Lukejohn Day, MD
VP, UCSF Health System CMO
Office of the CEO
Chancellor/EVC/FAS

In his role at UCSF Health, he is the key physician leader for developing and implementing medical care policies throughout UCSF Health, ensuring standardization of medical care practices and procedures across the health system, and enhancing the interactions between inpatient and outpatient services. He is a practicing gastroenterologist and a Professor of Medicine at the University of California, San Francisco School of Medicine. His research interests have focused on developing and implementing efficiency models for improving healthcare delivery and quality in large healthcare systems. Additionally, he has performed impactful and influential research to understand drivers of efficiency and quality for performing endoscopic procedures.

He is a member of the Oglala Lakota Nation in South Dakota. He is serving a two-year term as the President of the Association of American Indian Physicians (AAIP) and has been an AAIP governing board member for over a decade. He has published extensively on colorectal cancer screening disparities that exist for American Indians/Alaskan Natives, as well as on strategies for how to increase the representation of American Indian/Alaskan Native physicians in healthcare, especially within gastroenterology.

• Health Advocacy, Policy, and Legislation for Gastroenterology Practices.
  Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association 2023 Khan NM, Hennessy B, Lajin M, Qazi H, Day L
• The AGA Equity Project: Where We Are, and Where We Go From Here.
  Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association 2022 Quezada SM, Carethers JM, Abreu M, Hendersen W, Omary MB, Cryer B, Equity Project Advisory Board
• Bridging the Racial, Ethnic, and Gender Gap in Gastroenterology.
  Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association 2022 Cryer B, Quezada S, Culpepper-Morgan JA, Day L, Kaul V, NuQuay C, Omary MB
• Bridging the Racial, Ethnic, and Gender Gap in Gastroenterology.
  Gastroenterology 2022 Cryer B, Quezada S, Culpepper-Morgan JA, Day L, Kaul V, NuQuay C, Omary MB
• Endoscopic approach to eosinophilic esophagitis: American Society for Gastrointestinal Endoscopy Consensus Conference.
  Gastrointestinal endoscopy 2022 Aceves SS, Alexander JA, Baron TH, Bredenoord AJ, Day L, Dellon ES, Falk GW, Furuta GT, Gonsalves N, Hirano I, Konda VJA, Lucendo AJ, Moawad F, Peterson KA, Putnam PE, Richter J, Schoepfer AM, …
• In-hospital Substance Use Policies: An Opportunity to Advance Equity, Reduce Stigma, and Offer Evidence-based Addiction Care.
  Journal of addiction medicine 2022 Martin M, Snyder HR, Otway G, Holpit L, Day LW, Seidman D
• Interventions to improve adenoma detection rates for colonoscopy.
  Gastrointestinal endoscopy 2022 Shaukat A, Tuskey A, Rao VL, Dominitz JA, Murad MH, Keswani RN, Bazerbachi F, Day LW, (ASGE Quality Assurance in Endoscopy Committee Chair)
• Interventions to improve the performance of upper GI endoscopy quality indicators.
  Gastrointestinal endoscopy 2022 Bazerbachi F, Panganamamula K, Nieto JM, Murad MH, Keswani RN, Shaukat A, Day LW
• GI endoscope reprocessing: a comparative review of organizational guidelines and guide for endoscopy units and regulatory agencies.
  Gastrointestinal endoscopy 2022 ASGE QUALITY ASSURANCE IN ENDOSCOPY COMMITTEE, Taunk P, Shimpi R, Singh R, Collins J, Muthusamy VR, Day LW
• Patient Experience in the Gastrointestinal Endoscopy Unit.
  Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association 2021 Day LW, Savides TJ
• American Society for Gastrointestinal Endoscopy radiation and fluoroscopy safety in GI endoscopy.
  Gastrointestinal endoscopy 2021 Kwok K, Hasan N, Duloy A, Murad F, Nieto J, Day LW
• Concentrating Vaccines in Neighborhoods with High Covid-19 Burden
  NEJM Catal Innov Care Deliv. 2021 Stern RJ, Rafferty HF, Robert AC, Taniguchi C, Gregory B, MD, Khoong EC, Handley MA, Day LW, and Chen E.
• AGA Clinical Practice Guidelines on Intragastric Balloons in the Management of Obesity.
  Gastroenterology 2021 Muniraj T, Day LW, Teigen LM, Ho EY, Sultan S, Davitkov P, Shah R, Murad MH
• Multisociety guideline on reprocessing flexible GI endoscopes and accessories.
  Gastrointestinal endoscopy 2021 Day LW, Muthusamy VR, Collins J, Kushnir VM, Sawhney MS, Thosani NC, Wani S
• American Society for Gastrointestinal Endoscopy Infection Control Summit: updates, challenges, and the future of infection control in GI endoscopy.
