Constantine Mantz

Constantine Mantz

Health Policy Council Vice-chair

21st Century Oncology Inc., Fort Myers, Florida


  • MD, University of Chicago, 1995.
  • BS, Biology, University of Chicago, 1990.

Postgraduate Education

  • Residency, Radiation Oncology, University of Chicago, 1996 – 2000.
  • Internship, General Surgery, Hennepin County Medical Center, Minneapolis, 1995 – 1996.

Service To ASTRO

  • Co-chair, Health Policy Committee, 2017 – present.
  • Chair, Rural Task Force Supervision Workgroup, 2019 – present.
  • Ex Officio, Payer Relations Subcommittee, 2018 – present.
  • Ex Officio, Code Utilization and Application Subcommittee, 2018 – present.
  • Ex Officio, Code Development and Valuation Subcommittee, 2018 – present.
  • Member, Coding and Coverage Seminar, 2017 – present.
  • Member, Payment Reform Workgroup, 2014 – present.
  • Member, Health Policy Committee, 2014 – 2017.
  • Immediate Past Chair, Payer Relations Subcommittee, 2017 – 2018.
  • Member, Code Utilization and Application Subcommittee, 2014 – 2018.
  • Chair, Payer Relations Subcommittee, 2015 – 2017.
  • Member, Practice Accreditation Committee, 2013 – 2016.
  • Member, Health Information Technology Subcommittee, 2010 – 2016.
  • Vice-chair, Payer Relations Subcommittee, 2014 – 2015.
  • Chair, Practice Accreditation Appeals Committee, 2014 – 2015.
  • Member, Payer Relations Subcommittee, 2013 – 2014.
  • Member, Practice Accreditation Workgroup, 2012 – 2013.
  • Member, Regulatory Subcommittee, 2011 – 2013.

Service to Other Oncology and Radiology Organizations

  • Member, American Board of Radiology GU Committee, 2016 – present.
  • Board Member, The Radiosurgery Society, 2013 – 2016.

Biographical Statement

After completing residency, I entered private practice in 2000 and joined a large single-specialty practice in Florida. Since then, my physician practice has grown into a very large multi-specialty oncology services company. During this period of growth, I was fortunate to become involved in various key administrative projects related to payer contracting, revenue cycle management, business intelligence and compliance and to have been mentored by smart people in each of these functions that are critical to the business of medicine. One specific project worth mentioning is my company’s design and execution of an alternative payment model for radiation oncology in 2012, which was a first between a practice and a commercial insurer. That agreement remains active today, and our company has executed similar agreements since then with other private payers.

Over time, it became clear to me that ASTRO’s Health Policy committees were addressing many of the same problems – improper claims denials, incorrect coding, out-of-date coverage policies, and others – that I needed to solve within my administrative capacity for my company. I first joined the Payer Relation Committee and was impressed with the seriousness and efficiency with which the group worked in effectively managing coverage problems related to Medicare and private insurance policies. I have since worked on all other Health Policy committees and currently serve as Health Policy Co-chair. Looking ahead, I believe that Health Policy staff and members have accrued valuable knowledge that will be brought to bear on the upcoming challenges of payment reform in our specialty.