MARISSA DEFREESE MD
NPI 1194963462
Surgery - Surgical Critical Care in Stamford, CT
About Marissa Defreese Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARISSA DEFREESE MD (NPI 1194963462) is an individual surgical critical care provider in Stamford, Connecticut, licensed in Connecticut (047916) and active in the NPI registry since January 2009. She is enrolled in Medicare PECOS and is a graduate of Other (2003).
NPPES Registry Identity
Specialties & Licenses 2
Other Names 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Marissa Defreese Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
8Medicare enrollment records show Marissa Defreese reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Bakersfield, CA 93306
- Reassigned Medicare billing, California enrollment
- 532 clinicians in this Medicare group
Northridge, CA 91325
- Reassigned Medicare billing, California enrollment
- 9 clinicians in this Medicare group
Northridge, CA 91328
- Reassigned Medicare billing, California enrollment
- 14 clinicians in this Medicare group
Woodland Hills, CA 91364
- Reassigned Medicare billing, California enrollment
- 20 clinicians in this Medicare group
Thousand Oaks, CA 91360
- Reassigned Medicare billing, California enrollment
- 36 clinicians in this Medicare group
Sacramento, CA 95816
- Reassigned Medicare billing, California enrollment
- 266 clinicians in this Medicare group
Los Banos, CA 93635
- Reassigned Medicare billing, California enrollment
- 91 clinicians in this Medicare group
Petaluma, CA 94952
- Reassigned Medicare billing, California enrollment
- 37 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 9
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
STAMFORD, CT 06902
STAMFORD, CT 06902
STAMFORD, CT 06902
STAMFORD, CT 06902
STAMFORD, CT 06902
STAMFORD, CT 06902
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Marissa Defreese's NPI number?
The NPI number for Marissa Defreese is 1194963462. It was assigned to this individual provider in the NPPES registry on January 26, 2009. The provider is also known as Marissa Delgado MD.
Where is Marissa Defreese located?
Marissa Defreese practices at 29 Hospital Plaza 6th Floor, Stamford, CT 06902. The listed phone number is (203) 276-5959.
What is Marissa Defreese's specialty?
The primary specialty registered for this NPI is Surgery, specializing in Surgical Critical Care, with taxonomy code 2086S0102X.
Is Marissa Defreese enrolled in Medicare?
Yes. Marissa Defreese is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Marissa Defreese's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Marissa Defreese reassigns Medicare benefits to 8 organizations: Kern County Hospital Authority (Bakersfield, CA), Oaks Surgical Specialists, A Medical Corporation (Northridge, CA), Northridge Trauma Surgeons Inc A Medical Corporation (Northridge, CA), Compassionate Critical Care Group, Inc. (Woodland Hills, CA), Jaspreet Somal M.D., A.P.C. (Thousand Oaks, CA) and 3 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Marissa Defreese's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Marissa Defreese was last updated on February 7, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Marissa Defreese, MD · NPI 1194963462
Surgical Critical Care physician in Stamford, Connecticut. Individual provider, active in the CMS NPPES registry since January 26, 2009.
## Identity
- **NPI:** 1194963462 (Entity type: Individual)
- **Enumerated:** January 26, 2009
- **Primary specialty:** Surgery - Surgical Critical Care · taxonomy 2086S0102X
- **State license:** 047916 (Connecticut)
- **Sole proprietor:** No
## Practice location
- **Address:** 29 HOSPITAL PLAZA, 6TH FLOOR, Stamford, CT 06902-2419
- **Phone:** (203) 276-5959 · **Fax:** (203) 276-5969
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 8 organizations under Medicare reassignment (form CMS-855R): Kern County Hospital Authority (NPI 1376623538, Bakersfield, CA); Oaks Surgical Specialists, A Medical Corporation (NPI 1538560842, Northridge, CA); Northridge Trauma Surgeons Inc A Medical Corporation (NPI 1255418745, Northridge, CA); Compassionate Critical Care Group, Inc. (NPI 1295332633, Woodland Hills, CA); Jaspreet Somal M.D., A.P.C. (NPI 1154917318, Thousand Oaks, CA); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2003
## Record status
- **NPPES last updated:** February 7, 2017
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Source: [NPI Profile](https://npiprofile.com/npi/1194963462) · Data from the CMS NPPES public registry.