Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Brett Gerstenhaber MD LLC

Q: What type of organization is Brett Gerstenhaber MD LLC?

Brett Gerstenhaber MD LLC is registered in NPPES as a Pulmonary Disease Physician (its primary provider taxonomy).

Pulmonary Disease Physician in Hamden, CT · enumerated 2014 · authorized official Brett Gerstenhaber, Owner.

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

National Provider Identifier

1134542178

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)

Legal business name Brett Gerstenhaber MD LLC

Practice address 2080 Whitney Ave, Suite 210, Hamden, CT, 06518

Phone (203) 248-8800

Fax (203) 288-5264

Enumeration date Jan 28, 2014

Last updated in NPPES Jan 28, 2014

Taxonomy & classification

207RP1001X Pulmonary Disease Physician Allopathic & Osteopathic Physicians · License 17778 (CT) Primary

Authorized official

Name Brett Gerstenhaber

Title Owner

Phone (203) 248-8800

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 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.

What type of organization is Brett Gerstenhaber MD LLC?

Brett Gerstenhaber MD LLC is registered in NPPES as a Pulmonary Disease Physician (its primary provider taxonomy).

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-01-28.