Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Marissa Defreese, MD

Surgical Critical Care Physician in Stamford, CT · enumerated 2009.

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

National Provider Identifier

1194963462

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Registry record

Entity type Individual (Type 1)

Name Marissa Defreese

Credential MD

Sex Female

Practice address 29 Hospital Plaza, 6th Floor, Stamford, CT, 06902

Phone (203) 276-5959

Fax (203) 276-5969

Enumeration date Jan 26, 2009

Last updated in NPPES Feb 7, 2017

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 047916 (CT) Secondary

2086S0102X Surgical Critical Care Physician Allopathic & Osteopathic Physicians · License 047916 (CT) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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.

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Frequently asked questions

What is the NPI number for Marissa Defreese?

The National Provider Identifier (NPI) for Marissa Defreese is 1194963462, a Type 1 (individual) record in the CMS NPPES registry.

Where does Marissa Defreese practice?

The practice location on file with NPPES is in Stamford, CT. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-02-07.