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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.

NEPHROLOGY ASSOCIATES OF MANHATTAN PC
NPI 1811978984
Specialist in New York, NY

Active since November 07, 2005
317 E 34TH ST, SECOND FLOOR, NEW YORK, NY 10016(212) 889-0770(212) 725-3538 Get Directions Write a Review

NPPES record last updated: September 19, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Nephrology Associates Of Manhattan Pc NPPES

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

NEPHROLOGY ASSOCIATES OF MANHATTAN PC (NPI 1811978984) is a healthcare organization registered as a specialist in New York, New York and active in the NPI registry since November 2005. The organization lists Miriam Sinitzky, Chief Operating Officer, as its authorized official.

NPPES Registry Identity

NPI1811978984
Entity TypeOrganization
Primary Taxonomy174400000X
Legal Business NameNEPHROLOGY ASSOCIATES OF MANHATTAN PC
Location Address317 E 34TH ST, SECOND FLOORNew York, NY 10016-4974
Mailing Address317 E 34th St, Second FloorNew York, NY 10016-4974 · (212) 889-0770 · Fax (212) 725-3538
Phone(212) 889-0770
Fax(212) 725-3538
Organization SubpartNo
Authorized OfficialMiriam SinitzkyChief Operating Officer · (212) 889-0770
Enumeration DateNovember 7, 2005
Last NPPES UpdateSeptember 19, 2026
NPPES CertifiedSeptember 19, 2026
✔ NPI 1811978984 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySpecialistOther Service Providers
Taxonomy Code174400000X
Definition
An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.
317 E 34TH ST, New York, NY 10016
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Other Identifiers 2

Medicaid00423845NY
Other05290410NY · Empire Blue Shield Id#

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Nephrology Associates Of Manhattan Pc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

6

Medicare enrollment records show 6 clinicians reassign Medicare billing to Nephrology Associates Of Manhattan PC, which bills Medicare for the services they deliver. Of these, 3 practice at this address and 6 within 10 miles. They are listed nearest first.

Clinicians, nearest first (6)

Albert Matalon, M.D.
Internal Medicine
NPI 1033174834
323 E 34TH ST FL 2
New York, NY 10016
(212) 263-7239
✔ PECOS✔ Accepts MedicareSame address
Daniel Matalon, MD
Nephrology
NPI 1972579530
323 E 34TH ST FL 2
New York, NY 10016
(212) 263-5654
✔ PECOS✔ Accepts MedicareSame address
Robert Matalon, M.D.
Internal Medicine
NPI 1730114463
323 E 34TH ST FL 2
New York, NY 10016
(212) 263-7239
✔ PECOS✔ Accepts MedicareSame address
Xenia Sumin, M.D.
Nephrology
NPI 1477795771
100 E 77TH ST
New York, NY 10075
(212) 434-2000
✔ PECOS✔ Accepts Medicare2.2 mi
Nai Yao, MD
Nephrology
NPI 1053326843
213 HESTER ST SECOND FLOOR
New York, NY 10013
(212) 889-0770
✔ PECOS✔ Accepts Medicare2.2 mi
Stephen Hofmeister, MD
Internal Medicine
NPI 1932115979
1111 AMSTERDAM AVE
New York, NY 10025
(212) 523-4000
✔ PECOS✔ Accepts Medicare4.3 mi

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

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 Nephrology Associates Of Manhattan PC's NPI number?

The NPI number for Nephrology Associates Of Manhattan PC is 1811978984. It was assigned to this organization in the NPPES registry on November 7, 2005.

Where is Nephrology Associates Of Manhattan PC located?

Nephrology Associates Of Manhattan PC is located at 317 E 34th St Second Floor, New York, NY 10016. The listed phone number is (212) 889-0770.

What is Nephrology Associates Of Manhattan PC's specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

Is Nephrology Associates Of Manhattan PC enrolled in Medicare?

Yes. Nephrology Associates Of Manhattan PC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Nephrology Associates Of Manhattan PC?

According to the CMS Revalidation Reassignment List (October 2026 release), 6 clinicians in 2 Medicare specialties reassign their Medicare billing to Nephrology Associates Of Manhattan PC. A 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 the clinician's services. The largest specialties are Internal Medicine (3) and Nephrology (3). Of these, 3 practice at this address and 6 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Nephrology Associates Of Manhattan PC was last updated on September 19, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 48 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.