Best Viral Hepatitis C Doctors Worldwide — TOP 15

Dr. Ahmet Melih Ozel is a gastroenterologist at Anadolu Medical Center in Istanbul. He specializes in inflammatory bowel diseases and chronic liver conditions. He performs upper and lower gastrointestinal endoscopies. Dr. Ozel also focuses on pancreatobiliary system diseases. He works at a clinic affiliated with Johns Hopkins Medicine.

• Performs Endoscopic Retrograde Cholangiopancreatography (ERCP).
• Treats complex conditions like Crohn's disease and chronic Hepatitis B.
• Member of the European Society of Gastrointestinal Endoscopy (ESGE).
• Former Dean at Maltepe University Faculty of Medicine.

Dr. Pichai Kittipanyaworakul is a gastroenterologist and hepatologist at Navamin 9 Hospital in Bangkok. He earned his medical degree from Chiang Mai University. Dr. Kittipanyaworakul holds a diploma in gastroenterology and hepatology from Mahidol University, a top-tier Thai institution. He works at a JCI-accredited facility that treats 30,000 patients every year.

• Specializes in treating complex liver conditions like chronic Hepatitis B and C.
• Performs specialized procedures including stomach resection and gastric polyps removal.
• Manages autoimmune digestive disorders, Crohn's disease, and ulcerative colitis.
• Offers diagnostic screenings like gastroscopy with biopsy and transnasal endoscopy.

Dr. Zulfikar Polat is a professor of gastroenterology at Istanbul Aydın University. He previously practiced at Anadolu Medical Center, an affiliate of Johns Hopkins Medicine. Dr. Polat focuses on hepato-pancreatology and inflammatory intestinal diseases. He serves as an expert in both diagnostic and interventional endoscopic procedures.

• Member of prestigious international societies including AASLD, EASL, and ESGE.
• Authored 45 national and international medical publications.
• Treats complex conditions like Crohn's disease, ulcerative colitis, and cirrhosis.
• Performs specialized procedures including gastric polypectomy and duodenal polyp removal.

Specialist in General Surgery | Gastrointestinal Endoscopy

Dr Marcin Olender is a specialist in general surgery with extensive clinical experience in the diagnosis and treatment of surgical and gastrointestinal conditions. At KCM Clinic, he focuses particularly on gastrointestinal endoscopy and provides patients with comprehensive diagnostic examinations of the upper and lower digestive tract.

His clinical practice combines surgical expertise with modern endoscopic diagnostic techniques, allowing patients to receive accurate assessment and appropriate recommendations based on their individual medical needs.

Areas of Expertise

Dr Olender specialises in:

• General surgery
• Gastrointestinal endoscopy
• Gastroscopy
• Colonoscopy
• Colonoscopy with polypectomy
• Diagnosis of diseases of the upper gastrointestinal tract
• Diagnosis of diseases of the lower gastrointestinal tract
• Endoscopic assessment of gastrointestinal symptoms
• Qualification for gastrointestinal endoscopic procedures
• Selected procedures supporting the treatment of obesity

At KCM Clinic, Dr Olender performs both gastroscopy and colonoscopy, including colonoscopy with removal of polyps when medically indicated.

Gastrointestinal Endoscopy

Gastrointestinal endoscopy is an important part of modern diagnosis and prevention of digestive system diseases.

During a gastroscopy, the oesophagus, stomach and duodenum are carefully examined. The procedure can help identify conditions such as inflammation, ulcers, bleeding and other abnormalities.

A colonoscopy allows examination of the large intestine and is an important tool in the diagnosis and prevention of colorectal cancer. When appropriate, polyps can be removed during the same procedure and subsequently sent for histopathological examination.

Dr Olender also performs endoscopic examinations as part of the diagnostic pathway for patients with gastrointestinal symptoms and conditions requiring further investigation.

A Patient-Centred Approach

Dr Olender places particular emphasis on patient safety, careful diagnosis and clear communication.

Before an examination, patients receive information about the procedure and preparation requirements. During the consultation, the patient's symptoms, medical history and individual risk factors are taken into consideration.

The goal is to make the diagnostic process as comfortable, safe and informative as possible while ensuring that patients understand the purpose and results of their examination.

Experience in Bariatric Care

Dr Olender is also a member of the multidisciplinary bariatric team at KCM Clinic. His work in this area includes gastrointestinal diagnostics and selected endoscopic procedures supporting the treatment of obesity, including the placement of a gastric balloon as part of an individually tailored weight-management programme.

Gastrointestinal endoscopy can play an important role in the assessment and preparation of patients undergoing bariatric treatment, helping physicians evaluate the condition of the digestive tract and identify potential medical considerations before treatment.

Your Visit at KCM Clinic

During your appointment, Dr Olender will discuss your symptoms, medical history and the reason for the examination. You will receive information about how to prepare for the procedure, what to expect during the examination and any necessary follow-up.

Our priority is to provide patients with professional medical care, accurate diagnostics and a comfortable experience throughout the entire diagnostic process.

Dr. Cheon Wonseok is Head of Gastroenterology at Na-Eun Hospital. He treats gastrointestinal disorders. He performs upper endoscopy, colonoscopy, polypectomy, and ESD. He manages gastric and esophageal cancer and Helicobacter pylori infection. He also treats liver disease and inflammatory bowel disease, including Crohn’s disease and ulcerative colitis. He offers small-bowel capsule endoscopy.