  Gastrointestinal endoscopy 2020 Day LW, Kwok K, Visrodia K, Petersen BT
• Effect of individualized feedback on learning curves in EGD and colonoscopy: a cluster randomized controlled trial.
  Gastrointestinal endoscopy 2019 Han S, Obuch JC, Keswani RN, Hall M, Patel SG, Menard-Katcher P, Simon V, Ezekwe E, Aagaard E, Ahmad A, Alghamdi S, Austin K, Brimhall B, Broy C, Carlin L, Cooley M, Di Palma JA, Duloy AM, Early DS, …
• Diversity Within US Gastroenterology Physician Practices: The Pipeline, Cultural Competencies, and Gastroenterology Societies Approaches.
  Gastroenterology 2018 Carethers JM, Quezada SM, Carr RM, Day LW
• Yield of Colonoscopy After a Positive Result From a Fecal Immunochemical Test OC-Light.
  Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association 2018 Alsayid M, Singh MH, Issaka R, Laleau V, Day L, Lee J, Allison J, Somsouk M
• ASGE guideline for infection control during GI endoscopy.
  Gastrointestinal endoscopy 2018 ASGE Quality Assurance in Endoscopy Committee, Calderwood AH, Day LW, Muthusamy VR, Collins J, Hambrick RD, Brock AS, Guda NM, Buscaglia JM, Petersen BT, Buttar NS, Khanna LG, Kushnir VM, Repaka A, …
• Gastroenterologist and primary care perspectives on a post-endoscopy discharge policy: impact on clinic wait times, provider satisfaction and provider workload.
  BMC health services research 2018 Selvig D, Sewell JL, Tuot DS, Day LW
• Missed Opportunities in Colorectal Cancer Prevention in Patients With Inadequate Bowel Preparations.
  Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association 2018 Issaka RB, Singh MH, Rachocki C, Day LW, Horton C, Somsouk M
• Assessment of quality indicators among nurse practitioners performing upper endoscopy.
  Endoscopy international open 2017 Baumgardner JM, Sewell JL, Day LW
• Quality indicators for gastrointestinal endoscopy units.
  VideoGIE : an official video journal of the American Society for Gastrointestinal Endoscopy 2017 ASGE Endoscopy Unit Quality Indicator Taskforce, Day LW, Cohen J, Greenwald D, Petersen BT, Schlossberg NS, Vicari JJ, Calderwood AH, Chapman FJ, Cohen LB, Eisen G, Gerstenberger PD, Hambrick RD, …
• Urgent colonoscopy in patients with lower GI bleeding: a systematic review and meta-analysis.
  Gastrointestinal endoscopy 2017 Kouanda AM, Somsouk M, Sewell JL, Day LW
• Endoscopic ultrasound-guided biliary access versus precut papillotomy in patients with failed biliary cannulation: a retrospective study.
  Endoscopy 2017 Lee A, Aditi A, Bhat YM, Binmoeller KF, Hamerski C, Sendino O, Kane S, Cello JP, Day LW, Mohamadnejad M, Muthusamy VR, Watson R, Klapman JB, Komanduri S, Wani S, Shah JN
• Inadequate Utilization of Diagnostic Colonoscopy Following Abnormal FIT Results in an Integrated Safety-Net System.
  The American journal of gastroenterology 2016 Issaka RB, Singh MH, Oshima SM, Laleau VJ, Rachocki CD, Chen EH, Day LW, Sarkar U, Somsouk M
• Using Search Engine Query Data to Explore the Epidemiology of Common Gastrointestinal Symptoms.
  Digestive diseases and sciences 2016 Hassid BG, Day LW, Awad MA, Sewell JL, Osterberg EC, Breyer BN
• Successful implementation of Lynch syndrome screening in a safety net institution.
  Journal of community genetics 2016 Kidambi TD, Lee R, Terdiman JP, Day L
• Diversity in gastroenterology in the United States: Where are we now? Where should we go?
  Gastrointestinal endoscopy 2016 ASGE Membership and Diversity Committee, Day LW, Gonzalez S, Ladd AM, Bucobo JC, Pickett-Blakely O, Tilara A, Christie J
• Prevalence and predictors of patient no-shows to outpatient endoscopic procedures scheduled with anesthesia.
  BMC gastroenterology 2015 Chang JT, Sewell JL, Day LW
• Studying and Incorporating Efficiency into Gastrointestinal Endoscopy Centers.
  Gastroenterology research and practice 2015 Day LW, Belson D
• Practice variation in PEG tube placement: trends and predictors among providers in the United States.
  Gastrointestinal endoscopy 2015 Day LW, Nazareth M, Sewell JL, Williams JL, Lieberman DA
• Colorectal cancer screening and surveillance in the elderly: updates and controversies.
  Gut and liver 2015 Day LW, Velayos F
• Nonphysician Performance of Endoscopy.
