Demetrios Nectarios Mallios, MD

Cardiac Surgery, Heart Valve Repair
Accepting New Patients


Photo of Keck Hospital of USC
1500 San Pablo Street , Los Angeles, CA 90033
7 days a week, 24 hours a day
Photo of USC Norris Cancer Hospital
1441 Eastlake Ave , Los Angeles, CA 90089
7 days a week, 24 hours a day

Provider Details

Languages Spoken
English, Greek
About Demetrios Nectarios Mallios, MD
Demetrios N. Mallios, MD, is a board-certified cardiothoracic surgeon at Keck Medicine of USC. He specializes in the surgical management of congenital heart disease in both adults and children, with broad experience in a range of techniques used to treat the most complex heart conditions.

Dr. Mallios completed his residency in cardiothoracic surgery at the Keck School of Medicine of USC and Los Angeles General, formerly known as Los Angeles County + USC Medical Center. During that time, he spent a year as a clinical research fellow and was also named thoracic surgery resident of the year in 2021. He also served as a chief resident in 2022. Dr. Mallios then went on to complete a subspecialty fellowship at Children’s Hospital Los Angeles, again under the instruction of Dr. Vaughn A. Starnes.

Dr. Mallios has many clinical and research interests, including neonatal heart surgery, adult congenital heart disease and surgical management of the aortic root and aortic arch. He has presented research findings at multiple national and international meetings, including the American Association for Thoracic Surgery and the Society of Thoracic Surgeons. In addition, he has contributed to numerous studies in peer-reviewed medical journals.

Away from clinical practice, Dr. Mallios enjoys spending time exercising, trying out new recipes in the kitchen and exploring the Los Angeles food scene. He is fluent in Greek language and makes frequent trips back to Greece to visit with family and friends.
“Getting to know each of my patients on a personal level helps me appreciate his or her unique perspective, which allows for shared decision-making and formulation of a care plan that is both clinically sound and based on the individual patient’s wants and needs.”


  • Cardiac Surgery
  • Heart Valve Repair

Insurances Accepted

Note: Please contact the practice directly to confirm your health plan is accepted.

Benefits among health plans and employers vary. Please contact your health plan to verify benefits and network providers for specific products. It is important to note that not all of our providers participate in all of a health plan's products or networks.

  • Aetna
  • Watchtower
  • Medicare
  • Health Net
  • Presbyterian Intercommunity Hospital
  • Health Net Covered California
  • Anthem Blue Cross Covered California
  • TriWest Healthcare Alliance (UHC)
  • Beech Street Corporation /WC
  • Interplan
  • ChoiceCare Network
  • Anthem Blue Cross Prudent Buyer
  • Blue Shield Covered California
  • Blue Shield of California
  • Health Plans of Nevada
  • Kern Health Systems
  • Laundry and Dry Cleaning Workers Health & Welfare
  • Coventry Health Care
  • Marian Health Services
  • MultiPlan
  • First Health
  • NEXT
  • Pacificare
  • GEHA
  • Private Health Care Systems
  • Great-West Healthcare of California, Inc.
  • Take Care (GUAM)
  • Brand New Day
  • Union Roofers Health & Welfare Fund
  • United Healthcare
  • USC Network

Ratings and Reviews

  • Provider Explanations Easy to Understand
  • Provider Gave Easy to Understand Instructions
  • Provider Showed Respect
  • Provider Listened Carefully
  • Provider Knew Medical History
  • Provider Spent Enough Time

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