Accreditations: Board-certified specialist in gastrointestinal endoscopy. Lifetime member, Korean Society of Gastrointestinal Endoscopy. Full member, Korean Association of Internal Medicine.

Training: Kyung Hee University College of Medicine. Internship, Kyung Hee University Medical Center. Residency in internal medicine, Hallym University Sacred Heart Hospital. Clinical fellowship in gastroenterology, Chung-Ang University Hospital.

Dr. Pak Seongjin is a gastroenterologist. He focuses on endoscopy and advanced procedures such as gastroscopy, colonoscopy, polypectomy, and ESD. He also treats digestive and liver diseases, including cirrhosis, pancreatitis, hepatitis, and Helicobacter pylori infection.

He earned his M.D. and M.S. in Internal Medicine from Chung-Ang University. He completed his internal medicine residency and a gastroenterology fellowship at Chung-Ang University Hospital.

He is a clinical professor at Gachon University College of Medicine and Inha University College of Medicine. He is a full member of the Korean Association of Internal Medicine, the Korean Society of Gastrointestinal Endoscopy, the Korean Gastroenterology Association, and the Korean Pancreatobiliary Association.

Dr. Kim Taegyun is a gastroenterologist. He focuses on pancreatobiliary diseases and cancers, including pancreatitis, pancreatic cysts and cancer, cholecystitis, gallstones (cholelithiasis), and biliary tract cancer. He also performs advanced endoscopy, including ERCP. He treats gastrointestinal tumors, stomach and colon polyps, stomach cancer, and submucosal tumors (SMT).

Education and training: MD, Jeonbuk National University College of Medicine. MS in Medicine, University of Ulsan. Internship, Jeonbuk National University Hospital. Residency in Internal Medicine, Veterans Health Service Medical Center. Fellowships in Gastroenterology, Inje University Haeundae Paik Hospital and Asan Medical Center.

Career: Attending physician and specialist at Gwangju Veterans Hospital and the Veterans Health Service Medical Center.

Professor Park Jung-won is a leading Korean specialist in hepatocellular carcinoma with over 30 years of experience. He is the Director of the Liver and Liver Cancer Center and the Integrated Cancer Care Center at Myongji Hospital. He led Korea’s first HCC guidelines in 2003. He has also overseen their updates for about 20 years. His team validated proton beam radiotherapy for liver cancer, as published in the Journal of Hepatology. He has authored more than 200 SCI-indexed papers. He also helped lead global trials, including the 2025 CheckMate 9DW study, which showed improved outcomes with nivolumab plus ipilimumab for unresectable HCC.

MD/PhD, Seoul National University; Member, National Academy of Medicine of Korea; former President, Korean Liver Cancer Association; Chair, Korean HCC Guidelines Committee; Prime Minister’s and Health Minister’s commendations; Pfizer Medical Research Award and Roche Oncology Academic Award.

36 years specializing in liver diseases – Dr. Rossol brings extensive gastroenterology expertise to Hepatitis C treatment at Nordwest Clinic.

• Fellow of the European Board of Gastroenterology
• Member of European and American liver study associations
• Specializes in interventional sonography for liver conditions
• Trained at King's College London liver studies institute

Prof. Dr. İbrahim Doğan is a gastroenterologist. He earned his MD from Ankara University Faculty of Medicine in 1991. He became an Internal Medicine specialist at Gazi University in 1996. He completed gastroenterology subspecialty training at İnönü University in 2001.

His academic career was at Gazi University. He served as Lecturer (2002), Assistant Professor (2003), Associate Professor (2007), and Professor (2012). He worked as a researcher at the University of California San Diego from 2004 to 2006. He has practiced at Koru Hospital since January 2023.

Clinical focus includes gastroesophageal reflux, irritable bowel syndrome, constipation, gastroparesis, achalasia, bloating, gas and belching, fecal incontinence, ulcerative colitis, and Crohn’s disease. He performs ERCP, stent placement, balloon and bougie dilation, polypectomy, argon plasma coagulation, double-balloon enteroscopy, and bleeding control.

Prof. Dr. Musa Aydınlı is an internal medicine specialist and gastroenterologist. He completed his MD at Hacettepe University in 1997. He finished internal medicine training in 2003 and gastroenterology training in 2007 at the same institution. He worked at Kayseri Training and Research Hospital from 2007 to 2009. He served in the Gastroenterology Department at Gaziantep University from 2009 to 2014. He became an associate professor in 2012 and a professor in 2020. He joined Gülhane Training and Research Hospital in 2022. He now practices at Private Koru Ankara Hospital.

Clinical focus: GERD; dyspepsia, gastritis, and Helicobacter pylori; peptic ulcer disease; celiac disease; IBS and IBD (ulcerative colitis, Crohn’s disease); colon polyps; colorectal and upper GI cancers; liver disease (fatty liver, chronic hepatitis, cirrhosis, portal hypertension); hepatobiliary and pancreatic disorders and cancers. Procedures: EGD, rectosigmoidoscopy, and colonoscopy; biopsy, polypectomy, and endoscopic mucosal resection; hemostasis and APC; dilation and stent placement; PEG; ERCP; EUS-guided biopsy.