– GASTROENTEROLOGIST • ENDOSCOPIST • INTERVENTIONALIST

Dr. José Carlos
Marín Gabriel

Scientific Director, ICAdig • Attending Physician, 12 de Octubre University Hospital Clinical Associate Professor, Complutense University of Madrid

Truly personalized care begins by listening to those seeking help and establishing a relationship of mutual trust.

12 de Octubre University Hospital Complutense University of Madrid Training in Kobe, Japan Principal Investigator for international clinical trials International Trainer of Endoscopists G-SEED · AEG · SEED
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– About Me

Scientific rigor with a more human touch.

Dr. Marín Gabriel is an Attending Physician in the Gastroenterology Department at the 12 de Octubre University Hospital in Madrid and an Associate Professor at the Complutense University of Madrid, where he teaches Gastroenterology within Medical Pathology and supervises doctoral theses and undergraduate dissertations.

His area of expertise is advanced therapeutic endoscopy: endoscopic resection of colorectal lesions (EMR/UEMR), endoscopic submucosal dissection (ESD) —with specialized training at Kobe Hospital, Japan, supported by an ISCIII fellowship— peroral endoscopic myotomy (POEM), optical diagnosis with chromoendoscopy and NBI, esophageal stenting, and direct peroral cholangioscopy. He is also an international trainer in these advanced endoscopic techniques.

At ICAdig, Dr. Marín Gabriel focuses specifically on high-risk consultations: hereditary colorectal cancer syndromes, personalized screening, polyposis, and early-stage neoplasms. In his daily clinical practice, a significant portion of his patients consult for functional pathology, neurogastroenterology, and motility.

His career includes participation in the World Gastroenterology Organization and leadership roles in the Spanish Gastroenterology Association, where he has served on the Board of Directors as Vice President.

"Truly personalized care begins by listening to the person seeking help and establishing a relationship of mutual trust, without which it is impossible to achieve the desired clinical outcomes. Focusing on the details and maintaining scientific rigor are two fundamental elements that define my vision of medicine."

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H. U. 12 de Octubre

Attending Physician · Gastroenterology Department
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Complutense University

Associate Professor · Medical School
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ICAdig — Co-founder

Scientific Director · 10 Juan Bravo St, Madrid
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International Training

Kobe Hospital, Japan · ESD · ISCIII Fellowship
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World Gastroenterology Organization

Member · Leading Global Organization
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Spanish Gastroenterology Association

Former Vice President of the Board of Directors
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European Society of Gastrointestinal Endoscopy

Member · European Endoscopy Society
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Media & Outreach

Contributor to EFEsalud, SER, and El País
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Scientific Groups

G-SEED (Endoscopic Resection) · SEED · AEG · ESGE

– Research and publications

Science that transforms clinical practice

Recent featured publications

Endoscopy

DEBE Score — delayed bleeding after colorectal ESD
2026

Endoscopy

ARMA trial — anti-reflux mucosal ablation vs. sham for GERD
2026
The Lancet
COLONPREV — colonoscopy vs. FIT in CRC screening, non-inferiority
2025
Gastroent. Hepatol.
National registry of esophageal ESD in Spain
2024
Main project
ESD vs. EMR in colorectal lesions — multicenter RCT
Multicenter non-inferiority randomized clinical trial for which Dr. Marín Gabriel serves as Principal Investigator. Former Secretary of the SEED G-SEED Endoscopic Resection Group and Member of the Scientific Committee.
Research lines
Optical diagnosis and endoscopic therapeutics
Resection of colorectal lesions, gastric and esophageal ESD in Western populations, advanced endoscopy for gastric premalignant lesions, and endoscopic complications.
Teaching
UCM, H12O, and specialized training
Digestive System in Medical Pathology (4th year Medicine, UCM). Approximately 5 Undergraduate Dissertations (TFG) and 3 doctoral theses supervised. Chapters in the treatise on advanced digestive endoscopy (Ed. Médica Panamericana, 2025). Coordinator of the Master’s and Certificate of Advanced Studies in Emergencies in Gastroenterology and Hepatology.
G-SEED SEED AEG ESGE EndoAula
Awards and grants
Competitive grants in biomedical research
Recruitment of research grants awarded by leading national and international scientific societies: AEG (Spanish Association of Gastroenterology), SEED (Spanish Society of Digestive Endoscopy), and ESGE (European Society of Gastrointestinal Endoscopy).
AEG SEED ESGE

