Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Charles River Eye Associates

Q: What type of organization is Charles River Eye Associates?

Charles River Eye Associates is registered in NPPES as a Specialist (its primary provider taxonomy).

Specialist in Winchester, MA · enumerated 2009 · authorized official Jack Greiner, Ophalmologist/Eye Surgeon.

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

National Provider Identifier

1619207487

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Registry record

Entity type Organization (Type 2)

Legal business name Charles River Eye Associates

Practice address 955 Main St, Suite 307, Winchester, MA, 01890

Phone (781) 729-3008

Fax (781) 729-2402

Enumeration date Dec 30, 2009

Last updated in NPPES Dec 30, 2009

Taxonomy & classification

174400000X Specialist Other Service Providers · License 56366 (MA) Primary

Authorized official

Name Jack Greiner

Title Ophalmologist/Eye Surgeon

Phone (781) 729-3008

Other identifiers

Identifier	Type	State	Issuer
1588601280	Other	-	NPI

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 type of organization is Charles River Eye Associates?

Charles River Eye Associates is registered in NPPES as a Specialist (its primary provider taxonomy).

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-12-30.