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ENDOCRINE CONSULTANTS OF LONG ISLAND LLP
NPI 1598061046
Internal Medicine - Endocrinology, Diabetes & Metabolism in Great Neck, NY

Active since February 01, 2011
29 BARSTOW ROAD, SUITE 305, GREAT NECK, NY 11021(516) 482-0347(516) 482-3267 Get Directions Write a Review

NPPES record last updated: April 28, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Endocrine Consultants Of Long Island Llp NPPES

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

ENDOCRINE CONSULTANTS OF LONG ISLAND LLP (NPI 1598061046) is a healthcare organization registered as an endocrinology, diabetes & metabolism in Great Neck, New York and active in the NPI registry since February 2011. The organization maintains a secondary practice location in Great Neck and lists Rory S Breidbart, Manager Partner, as its authorized official.

NPPES Registry Identity

NPI1598061046
Entity TypeOrganization
Primary Taxonomy207RE0101X
Legal Business NameENDOCRINE CONSULTANTS OF LONG ISLAND LLP
Location Address29 BARSTOW ROAD, SUITE 305Great Neck, NY 11021
Mailing Address29 Barstow Road, Suite 305Great Neck, NY 11021 · (516) 482-0347 · Fax (516) 482-3267
Phone(516) 482-0347
Fax(516) 482-3267
Organization SubpartNo
Authorized OfficialRory S BreidbartManager Partner · (516) 482-0347
Enumeration DateFebruary 1, 2011
Last NPPES UpdateApril 28, 2025
NPPES CertifiedApril 28, 2025
✔ NPI 1598061046 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians
Taxonomy Code207RE0101X
License✔ Licensed in NY · 175465
Definition
An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.
Also ListedInternal MedicineTaxonomy 207R00000X · License 1754665 (NY)
29 BARSTOW ROAD, Great Neck, NY 11021
Open in Google Maps ↗

Secondary Practice Location 1

Location 129 Barstow Road, Suite 305Great Neck, NY 11021 · Phone (516) 482-0347 · Fax (516) 482-3267

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 MULTIPLE 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)

Endocrine Consultants Of Long Island Llp is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

3

Medicare enrollment records show 3 clinicians reassign Medicare billing to Endocrine Consultants Of Long Island LLP, which bills Medicare for the services they deliver. Of these, 1 practice at this address and 3 within 10 miles. They are listed nearest first.

Clinicians, nearest first (3)

Rachel Fetner, M.D.
Endocrinology
NPI 1437184850
29 BARSTOW RD SUITE 305
Great Neck, NY 11021
(516) 482-0347
✔ PECOS✔ Accepts MedicareSame address
Fiona Williams, FNP-BC
Nurse Practitioner
NPI 1083352314
24102 NORTHERN BLVD
Douglaston, NY 11362
(718) 461-0163
✔ PECOS✔ Accepts Medicare2.1 mi
Rory Breidbart, MD
Endocrinology
NPI 1285600973
1999 MARCUS AVE STE 212
New Hyde Park, NY 11042
(516) 467-8600
✔ PECOS✔ Accepts Medicare2.9 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 Endocrine Consultants Of Long Island LLP's NPI number?

The NPI number for Endocrine Consultants Of Long Island LLP is 1598061046. It was assigned to this organization in the NPPES registry on February 1, 2011.

Where is Endocrine Consultants Of Long Island LLP located?

Endocrine Consultants Of Long Island LLP is located at 29 Barstow Road Suite 305, Great Neck, NY 11021. The listed phone number is (516) 482-0347.

What is Endocrine Consultants Of Long Island LLP's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

Is Endocrine Consultants Of Long Island LLP enrolled in Medicare?

Yes. Endocrine Consultants Of Long Island LLP is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Endocrine Consultants Of Long Island LLP?

According to the CMS Revalidation Reassignment List (October 2026 release), 3 clinicians reassign their Medicare billing to Endocrine Consultants Of Long Island LLP, in Endocrinology and Nurse Practitioner. 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. Of these, 1 practice at this address and 3 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 Endocrine Consultants Of Long Island LLP was last updated on April 28, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 months 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.