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About Dr. Yiannis Kallis

  • Dr. Yiannis Kallis is a Consultant Hepatologist and Gastroenterologist at the Royal London Hospital and the Royal Free Hospital, London.
  • He has expertise in a wide range of gastrointestinal diseases.
  • His special interests include liver disease and disorders of the pancreas and bile ducts.
  • He is highly skilled in diagnostic and therapeutic endoscopy.
  • He has particular expertise in ERCP (endoscopy of the bile duct and pancreatic duct).
  • Dr. Kallis is the Clinical Lead for Liver Diseases at the Royal London Hospital.
  • He also runs the North East London liver transplant network.
  • He graduated with distinction from Cambridge University.
  • He completed postgraduate speciality training at several leading London teaching hospitals.
  • He was awarded a PhD in 2010 from Imperial College London for research on liver fibrosis and regeneration.
  • His research has been published in leading peer-reviewed journals.

Conditions treated by Dr. Yiannis Kallis

  • Liver diseases (acute and chronic)
  • Cirrhosis and liver failure
  • Viral hepatitis (Hepatitis B, Hepatitis C)
  • Fatty liver disease (NAFLD and NASH)
  • Autoimmune liver diseases
  • Liver fibrosis and regeneration disorders
  • Liver cancer (Hepatocellular carcinoma)
  • Pancreatic disorders (including pancreatitis)
  • Bile duct disorders and blockages
  • Gallstones and related complications
  • Inflammatory disorders of the bile ducts

Area of Interest

  • Management of complex liver diseases (acute and chronic)
  • Disorders of the pancreas and bile ducts

Qualification

  • MA, MB BChir – Graduated with distinction from Cambridge University
  • Postgraduate speciality training at several leading London teaching hospitals
  • PhD – Imperial College London, research on liver fibrosis and regeneration (2010)

Work Experiences

    • Global Team of Board Certified Surgeons and Medical Specialists
    • Written Second Opinion report delivered within 5 days
    • Option to avail the Video Consultation with the Lead Doctor of the board

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    CERTIFICATIONS (1)

    • Fellowship of the Royal College of Physicians (FRCP)

    MEMBERSHIPS (1)

    • British Society for Gastroenterology (BSG) – Liver Committee Member

    RESEARCH PAPERS AND PUBLICATIONS (2)

    • Dr Kallis explains some of the effects of a weekend's drinking to Metro.
    • Alcohol-free challenges are now hugely popular, but do they offer lasting benefits? Dr Kallis explains.

    Share Your Experience about Dr. Yiannis Kallis

    PROCEDURES

    • Adhesion Lysis
    • Capsule Endoscopy
    • Cardiomyotomy
    • Endoscopy (UGI Endoscopy)
    • Foregut Surgery
    • Hiatal Hernia Repair
    • Ileoanal Anastomosis (J-Pouch) Surgery
    • Laparoscopic Colon Resection
    • Laparoscopic Ventral Hernia Repair
    • Low Anterior Resection
    • Meckel's Diverticulectomy Treatment
    • Nissen Fundoplication
    • Pancreatectomy
    • Pancreatic Surgery
    • Partial Colectomy
    • Peroral Endoscopic Myotomy (POEM)
    • Proctectomy
    • Retroperitoneum Surgery
    • Robotic Hernia Surgery
    • Small Bowel Resection
    • Splenectomy
    • Stapled Hemorrhoidopexy
    • Subtotal Proctocolectomy
    • Total Colectomy

    FREQUENTLY ASKED QUESTIONS

    Is Dr. Yiannis Kallis doing teleconsultation on the MediGence platform?

    Dr. Yiannis Kallis is available to teleconsult on the MediGence platform.

    How long is the consultation?

    The consultation can last from 15 to 30 minutes. It may exceed the estimated time, depending on the patient’s queries and the doctor's medical suggestions.

    How soon can the consultation be organised?

    We have Medical specialists and board-certified doctors on our panel of doctors. The consultation will be organised within 24 to 48 hours or based on the availability of the doctor and the patient.

    Is a follow-up consultation included in the consultation price?

    No, the follow-up consultation fee is not included in the consultation price. The patient will be required to re-book the consultation.

