NPI Portal NPI Lookup & Verification

Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Greenwich Medical Associates, P.C.

Obstetrics & Gynecology Physician in Greenwich, CT · enumerated 2019 · authorized official Lorena Esparza, Revenue Cycle Manager.

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

National Provider Identifier

1821630724

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)
Legal business name Greenwich Medical Associates, P.C.
Practice address 500 W Putnam Ave Ste 435, Greenwich, CT, 06830
Phone (203) 861-7890
Fax (203) 861-7898
Enumeration date Oct 11, 2019
Last updated in NPPES Oct 11, 2019

Taxonomy & classification

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Lorena Esparza
Title Revenue Cycle Manager
Phone (630) 725-2764

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 is a Type 2 NPI?
A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.
What type of organization is Greenwich Medical Associates, P.C.?
Greenwich Medical Associates, P.C. is registered in NPPES as a Obstetrics & Gynecology Physician (its primary provider taxonomy).

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-10-11.