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JOHN K OPPENHEIMER M.D.
NPI 1659364214
Internal Medicine in Sag Harbor, NY

Active since August 29, 2005PECOS EnrolledAccepts Medicare Assignment
60 BAY ST, SAG HARBOR, NY 11963(631) 725-4600(631) 725-6073 Get Directions Write a Review

NPPES record last updated: August 21, 2009. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About John K Oppenheimer M.d. NPPES

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

JOHN K OPPENHEIMER M.D. (NPI 1659364214) is an individual internal medicine provider in Sag Harbor, New York, licensed in New York (150853) and active in the NPI registry since August 2005. He is enrolled in Medicare PECOS, is affiliated with Suny/stony Brook University Hospital, and is a graduate of Tulane University School Of Medicine (1981).

NPPES Registry Identity

NPI1659364214
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameJOHN K OPPENHEIMERCredential: M.D.
Location Address60 BAY STSag Harbor, NY 11963-3106
Mailing AddressPo Box 3137Sag Harbor, NY 11963-0405 · (631) 725-4600 · Fax (631) 725-6073
Phone(631) 725-4600
Fax(631) 725-6073
Sole ProprietorYes
Medical School CMSTulane University School Of MedicineGraduated 1981
Enumeration DateAugust 29, 2005
Last NPPES UpdateAugust 21, 2009
✔ NPI 1659364214 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in NY · 150853
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
60 BAY ST, Sag Harbor, NY 11963
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Other Identifiers 2

Medicare UPINCO7582NY
Medicare ID-Type Unspecified27D922NY

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

John K Oppenheimer M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID3274678131
PECOS Enrollment IDI20100303000200
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show John Oppenheimer reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

John Oppenheimer, M.D., PLLC
Same address
Geriatric Medicine
60 BAY ST
Sag Harbor, NY 11963
  • Reassigned Medicare billing, New York enrollment
  • Medicare enrollment name: John Oppenheimer MD PLLC
NPI 1780956441 (621) 725-4600

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

Areas of Expertise CMS Part B claims 8

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
311 services143 patients
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215
This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.
141 services136 patients
Influenza vaccine split virus, preservative free 90662
The Influenza Vaccine Split Virus, preservative-free, is a flu shot to protect against the influenza virus. It is made from parts of inactivated flu viruses and doesn't contain preservatives, reducing potential side effects. It helps your body develop immunity to the flu.
84 services84 patients
Administration of influenza virus vaccine G0008
The administration of the influenza virus vaccine, also known as the flu shot, is a simple procedure to protect against the flu. A healthcare provider injects a small dose of the vaccine into your arm. This stimulates your immune system to produce antibodies, which will help your body fight off the flu if exposed.
82 services82 patients
Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use 90677
The Pneumococcal Conjugate Vaccine (PCV20) is a shot given to protect against 20 types of bacteria that can cause serious infections like pneumonia and meningitis. It's administered through a muscle, usually in the arm. It's important for overall health.
52 services52 patients
Administration of pneumococcal vaccine G0009
The pneumococcal vaccine helps protect against pneumococcal bacteria, which can cause severe infections like pneumonia and meningitis. The vaccine is given as an injection, typically in the arm. It's recommended for infants, older adults, and those with certain health conditions.
47 services47 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Suny/Stony Brook University Hospital

Acute Care Hospitals · Stony Brook, NY
4/5 CMS rating
OwnershipGovernment - State
CMS Certification Number330393
LocationHealth Sciences Center SunyStony Brook, NY 11794 · Suffolk County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 11963 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$154.28 typical visit price
range $67.40 – $203.53
Typical copayment $38.57 (range $16.85 – $50.88)
Most-billed visit code 99204
Established Patient
$117.62 typical visit price
range $21.66 – $164.45
Typical copayment $29.40 (range $5.41 – $41.11)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JOHN OPPENHEIMER, M.D., PLLC
Internal Medicine (Geriatric Medicine)
60 BAY ST
SAG HARBOR, NY 11963
Suffolk County (621) 725-4600

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's NPI number?

The NPI number for John Oppenheimer is 1659364214. It was assigned to this individual provider in the NPPES registry on August 29, 2005.

Where is John Oppenheimer located?

John Oppenheimer practices at 60 Bay St, Sag Harbor, NY 11963. The listed phone number is (631) 725-4600.

What is John Oppenheimer's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is John Oppenheimer enrolled in Medicare?

Yes. John Oppenheimer is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for John Oppenheimer's services?

According to the CMS Revalidation Reassignment List (October 2026 release), John Oppenheimer reassigns Medicare benefits to John Oppenheimer, M.D., PLLC (Sag Harbor, NY). The 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 John Oppenheimer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is John Oppenheimer affiliated with any hospitals?

According to CMS data, John Oppenheimer is affiliated with Suny/Stony Brook University Hospital.

When was this NPI record last updated?

The NPPES record for John Oppenheimer was last updated on August 21, 2009. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.