Dr. Gregory P. Fontana, MD

Dr. Fontana practices at Los Robles Regional Medical Center in Thousand Oaks, California, part of HCA Healthcare.

Dr. Fontana's NPI, 1508840570, was assigned on December 2, 2005. Dr. Fontana graduated from David Geffen School of Medicine at UCLA in 1984. Dr. Fontana's New York license number on file is 263949.

Dr. Fontana's primary practice is Los Robles Regional Medical Center, at 215 W Janss Rd, Thousand Oaks, CA 91360 in Ventura County. The practice phone is (805) 497-2727.

Dr. Fontana's primary practice is Los Robles Regional Medical Center in Thousand Oaks, California, part of HCA Healthcare. The medical group on file is Moorpark Comprehensive Medical Group.

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

Thoracic surgery (cardiothoracic vascular surgery) is Dr. Fontana's primary specialty in the NPI Registry, under taxonomy code 208G00000X. Dr. Fontana is board certified in thoracic and cardiac surgery by the American Board of Thoracic Surgery. Dmand AI has Dr. Fontana's licenses on file in 3 states: New York, California and North Carolina.

Dmand AI lists heart bypass surgery and heart valve surgery among the conditions Dr. Fontana treats.

CMS data shows 361 Medicare services from Dr. Fontana across 9 procedure codes in 2024, for 191 Medicare patients. Medicare paid $64,978 for them. Every service was in a facility, such as a hospital, rather than an office.

CMS counts 191 Medicare patients who saw Dr. Fontana in 2024. The largest group is 75 to 84, with 81 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 8% are also on Medicaid. Their average risk score is 1.76, 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. Fontana's median patient age at 80, with 29% women.

In 2024, Dr. Fontana wrote 25 Medicare Part D claims for 11 patients. 64% of them were for generic drugs. CMS names the drug for 22 of them, across 1 drug with 11 or more claims each, at $188 in total drug cost. In 2019, CMS named 36 claims across 1 drug.

Dr. Fontana accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 33 procedures of coronary artery bypass graft (cabg) by Dr. Fontana, more than 86% of the clinicians it reports for that procedure.

Dmand AI links 35 papers to Dr. Fontana, published from 2011 to 2024. 2012 was the busiest year, with 5. The most frequent topics are Cardiac Catheterization, Heart Valve Prosthesis Implantation and Aortic Valve Stenosis. Dr. Fontana has published most often in Lancet. Dr. Fontana's most frequent co-authors are Raj R. Makkar, MD, Vasilis C. Babaliaros, MD and Martin Bert Leon, MD.

Dmand AI links Dr. Fontana to 8 clinical trials. 6 are still active or recruiting. Conditions studied include Ventricular Outflow Obstruction, Aortic Valve Stenosis and Angina Pectoris. Abbott Medical Devices sponsors the most, 3.

CMS Open Payments shows 2,373 general payments to Dr. Fontana from 47 drug and device companies from 2016 to 2025. Consulting fees make up the largest share, 46% of the total. Medtronic, Inc. paid the most, $508,502. It also lists 18 research payments totaling $14,888 from 2024 to 2025.

Dmand AI lists 5 awards for Dr. Fontana, most recently America's Top Doctors in 2014.

Dr. Fontana graduated from David Geffen School of Medicine at UCLA in 1984. Dr. Fontana is a member of AATS, ACC, ACS, European Association of Cardiothoracic Surgery, International Society for Minimally Invasive Cardiothoracic Surgery and STS.

Dr. Fontana is in network with 14 carriers, including Elevance, Blue Cross Blue Shield of Michigan and United Healthcare. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.