Mark Pimentel MD

Gastroenterology•Los Angeles, CA

Gastrointestinal Functional & Motility Disorders

Associate Professor, Medicine, UCLA School of Medicine

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8700 Beverly BlvdLos Angeles, CA 90048
Phone+1 310-423-6143
Fax+1 310-423-8356

Education & Training

UCLA David Geffen School of Medicine/UCLA Medical CenterFellowship, Gastroenterology, 1996 - 1999
University of ManitobaClass of 1992

Certifications & Licensure

CA State Medical License 1996 - 2025

Awards, Honors, & Recognition

CMS Meaningful Use Stage 1 Certification EpicCare Ambulatory EMR, Epic Systems Corporation, 2013
Super Doctor SuperDoctors.com

Clinical Trials

Rifaximin for the Treatment of Irritable Bowel Syndrome Start of enrollment: 2003 Jul 01
Completed
Phase 2
Neomycin and Rifaximin Plus Neomycin in Treating Methane Positive Constipation Predominant Irritable Bowel Syndrome Start of enrollment: 2009 Aug 01
Completed
Not Applicable
Pilot of AbStats /AEGIS System for Detecting Motility Abnormalities Start of enrollment: 2013 Jul 01
Completed
Capillary Endoscopy Aspiration Catheter Start of enrollment: 2020 May 20
RECRUITING
NA
Efficacy and Safety of Rifaximin With NAC in IBS-D Start of enrollment: 2020 Nov 13
Completed
Phase 1, Phase 2
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Publications & Presentations

PubMed

Anti-muscarinic 3 antibodies associate with a severe clinical phenotype in patients with systemic sclerosis.
Ali Y Ayla, Naveen R Kalavar, Mark Pimentel, Walter Morales, Laura K Hummers
Rheumatology. 2025-04-12
Small intestinal bacterial overgrowth in chronic liver disease: an updated systematic review and meta-analysis of case-control studies.
Ayesha Shah, Liam Spannenburg, Parag Thite, Mark Morrison, Thomas Fairlie
Eclinicalmedicine. 2025-02-01
Names Matter: A Call to Neurogastroenterologists to Examine How We Can Improve the Nomenclature We Use to Describe the Disorders Our Patients Experience.
Pankaj J Pasricha, Nicholas J Talley, Linda Nguyen, Thomas Abell, John Furness
Gastroenterology. 2025-02-01

Journal Articles

Declining Rates of Referral for Irritable Bowel Syndrome Without Constipation at a Tertiary Care Center
Nipaporn Pichetshote, Vartan C Tashjian, Mark Pimentel, Ali Rezaie, Ruchi Mathur, Digestive Diseases and Sciences

Lectures

Influence of Dietary Restriction on Irritable Bowel Syndrome
Los Angeles, CA - 6/15/2014
Breath Testing
AGC 2018 Annual Scientific Meeting, Philadelphia, PA - 10/8/2018
Case-Based Functional GI Testing: Ask the Experts
AGC 2018 Annual Scientific Meeting, Philadelphia, PA - 10/8/2018

Press Mentions

This Specialized Diet Can Improve Gut Health and Intestinal DisordersApril 16th, 2025
IBS: Understanding a Common yet Misunderstood ConditionNovember 5th, 2024
Diabetes Drugs May Affect Endoscopy PatientsOctober 3rd, 2024
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Professional Memberships

Endocrine Society - ENDO
Member