    How do I share my medical record with the doctor for review?

    The option to share your medical records is available between the steps of the form provided to you on the website.

    Can I book my procedure with the doctor post-consultation?

    Yes. If you are satisfied with the consultation, you can go ahead with treatment packages for your diagnosis with the help of our case managers.

    Can you get an estimate for the procedure?

    Yes. The cost estimate will be provided to you by our case manager, including the doctor’s opinion, the cost estimate, and crucial information about traveling to your medical destination.

    FAQ's Related to Gastroenterologist

    What does a hepatologist do?

    A hepatologist is a specialist doctor who focuses on the diagnosis, treatment, and management of liver diseases, bile duct disorders, gallbladder issues, and pancreatic problems.

    What conditions does a gastroenterologist treat?

    A gastroenterologist treats diseases of the digestive system, including the oesophagus, stomach, intestines, liver, pancreas, bile ducts, and gallbladder.

    When should I see a hepatologist?

    You should see a hepatologist if you have liver-related issues such as hepatitis, cirrhosis, fatty liver disease, liver cancer, abnormal liver tests, or complications related to liver function.

    What is the difference between a hepatologist and a gastroenterologist?

    A gastroenterologist manages all digestive system conditions, whereas a hepatologist is a gastroenterologist with additional expertise in liver, pancreas, bile ducts, and gallbladder disorders.

    What is ERCP and why is it performed?

    ERCP (Endoscopic Retrograde Cholangiopancreatography) is a specialised endoscopic procedure used to diagnose and treat problems in the bile ducts and pancreatic ducts, such as blockages, stones, or strictures.

    Do hepatologists also perform endoscopy?

    Yes, hepatologists trained in endoscopy can perform diagnostic and therapeutic endoscopic procedures, including ERCP, to manage bile duct and pancreatic conditions.

    Can liver disease be cured?

    Some liver conditions, such as hepatitis B and C, fatty liver, and autoimmune liver disease, can be treated effectively if diagnosed early. Advanced liver disease may require transplantation.

    How do gastroenterologists and hepatologists work with liver transplants?

    They evaluate patients for transplant, manage them before and after surgery, and coordinate care with transplant surgeons to ensure the best outcomes.

    Do I need a referral to see a hepatologist or gastroenterologist?

    In most cases, yes. Patients are usually referred by their GP or another specialist when specific liver or digestive issues are identified.

    What tests might a hepatologist recommend?

    Common tests include liver function tests, ultrasound, MRI/CT scans, FibroScan (to check liver stiffness), liver biopsy, and endoscopic procedures like ERCP.

    Reviewer

    Dr. Vijita Jayan
    Dr. Vijita Jayan

    BPT, MPT (Neuro)

    18 Years of Experience

    With over 18 years of distinguished clinical experience, Dr. Vijita Jayan is a highly accomplished Clinical Director and Rehabilitation Specialist, renowned for her expertise in neuro-rehabilitation, functional recovery, and mobility-dependent case management. Her extensive practical knowledge enables her to design and implement individualized, evidence-based rehabilitation protocols that consistently yield measurable patient outcomes. A prolific researcher and academic writer, she has authored numerous peer-reviewed articles and research papers, significantly advancing the field of rehabilitative medicine. The recipient of multiple prestigious accolades, Dr. Jayan is widely regarded as one of the foremost authorities in Physical Medicine and Rehabilitation, continually shaping neuro-rehabilitative care through research, innovation, and clinical excellence. View More

    Last Reviewed - January 2026

    Author

    Fauzia Zeb Fatima
    Fauzia Zeb Fatima

    M.Pharm

    4 Years of Experience

    Fauzia Zeb is a distinguished medical and scientific content writer with a robust academic foundation in pharmaceutical sciences, holding a B.Pharm and M.Pharm degree from prestigious institutions, including MIT and Jamia Hamdard University. Her comprehensive expertise in pharmacology, clinical sciences, and biomedical research enables her to translate complex medical and scientific concepts into precise, evidence-based content tailored for diverse audiences. Specializing in peer-reviewed articles, clinical blog posts, and research-driven publications, she demonstrates a consistent ability to bridge the gap between advanced medical science and accessible, audience-specific communication.. View More