Dr. Stephen Daniel Defronzo, MD

Dr. Defronzo practices at Overlook Medical Center in Summit, New Jersey, part of Atlantic Health System.

Dr. Defronzo's NPI, 1922056548, was assigned on May 5, 2006. Dr. Defronzo graduated from Universidad Autonoma de Guadalajara in 1980. Dr. Defronzo's New Jersey license number on file is 25MA04362300.

Dr. Defronzo's primary practice is Overlook Medical Center, at 99 Beauvoir Avenue, Summit, NJ 07901 in Union County. The practice phone is (908) 522-2000.

Dr. Defronzo's primary practice is Overlook Medical Center in Summit, New Jersey, part of Atlantic Health System. Dr. Defronzo is also affiliated with Morristown Medical Center.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Defronzo practices, 2 sites in all. Vendor and product names are available with a free account.

Infectious disease is Dr. Defronzo's primary specialty in the NPI Registry, under taxonomy code 207RI0200X. Dr. Defronzo is board certified in internal medicine by the American Board of Internal Medicine. Dmand AI has Dr. Defronzo's licenses on file in 2 states: New Jersey and New York.

Dmand AI lists acute skin infection, cold sores or genital herpes, hiv/aids, joint or bone infection and UTI among the conditions Dr. Defronzo treats.

CMS data shows 253 Medicare services from Dr. Defronzo across 4 procedure codes in 2024, all of them office visits, for 141 Medicare patients. Medicare paid $20,046 for them. Every service was in an office.

CMS counts 141 Medicare patients who saw Dr. Defronzo in 2024. The largest group is 65 to 74, with 69 patients. 74% of them have high cholesterol, and 72% have high blood pressure. 11% are also on Medicaid. Their average risk score is 1.27, where 1.00 is the Medicare average.

Across all payers, Dmand AI patient panel data puts Dr. Defronzo's median patient age at 63, with 49% women.

In 2024, Dr. Defronzo wrote 2,048 Medicare Part D claims for 209 patients. 68% of them were for generic drugs. CMS names the drug for 1,666 of them, across 51 drugs with 11 or more claims each, at $2,233,339 in total drug cost. In 2023, CMS named 1,861 claims across 51 drugs.

Dr. Defronzo accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Defronzo as offering telehealth.

CMS Open Payments shows 365 general payments to Dr. Defronzo from 21 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 92% of the total. ViiV Healthcare Company paid the most, $2,453.

Dmand AI lists 4 awards for Dr. Defronzo, most recently NJ Top Doctor in 2013.

Dr. Defronzo graduated from Universidad Autonoma de Guadalajara in 1980. Dr. Defronzo is a member of Infectious Disease society of New Jersey.

Dr. Defronzo is in network with 16 carriers, including Aetna, Elevance and United Healthcare. PPO plans come from the most carriers, 10. Check the plan with the practice before a visit.