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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. GRZEGORZ WALCZAK MD
NPI 1801522511
Pathology - Anatomic Pathology & Clinical Pathology in New York, NY

Active since July 26, 2022
1275 YORK AVE, NEW YORK, NY 10065(212) 639-7456 Get Directions Write a Review

NPPES record last updated: September 21, 2026. Verified against the NPPES registry weekly; last sync: September 27, 2026.

Record update history: Sep 21, 2026, Aug 22, 2023, Jul 21, 2023 and 2 more (5 updates tracked since 2022).

About Dr. Grzegorz Walczak Md NPPES

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

DR. GRZEGORZ WALCZAK MD (NPI 1801522511) is an individual anatomic pathology & clinical pathology provider in New York, New York, licensed in New York (340270-01) and active in the NPI registry since July 2022.

NPPES Registry Identity

NPI1801522511
Entity TypeIndividualMale
Primary Taxonomy207ZP0102X
Provider Legal NameDR. GRZEGORZ WALCZAKCredential: MD
Location Address1275 YORK AVENew York, NY 10065-6007
Mailing Address1275 York AveNew York, NY 10065-6007 · (401) 243-4834
Phone(212) 639-7456
Sole ProprietorYes
Enumeration DateJuly 26, 2022
Last NPPES UpdateSeptember 21, 20265 updates tracked since enumeration
NPPES CertifiedSeptember 21, 2026
✔ NPI 1801522511 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPathology · Anatomic Pathology & Clinical PathologyAllopathic & Osteopathic Physicians
Taxonomy Code207ZP0102X
License✔ Licensed in NY · 340270-01
Definition
A pathologist deals with the causes and nature of disease and contributes to diagnosis, prognosis and treatment through knowledge gained by the laboratory application of the biologic, chemical and physical sciences. A pathologist uses information gathered from the microscopic examination of tissue specimens, cells and body fluids, and from clinical laboratory tests on body fluids and secretions for the diagnosis, exclusion and monitoring of disease.
1275 YORK AVE, New York, NY 10065
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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.

MRS. ZANA CORREA NP
Nurse Practitioner (Adult Health)
1275 YORK AVE
NEW YORK, NY 10065
New York County (646) 422-4450
MS. NICOLE NOELLE REYNOLDS NP
Nurse Practitioner (Acute Care)
1275 YORK AVE
NEW YORK, NY 10065
New York County (212) 682-7326
MRS. SHARLENE SEECHARRAN RN, NP
Nurse Practitioner (Adult Health)
1275 YORK AVE
NEW YORK, NY 10065
New York County (212) 639-2203
CHRISTINA MADINABEITIA DURNEY
Nurse Practitioner (Pediatrics)
1275 YORK AVE
NEW YORK, NY 10065
New York County (212) 639-5164
ALISON GAIL MASSEY ANP
Nurse Practitioner (Adult Health)
1275 YORK AVE
NEW YORK, NY 10065
New York County (212) 639-2000
MICHAEL SCORDO
Internal Medicine (Hematology & Oncology)
1275 YORK AVE
NEW YORK, NY 10065
New York County (212) 639-2000
AMPARO G CAMACHO NP
Nurse Practitioner (Adult Health)
1275 YORK AVE
NEW YORK, NY 10065
New York County (646) 422-4417
DR. INES NIKOLOVSKI MBBS
Special Hospital
1275 YORK AVE, MEMORIAL SLOAN KETTERING CANCER CENTRE
NEW YORK, NY 10065
New York County (212) 639-2000

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 Grzegorz Walczak's NPI number?

The NPI number for Grzegorz Walczak is 1801522511. It was assigned to this individual provider in the NPPES registry on July 26, 2022.

Where is Grzegorz Walczak located?

Grzegorz Walczak practices at 1275 York Ave, New York, NY 10065. The listed phone number is (212) 639-7456.

What is Grzegorz Walczak's specialty?

The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.

When was this NPI record last updated?

The NPPES record for Grzegorz Walczak was last updated on September 21, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.