Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Greenfield Optical, P.C.

Durable Medical Equipment & Medical Supplies in Elmhurst, IL · enumerated 2007 · authorized official Jeffrey Greenfield, Doctor/President.

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

National Provider Identifier

1427239656

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Registry record

Entity type Organization (Type 2)

Legal business name Greenfield Optical, P.C.

Practice address 210 N York St, Elmhurst, IL, 60126

Phone (630) 834-7710

Fax (630) 834-7713

Enumeration date Nov 15, 2007

Last updated in NPPES Dec 16, 2010

Taxonomy & classification

332B00000X Durable Medical Equipment & Medical Supplies Suppliers · License 046-008136 (IL) Primary

Authorized official

Name Jeffrey Greenfield

Title Doctor/President

Phone (630) 834-7710

Other identifiers

Identifier	Type	State	Issuer
DQ5672	Other	IL	RAILROAD MEDICARE
02222516	Other	IL	BCBSIL #

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

Where is Greenfield Optical, P.C. located?

The practice location on file with NPPES is in Elmhurst, IL.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2010-12-16. Verify at npiregistry.cms.hhs.gov.

Providers at this address

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Annalisa Jelonek Family Nurse Practitioner · Elmhurst, IL NPI 1942174321

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-12-16.