SAGAPONACK MEDICAL PC
NPI 1407351646
Clinic/Center - Medical Specialty in Sag Harbor, NY

Q: What is Sagaponack Medical PC's NPI number?

The NPI number for Sagaponack Medical PC is 1407351646. It was assigned to this organization in the NPPES registry on March 29, 2018. The provider is doing business as Halsey Dermatology and Sag Harbor Dermatology.

Q: What is Sagaponack Medical PC's specialty?

The primary specialty registered for this NPI is Clinic/Center, specializing in Medical Specialty, with taxonomy code 261QM2500X.

Active since March 29, 2018

3350 NOYAC RD, SAG HARBOR, NY 11963(631) 731-1099 Get Directions Write a Review

NPPES record last updated: July 8, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jul 8, 2026, Aug 7, 2025, Aug 2, 2019 and 3 more (6 updates tracked since 2018).

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About Sagaponack Medical Pc NPPES

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

SAGAPONACK MEDICAL PC (NPI 1407351646), doing business as Halsey Dermatology, is a healthcare organization registered as a medical specialty in Sag Harbor, New York and active in the NPI registry since March 2018. The organization maintains a secondary practice location in Sag Harbor and lists Mark A. Halsey, President, as its authorized official.

NPPES Registry Identity

NPI1407351646

Entity TypeOrganization

Primary Taxonomy261QM2500X

Legal Business NameSAGAPONACK MEDICAL PC

Location Address3350 NOYAC RDSag Harbor, NY 11963-1908

Mailing Address3350 Noyac RdSag Harbor, NY 11963-1908 · (631) 731-1099

Phone(631) 731-1099

Organization SubpartNo

Authorized OfficialMark A. HalseyPresident · (631) 731-1099

Enumeration DateMarch 29, 2018

Last NPPES UpdateJuly 8, 20266 updates tracked since enumeration

NPPES CertifiedJuly 8, 2026

✔ NPI 1407351646 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyClinic/Center · Medical SpecialtyAmbulatory Health Care Facilities

Taxonomy Code261QM2500X

Definition

An entity, facility, or distinct part of a facility providing diagnostic, treatment, and prescriptive services related to a specific area of medical specialization. Frequently used for Title V related Children's Specialty services or to meet specific public health needs (e.g., infectious diseases or breast and cervical cancer).

3350 NOYAC RD, Sag Harbor, NY 11963

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Other Names 2

Doing Business AsHalsey Dermatology

Doing Business AsSag Harbor Dermatology

Secondary Practice Location 1

Location 13330 Noyack RdSag Harbor, NY 11963-1930 · Phone (631) 731-1099

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Sagaponack Medical Pc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Sagaponack Medical PC, which bills Medicare for the services this clinician delivers.

Clinician (1)

Mark Halsey, MD

Dermatology

NPI 1790070480

3350 NOYAC RD
Sag Harbor, NY 11963

(631) 731-1099

✔ PECOS✔ Accepts MedicareSame address

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 Sagaponack Medical PC's NPI number?

The NPI number for Sagaponack Medical PC is 1407351646. It was assigned to this organization in the NPPES registry on March 29, 2018. The provider is doing business as Halsey Dermatology and Sag Harbor Dermatology.

Where is Sagaponack Medical PC located?

Sagaponack Medical PC is located at 3350 Noyac Rd, Sag Harbor, NY 11963. The listed phone number is (631) 731-1099.

What is Sagaponack Medical PC's specialty?

The primary specialty registered for this NPI is Clinic/Center, specializing in Medical Specialty, with taxonomy code 261QM2500X.

Is Sagaponack Medical PC enrolled in Medicare?

Yes. Sagaponack Medical PC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Sagaponack Medical PC?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Dermatology) reassigns their Medicare billing to Sagaponack Medical 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. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Sagaponack Medical PC was last updated on July 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.