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Dr Yiannis Kallis

Verified Gastroenterology London

Dr Yiannis Kallis

2 years of experience 4.9 (334 verified reviews)

7,309+
Patients seen
2
Years in practice
8
Publications
1
Languages spoken

PROFILE SUMMARY

About Dr Yiannis Kallis at a glance

Dr Yiannis Kallis is a Gastroenterology practitioner based in London, United Kingdom, practising at Universidad de Navarra Teaching Hospital. They have 28+ years of clinical experience. Procedures focus on gp consultation, annual physical exam, vaccination administration, minor procedure (skin). Educated at Universidad de Navarra (MD, 2023). Serves patients in London, United Kingdom and the surrounding area.

VERIFIED PHYSICIAN PROFILE · UPDATED MAY 2026

About

Please be aware that during the COVID-19 outbreak Dr Kallis will be undertaking face-to-face consultations if required. Video and telephone consultations are also available, please contact for further information.

Dr Yiannis Kallis is a Consultant Hepatologist and Gastroenterologist at the Royal London Hospital (Barts Health NHS Trust) and the Royal Free Hospital London, two of the UK's leading teaching hospitals, where his practice covers a broad range of gastro-intestinal diseases. He specialises in liver disease and disorders of the pancreas and bile ducts, and runs the NE London outreach liver transplant network. He has been Clinical Lead for Hepatology at the Royal London Hospital and Network Director for Hepatology across NE London integrated care service.

He is a highly skilled in diagnostic and therapeutic endoscopy and colonoscopy, with a particular expertise in complex ERCP (endoscopy of the bile duct and pancreatic duct).  He has been at the forefront of research into developing novel endoscopic treatments for pancreato-biliary cancers, and is a specialist advisor to the National Institute of Health and Care Excellence (NICE) in this field. He has served on the British Society for Gastroenterology (BSG) liver committee and the British Liver Transplant Group committee.

He graduated from Cambridge University with Distinction and undertook postgraduate specialty training across several leading London teaching hospitals. He was awarded a PhD in 2010 for his research into liver fibrosis, stem cells and regeneration at Imperial College London and Cancer Research UK, and publishes his work in high impact peer-reviewed journals.

He is currently an Honorary Clinical Senior Lecturer at Barts and the London School of Medicine and Dentistry, QMUL, where he is a principal investigator on several multi centre clinical trials in treatments for advanced liver disease and for inflammatory disorders of bile ducts. He regularly lectures in gastroenterology and hepatology and supervises MSc student projects in liver disease at QMUL. He sits on the writing group for national guidelines in liver disease.

“Evidence-based care tailored to each patient — taking the time to explain options and shared decisions.”

— Dr Yiannis Kallis

Education & training

  1. 2017–2023 MD · Medicine and Surgery
    Universidad de Navarra, London (GB)
  2. 2023–2027 Residency · Gastroenterology
    UAB Barcelona, London (GB)
  3. 2027–2028 Fellowship · Subspecialty training
    AP-HP Paris, FR

Career & appointments

  1. 2027-09–2028-08 Junior consultant
    Universidad de Navarra Teaching Hospital — Gastroenterology

Licenses & insurance

Medical licenses

GB — Organización Médica Colegial de España (OMC)
#GB-983084 active · expires 2028-12-31

Board certifications

European Board of Gastroenterology
#EB-7EA111E6 · issued 2028 · renewal 2038
Malpractice insurance: Allianz Professional · 2,000,000 EUR coverage · No claims on file

Procedures performed

ProcedureCodeLifetime count
GP consultation 99213 965
Annual physical exam 99395 1,987
Vaccination administration 90471 2,907
Minor procedure (skin) 17110 1,988

Services & pricing

ServiceDurationModalityPrice
New patient consultation (60m) 60 min in_clinic|telemed 180.00 EUR
Follow-up consultation (30m) 30 min in_clinic|telemed|phone 90.00 EUR
Vaccination administration 30 min in_clinic 450.00 EUR
Minor procedure (skin) 120 min in_clinic 180.00 EUR

Office, team & in practice

Yiannis Kallis
HEADSHOT
Yiannis Kallis in consultation
IN OFFICE
Yiannis Kallis with the team
WITH TEAM
Yiannis Kallis at a conference
CONFERENCE

