Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Cesar A Sierra MD LLC

Ophthalmology Physician in Westport, CT · enumerated 2007 · authorized official Cesar Sierra, Owner.

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

National Provider Identifier

1073702338

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Registry record

Entity type Organization (Type 2)

Legal business name Cesar A Sierra MD LLC

Practice address 125 Kings Hwy N Ste B, Westport, CT, 06880

Phone (203) 226-1696

Enumeration date Oct 23, 2007

Last updated in NPPES Apr 4, 2018

Taxonomy & classification

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 040323 (CT) Primary

Authorized official

Name Cesar Sierra

Title Owner

Phone (203) 226-1696

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 Cesar A Sierra MD LLC located?

The practice location on file with NPPES is in Westport, CT.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2018-04-04. Verify at npiregistry.cms.hhs.gov.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-04-04.