NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Jeff G Wang, MD

Reproductive Endocrinology Physician in Greenwich, CT · enumerated 2007 · practices at American Fertility Services.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1225258338

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Registry record

Entity type Individual (Type 1)
Name Jeff G Wang
Credential MD
Sex Male
Practice address 100 Putnam Grn, Greenwich, CT, 06830
Phone (203) 774-9900
Enumeration date Apr 30, 2007
Last updated in NPPES Jan 6, 2021

Taxonomy & licenses

207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License 50428 (CT) Primary
207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License 223458 (NY) Secondary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Jeff Wang?
Jeff Wang is registered in NPPES with the primary taxonomy of Reproductive Endocrinology 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-01-06.