Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Peter J Siefken, PA

Individual provider Medical Physician Assistant · NPI 1144347261

Peter J Siefken, PA is a Physician Assistant in Amagansett, New York. Graduated from State University of New York at Stony Brook, School of Medicine in 1996, 30 years ago. Practices with City Medical of Upper East Side PLLC, a 663-clinician group and accepts Medicare assignment. Licensed in New York.

Years since qualifying
30
Trained at
State University of New York at Stony Brook, School of Medicine
Licensed in
NY
In the registry since
2007
What do these letters mean?
PA — Physician Assistant
A licensed clinician who examines, diagnoses and treats under a physician's supervision.

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Practice location Address checks out

518 Montauk Hwy Ste 102
Amagansett, NY 11930
Phone: (631) 267-5373
Fax: (631) 267-5376
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Medical Physician Assistant (primary) Taxonomy 363AM0700X · Licence 005732 (NY)

Record details

NPI number1144347261
Entity typeIndividual (Type 1)
GenderMale
Credentials PA
Sole proprietorNo
NPI enumeratedMarch 23, 2007
Last updated in NPPESDecember 5, 2016

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPHYSICIAN ASSISTANT
Medical schoolSTATE UNIVERSITY OF NEW YORK AT STONY BROOK, SCHOOL OF MEDICINE
Graduated 1996 (30 years in practice)
Group practice City Medical Of Upper East Side Pllc — 663 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients398
Services billed 1,177 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at City Medical of Upper East Side PLLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 663 clinicians in the practice; 12 are shown here.

Other providers in Amagansett