Dr Yiannis Kallis


MA (Cantab), MB , BChir, PhD , FRCP

GMC number: 4583211

Practising since: 1998


Gastroenterology, General (internal) Medicine

Sub-specialties: Hepatology

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Dr Yiannis Kallis has been a consultant hepatologist and gastroenterologist since 2011. He divides his time between Barts Health NHS Trust (Royal London Hospital) and the Royal Free Hospital. He graduated from Cambridge University with distinction in 1998, and completed his postgraduate medical training in London. 

Dr. Yiannis Kallis  is Network Director for Hepatology for Barts Health and is Clinical Lead for the service at the Royal London Hospital.  He is local MDT lead for ERCP and PBC services, and runs an outreach liver transplant service for NE London. He sits on national clinical guideline committees, serves as specialist advisor to NICE, and is a serving member on national liver society committees. 

Special interests

Dr. Yiannis particular interests lie in chronic liver disease, disorders of the bile ducts (PSC, PBC), advanced therapeutic endoscopy and in liver transplantation.

Personal interests

When not working, Dr. Yiannis enjoys cycling, cooking and spending time with his young family.

Treatments and tests offered by Dr Yiannis Kallis at Nuffield Health

  • Colonoscopy
  • Gastroscopy (or gastrointestinal (GI) endoscopy)
  • Flexible sigmoidoscopy
  • Diagnostic endoscopy
  • Therapeutic Endoscopy
  • Endoscopic retrograde cholangio-pancreatogram (or ERCP)
  • Liver function tests

Locations Dr Yiannis Kallis works with

Related experience


Dr Kallis completed his PhD at Imperial College London on liver stem cells in fibrosis and regeneration. He is an Honorary Senior Lecturer at Barts and the London, QMUL and has published widely in high impact medical journals. He is principal investigator on a number of clinical trials for new therapies in liver disease and his main areas of research interest are in biliary disorders, treatments for cirrhosis and in advanced therapeutic endoscopy. 


  • BASL
  • BSG
  • EASL
  • RCP

Other posts held

  • Consultant Hepatologist at Barts Health NHS Trust

Insurers Dr Yiannis Kallis works with

Dr Yiannis Kallis works with the following private medical insurance providers:

  • Aviva Health
  • AXA Health
  • Bupa
  • Simplyhealth
  • Vitality Health (Pru Health)
  • WPA
  • Cigna
  • Allianz


Dr Yiannis Kallis does not hold a share or financial interest in this hospital, another Nuffield Health hospital or the company.

Dr Yiannis Kallis does not have a share or financial interest in equipment used at this hospital or another Nuffield Health hospital.

Dr Yiannis Kallis does not hold any paid advisory role(s) at this hospital or on behalf of Nuffield Health.