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WILLIAM SCHLESINGER MD, PC
NPI 1427130780
Anesthesiology - Pain Medicine in Syosset, NY

Active since October 19, 2006
121 EILEEN WAY, SYOSSET, NY 11791(516) 487-9140(516) 487-9143 Get Directions Write a Review

NPPES record last updated: January 6, 2022. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Jan 6, 2022, Aug 22, 2020 (2 updates tracked since 2020).

About William Schlesinger Md, Pc NPPES

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

WILLIAM SCHLESINGER MD, PC (NPI 1427130780) is a healthcare organization registered as a pain medicine in Syosset, New York and active in the NPI registry since October 2006. The organization lists William Schlesinger, Doctor, as its authorized official.

NPPES Registry Identity

NPI1427130780
Entity TypeOrganization
Primary Taxonomy207LP2900X
Legal Business NameWILLIAM SCHLESINGER MD, PC
Location Address121 EILEEN WAYSyosset, NY 11791-5302
Mailing Address1 Pebble LnRoslyn Heights, NY 11577-2711 · (516) 487-9140 · Fax (516) 487-9143
Phone(516) 487-9140
Fax(516) 487-9143
Organization SubpartNo
Authorized OfficialWilliam SchlesingerDoctor · (516) 487-9140
Enumeration DateOctober 19, 2006
Last NPPES UpdateJanuary 6, 20222 updates tracked since enumeration
NPPES CertifiedJanuary 6, 2022
✔ NPI 1427130780 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiology · Pain MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207LP2900X
License✔ Licensed in NY · 195649
Definition
An anesthesiologist who provides a high level of care, either as a primary physician or consultant, for patients experiencing problems with acute, chronic and/or cancer pain in both hospital and ambulatory settings. Patient care needs are also coordinated with other specialists.
121 EILEEN WAY, Syosset, NY 11791
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Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

William Schlesinger Md, Pc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Medicare Revalidation Due Date

Revalidation due by November 30, 2026

Medicare-enrolled providers and suppliers confirm their enrollment information with CMS on a set cycle, every 5 years for most and every 3 years for medical equipment suppliers. CMS sets the due date for each enrollment.

StateEnrollment IDDue date
StateNew YorkEnrollment IDO20061024000650Non-DME Part B · Clinic/Group PracticeDue dateNovember 30, 2026
Source: CMS Revalidation Due Date List, October 2026 release.

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to William Schlesinger MD, PC, which bills Medicare for the services this clinician delivers.

Clinician (1)

William Schlesinger, M.D
Anesthesiology
NPI 1811921307
170 GREAT NECK RD SUITE LL2
Great Neck, NY 11021
(516) 487-9140
✔ PECOS✔ Accepts Medicare11 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 William Schlesinger MD, PC's NPI number?

The NPI number for William Schlesinger MD, PC is 1427130780. It was assigned to this organization in the NPPES registry on October 19, 2006.

Where is William Schlesinger MD, PC located?

William Schlesinger MD, PC is located at 121 Eileen Way, Syosset, NY 11791. The listed phone number is (516) 487-9140.

What is William Schlesinger MD, PC's specialty?

The primary specialty registered for this NPI is Anesthesiology, specializing in Pain Medicine, with taxonomy code 207LP2900X.

Is William Schlesinger MD, PC enrolled in Medicare?

Yes. William Schlesinger MD, PC is registered in the Medicare PECOS enrollment system.

When is William Schlesinger MD, PC's Medicare revalidation due?

According to the CMS Revalidation Due Date List (October 2026 release), the Medicare Non-DME Part B enrollment for this organization (New York, Clinic/Group Practice) is due for revalidation by November 30, 2026. Medicare providers and suppliers revalidate their enrollment every 5 years, and medical equipment suppliers every 3 years. Confirm current requirements with your Medicare Administrative Contractor.

How many clinicians bill Medicare through William Schlesinger MD, PC?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Anesthesiology) reassigns their Medicare billing to William Schlesinger MD, 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 William Schlesinger MD, PC was last updated on January 6, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years 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.