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Mark Sayegh's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mark Sayegh reassigns Medicare benefits to 3 organizations: New York Infectious Disease & Public Health Medicine, P.C. (Scarsdale, NY), Symphony Medical PC (Dobbs Ferry, NY) and Westchester Medical Center Advanced Physician Services PC (Valhalla, NY). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mark Sayegh's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Mark Sayegh affiliated with any hospitals?

According to CMS data, Mark Sayegh is affiliated with St John's Riverside Hospital.

When was this NPI record last updated?

The NPPES record for Mark Sayegh was last updated on October 1, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.