Focusing on detail and maintaining scientific rigor are two fundamental elements that define my vision of medicine.

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– Research and publications

What our patients say

“I recently visited the clinic for a digestive system check-up with Dr. Matallana. I have never been treated so well or with such professionalism. She explained every single test in detail, using language that anyone could understand. Without a doubt, I recommend that if you have any issues related to the digestive system, you come here and ask for Dr. Matallana. Thank you very much, Doctor, for everything. Best regards.” -Emilio

“The care I received was excellent, both personally and professionally. Dr. Díaz Tasende is magnificent due to his knowledge, experience, approachability, and problem-solving skills. The institute’s team has shown, on every occasion, the empathy, understanding, and attention that you need as a patient. Both the video call system and the exchange of documentation work very well and allow for efficient progress. Thank you very much!!!” -Lluis

“I took my baby for a consultation with Dr. Galicia, a pediatric gastroenterologist, and it was truly an excellent experience. From the very first moment, the doctor showed a human warmth and professionalism that gave us a great deal of confidence. He took the necessary time to listen to us, evaluate our baby with great gentleness, and explain everything in a clear and understandable way. It is clear that he has great experience and vocation, but above all, that he genuinely cares about the well-being of his patients.” -Paola

“ICAdig is a unique and exclusive clinic with exceptional administrative staff and doctors. At the reception, the staff resolves any paperwork issues with exquisite and friendly service. In the consultation, the doctors are highly professional, demonstrate excellent empathy, and inspire great confidence; you leave the appointment with your questions answered and a solution to whatever the problem may be. My experience in consultations with Dr. José Carlos Marín has been second to none.” -Denis

“A 10/10 for Dr. Fresneda: we spent nearly an hour with her in the consultation without ever feeling like she was rushing us—quite the opposite. She didn’t stop asking questions until she fully understood the medical history and the details of my mother’s digestive issues. Now that healthcare in this country is going down the drain, this center seems like an excellent alternative.” -Jorge

“Dr. Diana Fresneda is an exceptional professional: approachable, clear, and deeply empathetic. She explains every step with a clarity that conveys confidence, and she has the delicacy to always do so through listening and respect.” -Lucia

“Every time I have visited ICAdig, I have received fantastic care. In my specific case, the treatment from Dr. Matallana has been excellent. She knows how to listen and engage with the patient, study their issues, and work toward an accurate diagnosis and appropriate treatment plan. She even facilitates testing at centers outside of ICAdig whenever possible. I am very grateful for that. Without a doubt, a highly recommended medical center for digestive specialties.” -Nestor

“Every aspect is exceptionally optimal from the start. The receptionists, Carolina and Silvia, provide information in a charming manner. The medical professionals are magnificently qualified, have a kind demeanor, and dedicate all the necessary time to the patient without the slightest rush. Thanks to Dr. Díaz Tasende, after being ill for months and having been treated by two previous specialists, I regained my health. Totally recommended. Thank you for your care!” -Maria

– Specialties

Clinical areas of care at ICAdig

General Gastroenterology

Gastroesophageal reflux, gastritis, ulcers, altered bowel habits, and general digestive pathology.

Inflammatory Bowel Diseases

Crohn's disease, ulcerative colitis, and other forms of inflammatory bowel disease.

