Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Frederick Greenstein, M.D.
Urology Physician in Brooklyn, NY · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1174583686
See something wrong? Report a correction
Registry record
Entity type Individual (Type 1)
Name Dr. Frederick Greenstein
Credential M.D.
Sex Male
Practice address One Brookdale Plaza, Men'S Health - Suite 500, Brooklyn, NY, 11212
Phone (718) 240-8672
Fax (718) 240-5808
Enumeration date Mar 27, 2006
Last updated in NPPES May 18, 2020
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 00715013 | Medicaid | NY | - |
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
What specialty is Frederick Greenstein?
Frederick Greenstein is registered in NPPES with the primary taxonomy of Urology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Other providers at this practice address
Browse all → Gary Friedman Neurology Physician · Brooklyn, NY NPI 1033170931 Paul Haser Vascular Surgery Physician · Brooklyn, NY NPI 1164487724 The Brookdale Hospital Medical Center General Acute Care Hospital · Brooklyn, NY NPI 1356307656 Valerie Williams Obstetrics & Gynecology Physician · Brooklyn, NY NPI 1528087228 Charles Bigajer & Robert S Tracer MD Pllc Gastroenterology Physician · Brooklyn, NY NPI 1033298575 Charles Bigajer Gastroenterology Physician · Brooklyn, NY NPI 1679652119 Stephan Carlson Psychiatry Physician · Brooklyn, NY NPI 1275680068 Leonard Gallo Pediatric Dentistry · Bklyn, NY NPI 1235271735
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-05-18.