Dr. Marissa A. Defreese, MD

Dr. Defreese practices at Dignity Health - Northridge Hospital Medical Center in Northridge, California, part of CommonSpirit Health.

Dr. Defreese's NPI, 1194963462, was assigned on January 26, 2009. Dr. Defreese holds Connecticut license 047916.

Dr. Defreese's primary practice is Dignity Health - Northridge Hospital Medical Center, at 18300 Roscoe Blvd, Northridge, CA 91325 in Los Angeles County. The practice phone is (818) 885-8500.

Dr. Defreese's primary practice is Dignity Health - Northridge Hospital Medical Center in Northridge, California, part of CommonSpirit Health. Dr. Defreese is also affiliated with Desert Regional Medical Center. The medical group on file is Compassionate Critical Care. Dmand AI also links Dr. Defreese to 3 more hospitals, 7 medical groups and 1 group practice or clinic, each named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Defreese practices, 6 sites in all. Vendor and product names are available with a free account.

Surgical critical care is Dr. Defreese's primary specialty in the NPI Registry, under taxonomy code 2086S0102X. Dr. Defreese is licensed in Connecticut.

CMS data shows 558 Medicare services from Dr. Defreese across 9 procedure codes in 2024, for 407 Medicare patients. Medicare paid $70,004 for them. Every service was in a facility, such as a hospital, rather than an office.

CMS counts 407 Medicare patients who saw Dr. Defreese in 2024. The largest group is 75 to 84, with 145 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 26% are also on Medicaid. Their average risk score is 2.21, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Defreese's median patient age at 64, with 43% women.

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 88 out of 100 for Dr. Defreese for performance year 2024, reported as part of a group. Dr. Defreese accepts Medicare assignment, so Medicare's approved amount is taken as full payment.

Colonoscopy: 1 to 10 procedures (CMS shows small counts as a range)

Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)

Upper gastrointestinal (GI) endoscopy for acid reflux: 1 to 10 procedures (CMS shows small counts as a range)

CMS Open Payments shows 16 general payments to Dr. Defreese from 10 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 68% of the total. Zimmer Biomet Holdings, Inc. paid the most, $652.