Appointments and Second Opinions

Speak with one of our New Patient Coordinators to schedule an appointment, refer a patient or request a second opinion. In urgent cases, we can typically see new patients within 24 hours.

Contact us
Find Clinical Trials

We sponsor and collaborate on clinical trials that break new ground in pediatric cancer and blood disorder treatment. 

Search Pediatric Cancer and Blood Disorder Clinical Trials
Our Affiliations
HMS Affiliate

Dana-Farber/Boston Children's is a teaching affiliate of Harvard Medical School.

Our Affiliations

Riten Kumar, MD, MSc

  • Director of Thrombosis and Anticoagulation
  • Physician
  • Associate Professor of Pediatrics, Harvard Medical School

Appointment Phone

  • 617-632-3270 (Established Pediatric Patients)
  • 888-733-4662 (New Pediatric Patients)


  • 617-632-6903


Treatment Centers




Board Certifications

  • Pediatric Hematology/Oncology, 2013
  • Pediatrics, 2009


  • Hospital for Sick Children/University of Toronto, 2013
  • Mayo Clinic, 2011


  • State University of New York, Downstate, 2008

Medical School

  • Medical College of Calcutta/University of Calcutta, 2004


Dr. Riten Kumar is the clinical director of the Thrombosis and Anticoagulation Program at Dana-Farber/Boston Children's Cancer and Blood Disorders Center. Dr. Kumar received his medical degree from Calcutta Medical College in India. He then completed his pediatric residency at State University of New York. He finished his pediatric hematology-oncology fellowship at the Mayo Clinic in Minnesota while also receiving his Master's in Clinical and Translational Science from the Mayo School of Graduate Medical Education. In 2013, he completed a second fellowship in Pediatric Thrombosis and Hemostasis at the Hospital for Sick Children, University of Toronto in Canada.