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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. GREGORY TADEUSZ MARECKI M.D.
NPI 1881129856
Internal Medicine - Advanced Heart Failure and Transplant Cardiology in Flushing, NY

Active since April 26, 2017PECOS Enrolled
5645 MAIN ST, FLUSHING, NY 11355(347) 480-1200 Get Directions Write a Review

NPPES record last updated: October 12, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Oct 12, 2026, Aug 18, 2026, Jul 29, 2026 and 2 more (5 updates tracked since 2017).

About Dr. Gregory Tadeusz Marecki M.d. NPPES

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

DR. GREGORY TADEUSZ MARECKI M.D. (NPI 1881129856) is an individual advanced heart failure and transplant cardiology provider in Flushing, New York, licensed in New York (304273) and active in the NPI registry since April 2017. He is enrolled in Medicare PECOS and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1881129856
Entity TypeIndividualMale
Primary Taxonomy207RA0001X
Provider Legal NameDR. GREGORY TADEUSZ MARECKICredential: M.D.
Location Address5645 MAIN STFlushing, NY 11355-5045
Mailing Address550 1st AveNew York, NY 10016-6402 · (212) 263-5506
Phone(347) 480-1200
Sole ProprietorNo
Enumeration DateApril 26, 2017
Last NPPES UpdateOctober 12, 20265 updates tracked since enumeration
NPPES CertifiedOctober 12, 2026
✔ NPI 1881129856 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Advanced Heart Failure and Transplant CardiologyAllopathic & Osteopathic Physicians
Taxonomy Code207RA0001X
License✔ Licensed in NY · 304273
Definition
Specialists in Advanced Heart Failure and Transplant Cardiology would participate in the inpatient and outpatient management of patients with advanced heart failure across the spectrum from consideration for high-risk cardiac surgery, cardiac transplantation, or mechanical circulatory support, to pre-and post-operative evaluation and management of patients with cardiac transplants and mechanical support devices, and end-of-life care for patients with end-stage heart failure.
Also ListedHospitalistTaxonomy 208M00000X · License 304273 (NY)
5645 MAIN ST, Flushing, NY 11355
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Secondary Practice Locations 2

Location 118603 Union TpkeFlushing, NY 11366-1733 · Phone (718) 670-1837
Location 2550 1st AveNew York, NY 10016-6402 · Phone (212) 263-5506

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Gregory Tadeusz Marecki M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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

2

Medicare enrollment records show Gregory Marecki reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Weill Medical College Of Cornell
6.8 mi
Advanced Heart Failure and Transplant Cardiology
520 E 70TH ST, STARR 4
New York, NY 10021
  • Reassigned Medicare billing, New York enrollment
  • 28 clinicians in this Medicare group
NPI 1124333182 (212) 746-2150
New York University
1,042 mi
Cardiovascular Disease
3301 QUANTUM BLVD
Boynton Beach, FL 33426
  • Reassigned Medicare billing, New York enrollment
  • 7,712 clinicians in this Medicare group
NPI 1285826438 (877) 648-2964

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 11355 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
$153.13 typical visit price
range $67.00 – $201.98
Typical copayment $38.28 (range $16.75 – $50.49)
Most-billed visit code 99204
Established Patient
$116.96 typical visit price
range $21.62 – $163.52
Typical copayment $29.24 (range $5.40 – $40.88)
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.

Other Providers at the Same Location NPPES 20

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

ANA M GHELECHKHANI PA
Physician Assistant (Medical)
5645 MAIN ST
FLUSHING, NY 11355
Queens County (718) 670-2608
PEDRO XAVIER PALACIOS PA-C
Physician Assistant (Medical)
5645 MAIN ST
FLUSHING, NY 11355
Queens County (718) 670-1000
DR. OSCAR ROLDAN
Anesthesiology
5645 MAIN ST
FLUSHING, NY 11355
Queens County (646) 962-9930
ALEXIS TORRES RODRIGUEZ
Internal Medicine (Infectious Disease)
5645 MAIN ST
FLUSHING, NY 11355
Queens County (718) 670-1507
DR. BRENT HOCHSTEIN DO
Student in an Organized Health Care Education/Training Program
5645 MAIN ST
FLUSHING, NY 11355
Queens County (718) 670-2000
DR. PRINCIE NANDINI ROY MD
Student in an Organized Health Care Education/Training Program
5645 MAIN ST
FLUSHING, NY 11355
Queens County (718) 670-2000
ERIC CHROSTOWSKI
Student in an Organized Health Care Education/Training Program
5645 MAIN ST
FLUSHING, NY 11355
Queens County (718) 670-2000
PETER JAESUNG JO
Nurse Practitioner (Family)
5645 MAIN ST
FLUSHING, NY 11355
Queens County (917) 340-4637

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 Gregory Marecki's NPI number?

The NPI number for Gregory Marecki is 1881129856. It was assigned to this individual provider in the NPPES registry on April 26, 2017.

Where is Gregory Marecki located?

Gregory Marecki practices at 5645 Main St, Flushing, NY 11355. The listed phone number is (347) 480-1200.

What is Gregory Marecki's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Advanced Heart Failure and Transplant Cardiology, with taxonomy code 207RA0001X.

Is Gregory Marecki enrolled in Medicare?

Yes. Gregory Marecki is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Gregory Marecki's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Marecki reassigns Medicare benefits to 2 organizations: Weill Medical College Of Cornell (New York, NY) and New York University (Boynton Beach, FL). 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 Gregory Marecki's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Gregory Marecki was last updated on October 12, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 28 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.