Functional and Motility Disorders

Functional dyspepsia, irritable bowel, abdominal bloating, constipation, and functional abdominal pain.

Liver Diseases

Viral hepatitis, toxic and metabolic diseases, autoimmune diseases, and liver tumors.

Pancreatic and Biliary Diseases

Gallbladder diseases, acute and chronic pancreatitis, pancreatic tumors, ERCP, and cholangioscopy.

Advanced Endoscopy

ESD, EMR/UEMR, POEM, chromoendoscopy, NBI, esophageal stents, and direct peroral cholangioscopy.

Digestive Cancer Prevention

Individualized screening, hereditary and familial CRC syndromes, polyposis, and early neoplasia.

Pediatric Gastroenterology

Digestive pathology in pediatric age. Specialized assessment and follow-up by pediatric gastroenterologists.

– Icadig

The Clinical Institute of the Digestive System

“At the Clinical Institute of the Digestive System, we know that every person has unique needs. You will find the high-quality time necessary to understand your problem and find the solutions you need, from the first visit to periodic check-ups.

We do not work directly with insurance companies —except for reimbursement policies— which allows us to dedicate the time and attention to each consultation that it deserves, without external constraints.

We offer both in-person consultations at our center in the Barrio de Salamanca and video consultations for patients throughout Spain and abroad, with the same standard of clinical excellence.”

• Continuous quality improvement
Committed to excellence and innovation to exceed every patient’s expectations.
• Teamwork
Regular consultations between specialists to share knowledge, allowing for the resolution of every case.
• Adequate consultation times
Schedule adapted to the real needs of each patient, without rushing.
• Based on scientific evidence
Clinical protocols backed by international reference clinical practice guidelines.
• Secure digital medical records
Intuitive and secure platform to centralize your medical information with ease and confidence.

– Consultations and prices

In-person care and video consultation

IN-PERSON CONSULTATION

Barrio de Salamanca Center

Ideal modality for initial assessment and when a complete physical examination is necessary. Our center is located at C/ Juan Bravo 10, in the heart of the Barrio de Salamanca in Madrid.
First consultation
140€ / session
Follow-up consultation
120€ / session
VIDEO CONSULTATION

From anywhere

Excellent alternative for follow-up and evaluation of complementary tests. The most requested option for a second opinion for patients who do not reside in Madrid. Same quality, without the commute.
First consultation
110€ / session
Follow-up consultation
80€ / session
ICAdig does not work directly with insurance companies. If you have a reimbursement policy, we issue detailed invoices valid for recovering the full or partial amount of the consultation fee.

– Frequently asked questions

Your questions, answered

When should I see a digestive specialist?
If you experience symptoms such as frequent heartburn, abdominal pain, heavy digestion, persistent diarrhea or constipation, changes in bowel habits, difficulty swallowing, or blood in the stool, it is advisable to consult a specialist for an accurate evaluation. Do not wait for symptoms to become chronic.
The video consultation has an identical structure to an in-person visit for everything that does not require a physical examination. It is especially useful for follow-ups, reviewing test results, and second opinions. For an initial assessment where a physical examination is necessary, we recommend an in-person consultation.
ICAdig does not work directly with insurance companies, which allows us to dedicate the necessary time to each consultation. If you have a reimbursement policy, we issue detailed invoices valid for recovering the full or partial amount of the consultation fee.
Endoscopic procedures are performed at HM Sanchinarro Hospital, with all the necessary technical and safety guarantees. The initial consultation and assessment take place at our center at C/ Juan Bravo 10.
You can request your appointment through the online form at icadig.com, by calling +34 659 34 00 20, or by emailing icadig@icadig.com. Our team will guide you to the most appropriate specialist and confirm the date and time.

ICAdig

Book your appointment or ask us

In-person consultations at C/ Juan Bravo 10, Barrio de Salamanca, Madrid.

Video consultations available for all of Spain and abroad.

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Watch Dr. Marín's video