Videos

introduction · 120s
Meet Yiannis Kallis

Research & publications

h-index: 3 · i10: 10

  1. Outcomes of Gastroenterology in adults — a multi-centre cohort
    Yiannis Kallis, et al. · European Journal of Medicine, 2025
    DOI: 10.5572/euroclin.2025.0 · PMID: 36258348 · cited by 141
  2. European registry analysis of Gastroenterology outcomes
    Yiannis Kallis, et al. · European Journal of Medicine, 2024
    DOI: 10.3448/euroclin.2024.1 · PMID: 37486338 · cited by 7
  3. Outcomes of Gastroenterology in adults — a multi-centre cohort
    Yiannis Kallis, et al. · European Journal of Medicine, 2023
    DOI: 10.3839/euroclin.2023.2 · PMID: 34585616 · cited by 145

Invited talks

  • Practical updates in Gastroenterology European Annual Congress (Gastroenterology) · Vienna · 2024 · invited
  • Single-centre experience in Gastroenterology National Society Meeting · London · 2023 · oral abstract

Awards & memberships

Awards

  • 🏆 Top-rated Gastroenterology — London · EuroClinics Patient Choice · 2025 · regional
  • 🏆 Excellence in Patient Care · National Society · 2024 · national
  • 🏆 Young Investigator Award · European Society · 2023 · international

Society memberships

  • WONCA Europe — Family Doctors — Member · Since 2028
  • national college of family doctors — Member · Since 2028
  • European Union of Medical Specialists (UEMS) — Member · Since 2028

Articles by this doctor

  • Patient education Patient guide to Gastroenterology 2026-03-01 · 4 min read
  • Awareness When should you see a gastroenterology? 2026-01-09 · 7 min read

For international patients

Coordinator
Patient liaison · dr.yiannis.kallis@euroclinics.example
Accepted international insurance
Allianz Worldwide · AXA Global · BUPA Global · Cigna Global

Location

1 tag

Patient reviews

334 verified reviews
4.93
★★★★⯨
334 reviews
5★ 2
4★ 1
3★ 0
2★ 0
1★ 0
Bedside Manner
5.0
Knowledge
5.0
Wait Time
4.7
Staff Friendliness
5.0
Ease Of Appointment
4.8
Value For Money
4.9
Would Recommend Pct
98.0
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Recent reviews

  • ★★★★★ ✓ Verified
    Very thorough first visit — explained every step. Booking was easy and the staff were welcoming.
    Anna B.
  • ★★★★★ ✓ Verified
    Took time to listen and reviewed all my previous results. I would absolutely recommend.
    Marco V.
  • ★★★★☆ ✓ Verified
    Professional and knowledgeable. Wait on the day was a bit long, otherwise excellent.
    Helena F.

SPECIALTIES & PROCEDURES

Dr Yiannis Kallis's Areas of Specialty

Each specialty below reflects the conditions and procedures Dr Yiannis Kallis treats, with the size of the national pool of United Kingdom doctors offering the same care.

Gastroenterology

Digestive-tract conditions including reflux, IBS, IBD, liver disease and colorectal screening.

Dr Yiannis Kallis is one of 792 gastroenterology doctors indexed in United Kingdom. Browse gastroenterology doctors in United Kingdom →

LOCAL CARE CONTEXT

Why local healthcare in London matters

Medical practice in United Kingdom is governed by country-specific licensing, professional standards, and patient-safety regulations. Practitioners listed here are registered with the relevant United Kingdom medical authority and operate within national rules on scope of practice, prescribing rights, and continuing professional development. Care delivered in London carries the additional benefits of local language support, in-person follow-up, and direct coordination with regional hospitals and labs. A verified profile means EuroClinics has cross-checked the practitioner or clinic against an official source (national medical register, public licence database, or the practitioner themselves), and that the data shown here matches that source as of the last verification date above.

Looking for additional providers? all doctors in London or all doctors in United Kingdom.

Frequently asked questions

Quick answers to the questions patients ask most. The same answers are surfaced to AI assistants via structured data.

  • What does Yiannis Kallis specialise in?

    Yiannis Kallis specialises in Gastroenterology in London, GB. 28 years of clinical experience.

  • What conditions does Yiannis Kallis treat?

    Yiannis Kallis treats conditions within Gastroenterology. View the full conditions-treated list on the profile.

  • Where does Yiannis Kallis practise?

    Yiannis Kallis practises in London, GB. The profile page lists all practice addresses, phone numbers, and clinic affiliations.

  • What languages does Yiannis Kallis speak?

    Yiannis Kallis speaks English.

  • How do I book an appointment with Yiannis Kallis?

    Use the "Request a booking" button on the profile to send an appointment request. Most appointments are confirmed within 24 hours; many slots are bookable instantly.

  • What do patients say about Yiannis Kallis?

    Yiannis Kallis has a verified rating of 4.93/5 from 334 patient reviews. Read the most recent reviews on the profile page.

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