Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Robert L. Weiss, MD, PC

Q: What type of organization is Robert L. Weiss, MD, PC?

Robert L. Weiss, MD, PC is registered in NPPES as a Specialist (its primary provider taxonomy).

Specialist in Norwalk, CT · enumerated 2007 · authorized official Robert Weiss, Owner.

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

National Provider Identifier

1174724199

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Registry record

Entity type Organization (Type 2)

Legal business name Robert L. Weiss, MD, PC

Practice address 40 Cross St Ste 230, Norwalk, CT, 06851

Phone (203) 845-2244

Fax (203) 845-2249

Enumeration date May 29, 2007

Last updated in NPPES Jan 16, 2008

Taxonomy & classification

174400000X Specialist Other Service Providers Primary

Authorized official

Name Robert Weiss

Title Owner

Phone (203) 845-2244

Other identifiers

Identifier	Type	State	Issuer
010022559CT01	Other	CT	ANTHEM
C01495	Other	CT	MEDICARE GROUP NUMBER
010037572CT01	Other	CT	ANTHEM

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 Robert L. Weiss, MD, PC?

Robert L. Weiss, MD, PC 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.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-01-16.