  Gastroenterology & hepatology 2015 Day LW
• Preconsultation exchange in the United States: use, awareness, and attitudes.
  The American journal of managed care 2014 Sewell JL, Telischak KS, Day LW, Kirschner N, Weissman A
• Preconsultation exchange in the United States: use, awareness, and attitudes.
  The American journal of managed care 2014 Sewell JL, Telischak KS, Day LW, Kirschner N, Weissman A
• Increasing access to specialty care: patient discharges from a gastroenterology clinic.
  The American journal of managed care 2014 Tuot DS, Sewell JL, Day L, Leeds K, Chen AH
• Colorectal cancer of the elderly.
  Current treatment options in gastroenterology 2014 Day LW, Velayos F
• Optimizing efficiency and operations at a California safety-net endoscopy center: a modeling and simulation approach.
  Gastrointestinal endoscopy 2014 Day LW, Belson D, Dessouky M, Hawkins C, Hogan M
• Challenges and possible solutions to colorectal cancer screening for the underserved.
  Journal of the National Cancer Institute 2014 Gupta S, Sussman DA, Doubeni CA, Anderson DS, Day L, Deshpande AR, Elmunzer BJ, Laiyemo AO, Mendez J, Somsouk M, Allison J, Bhuket T, Geng Z, Green BB, Itzkowitz SH, Martinez ME
• Non-physician performance of lower and upper endoscopy: a systematic review and meta-analysis.
  Endoscopy 2014 Day LW, Siao D, Inadomi JM, Somsouk M
• Adverse events in older patients undergoing ERCP: a systematic review and meta-analysis.
  Endoscopy international open 2014 Day LW, Lin L, Somsouk M
• Assessment of delivery methods used in the informed consent process at a safety-net hospital.
  Gastrointestinal endoscopy 2014 Siao D, Sewell JL, Day LW
• Colorectal cancer and the elderly.
  Clinics in geriatric medicine 2014 Day LW, Velayos F
• Guidelines for safety in the gastrointestinal endoscopy unit.
  Gastrointestinal endoscopy 2014 ASGE Ensuring Safety in the Gastrointestinal Endoscopy Unit Task Force, Calderwood AH, Chapman FJ, Cohen J, Cohen LB, Collins J, Day LW, Early DS
• Adverse events in older patients undergoing ERCP: a systematic review and meta-analysis
  Endoscopy International Open 2014 Day LW, Lin L, Somsouk M
• Commentary: Towards an effective and safe treatment of small intestine bacterial overgrowth - Authors' reply.
  Alimentary pharmacology & therapeutics 2013 Sewell JL, Somsouk M, Shah SC, Day LW
• FIT testing: an overview.
  Current gastroenterology reports 2013 Day LW, Bhuket T, Allison J
• Meta-analysis: antibiotic therapy for small intestinal bacterial overgrowth.
  Alimentary pharmacology & therapeutics 2013 Shah SC, Day LW, Somsouk M, Sewell JL
• A brief, low-cost intervention improves the quality of ambulatory gastroenterology consultation notes.
  The American journal of medicine 2013 Sewell JL, Day LW, Tuot DS, Alvarez R, Yu A, Chen AH
• Diversity of endoscopy center operations and practice variation across California's safety-net hospital system: a statewide survey.
  BMC research notes 2013 Day LW, Bhuket T, Inadomi JM, Yee HF
• Open Journal of Gastroenterology
  Patient preferences and factors related to the pre-procedure process at a large, urban county hospital 2013 Day LW, Michelle N, Sewell JL
• A rare presentation of abdominal pain: idiopathic mesenteric phlebosclerosis.
  The American journal of gastroenterology 2012 Siao D, Thoeni R, Grenert JP, Day LW
• Adverse events in older patients undergoing colonoscopy: a systematic review and meta-analysis.
  Gastrointestinal endoscopy 2011 Day LW, Kwon A, Inadomi JM, Walter LC, Somsouk M
• Prevalence of gastric cancer versus colorectal cancer in Asians with a positive fecal occult blood test.
  Indian journal of gastroenterology : official journal of the Indian Society of Gastroenterology 2011 Day LW, Cello JP, Somsouk M, Inadomi JM
• Colorectal cancer screening and surveillance in the elderly patient.
  The American journal of gastroenterology 2011 Day LW, Walter LC, Velayos F
• Screening prevalence and incidence of colorectal cancer among American Indian/Alaskan natives in the Indian Health Service.
  Digestive diseases and sciences 2011 Day LW, Espey DK, Madden E, Segal M, Terdiman JP
• Prospective assessment of inpatient gastrointestinal consultation requests in an academic teaching hospital.
  The American journal of gastroenterology 2010 Day LW, Cello JP, Madden E, Segal M
• Idiopathic AIDS enteropathy and treatment of gastrointestinal opportunistic pathogens.
  Gastroenterology 2009 Cello JP, Day LW