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FREDERICK E. SIEFERT, MD, PC
NPI 1417093683
Internal Medicine in Old Greenwich, CT

Active since January 29, 2007
8 W END AVE, OLD GREENWICH, CT 06870(203) 637-5406(203) 637-5408 Get Directions Write a Review

NPPES record last updated: September 10, 2007. Verified against the NPPES registry weekly; last sync: July 26, 2026.

About Frederick E. Siefert, Md, Pc NPPES

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

FREDERICK E. SIEFERT, MD, PC (NPI 1417093683) is a healthcare organization registered as an internal medicine in Old Greenwich, Connecticut and active in the NPI registry since January 2007. The organization lists Frederick E Siefert, President, as its authorized official.

NPPES Registry Identity

NPI1417093683
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameFREDERICK E. SIEFERT, MD, PC
Location Address8 W END AVEOld Greenwich, CT 06870-1642
Mailing Address8 W End AveOld Greenwich, CT 06870-1642 · (203) 637-5406 · Fax (203) 637-5408
Phone(203) 637-5406
Fax(203) 637-5408
Organization SubpartNo
Authorized OfficialFrederick E SiefertPresident · (203) 637-5406
Enumeration DateJanuary 29, 2007
Last NPPES UpdateSeptember 10, 2007
✔ NPI 1417093683 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
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.
8 W END AVE, Old Greenwich, CT 06870
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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

Other Providers at the Same Location NPPES 19

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

MRS. COURTNEY LIEBOWITZ PA-C
Physician Assistant
8 W END AVE
OLD GREENWICH, CT 06870
Western Connecticut Planning Region (203) 637-3212
THERESE ANN BERNSTEIN APRN
Nurse Practitioner (Pediatrics)
8 W END AVE
OLD GREENWICH, CT 06870
Western Connecticut Planning Region (203) 637-3212
DR. MELANIE SHARON KELTON M.D.
Internal Medicine
8 W END AVE
OLD GREENWICH, CT 06870
Western Connecticut Planning Region (203) 637-5400
JENNIFER SARAH MILLMAN MD
Pediatrics
8 W END AVE
OLD GREENWICH, CT 06870
Western Connecticut Planning Region (203) 637-3212
DR. BURTON RICHARD RUBIN M.D.
Internal Medicine
8 W END AVE
OLD GREENWICH, CT 06870
Western Connecticut Planning Region (203) 637-5406
DR. REBECCA LIPTON WARKOL MD
Internal Medicine
8 W END AVE
OLD GREENWICH, CT 06870
Western Connecticut Planning Region (203) 637-5406
AMY KAPPELMAN M.D.
Pediatrics
8 W END AVE, GREENWICH PEDIATRIC ASSOCIATES
OLD GREENWICH, CT 06870
Western Connecticut Planning Region (203) 637-3212
REBECCA WARKOL MD LLC
Internal Medicine
8 W END AVE
OLD GREENWICH, CT 06870
Western Connecticut Planning Region (203) 637-5406

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 Frederick E. Siefert, MD, PC's NPI number?

The NPI number for Frederick E. Siefert, MD, PC is 1417093683. It was assigned to this organization in the NPPES registry on January 29, 2007.

Where is Frederick E. Siefert, MD, PC located?

Frederick E. Siefert, MD, PC is located at 8 W End Ave, Old Greenwich, CT 06870. The listed phone number is (203) 637-5406.

What is Frederick E. Siefert, MD, PC's specialty?

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

When was this NPI record last updated?

The NPPES record for Frederick E. Siefert, MD, PC was last updated on September 10, 2007. NPI Profile syncs with the weekly NPPES data releases published by CMS.