JOHN OPPENHEIMER, M.D., PLLC
NPI 1780956441
Internal Medicine - Geriatric Medicine in Sag Harbor, NY

Q: What is John Oppenheimer, M.D., PLLC's NPI number?

The NPI number for John Oppenheimer, M.D., PLLC is 1780956441. It was assigned to this organization in the NPPES registry on January 27, 2012.

Q: What is John Oppenheimer, M.D., PLLC's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Geriatric Medicine, with taxonomy code 207RG0300X.

Active since January 27, 2012

60 BAY ST, SAG HARBOR, NY 11963(621) 725-4600 Get Directions Write a Review

NPPES record last updated: January 27, 2012. Verified against the NPPES registry weekly; last sync: October 18, 2026.

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About John Oppenheimer, M.d., Pllc NPPES

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

JOHN OPPENHEIMER, M.D., PLLC (NPI 1780956441) is a healthcare organization registered as a geriatric medicine in Sag Harbor, New York and active in the NPI registry since January 2012. The organization lists John Oppenheimer, Physican, as its authorized official.

NPPES Registry Identity

NPI1780956441

Entity TypeOrganization

Primary Taxonomy207RG0300X

Legal Business NameJOHN OPPENHEIMER, M.D., PLLC

Location Address60 BAY STSag Harbor, NY 11963-3106

Mailing AddressPo Box 3137Sag Harbor, NY 11963-0405 · (621) 725-4600

Phone(621) 725-4600

Organization SubpartNo

Authorized OfficialJohn OppenheimerPhysican · (631) 725-4600

Enumeration DateJanuary 27, 2012

✔ NPI 1780956441 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Geriatric MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207RG0300X

License✔ Licensed in NY · 150853

Definition

An internist who has special knowledge of the aging process and special skills in the diagnostic, therapeutic, preventive and rehabilitative aspects of illness in the elderly. This specialist cares for geriatric patients in the patient's home, the office, long-term care settings such as nursing homes and the hospital.

60 BAY ST, Sag Harbor, NY 11963

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

John Oppenheimer, M.d., Pllc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Medicare Revalidation Due Date

Revalidation due by December 31, 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 IDO20120320000405Non-DME Part B · Clinic/Group PracticeDue dateDecember 31, 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 John Oppenheimer, M.D., PLLC, which bills Medicare for the services this clinician delivers.

Clinician (1)

John Oppenheimer, M.D.

Internal Medicine

NPI 1659364214

60 BAY ST
Sag Harbor, NY 11963

(631) 725-4600

✔ 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 John Oppenheimer, M.D., PLLC's NPI number?

The NPI number for John Oppenheimer, M.D., PLLC is 1780956441. It was assigned to this organization in the NPPES registry on January 27, 2012.

Where is John Oppenheimer, M.D., PLLC located?

John Oppenheimer, M.D., PLLC is located at 60 Bay St, Sag Harbor, NY 11963. The listed phone number is (621) 725-4600.

What is John Oppenheimer, M.D., PLLC's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Geriatric Medicine, with taxonomy code 207RG0300X.

Is John Oppenheimer, M.D., PLLC enrolled in Medicare?

Yes. John Oppenheimer, M.D., PLLC is registered in the Medicare PECOS enrollment system.

When is John Oppenheimer, M.D., PLLC'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 December 31, 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 John Oppenheimer, M.D., PLLC?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Internal Medicine) reassigns their Medicare billing to John Oppenheimer, M.D., PLLC. 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 John Oppenheimer, M.D., PLLC was last updated on January 27, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.