Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Michael J. Brennan, M.D. LLC

Pain Medicine (Physical Medicine & Rehabilitation) Physician in Fairfield, CT · enumerated 2006 · authorized official Michael Brennan, President.

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

National Provider Identifier

1700997848

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Registry record

Entity type Organization (Type 2)

Legal business name Michael J. Brennan, M.D. LLC

Practice address 140 Sherman St, 2nd Floor, Fairfield, CT, 06824

Phone (203) 255-3451

Fax (203) 255-7478

Enumeration date Aug 31, 2006

Last updated in NPPES Jun 24, 2008

Taxonomy & classification

111N00000X Chiropractor Chiropractic Providers Secondary

2081P2900X Pain Medicine (Physical Medicine & Rehabilitation) Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Michael Brennan

Title President

Phone (203) 255-3451

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 Michael J. Brennan, M.D. LLC located?

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

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2008-06-24. Verify at npiregistry.cms.hhs.gov.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-06-24.