J. Fernando del Rosario, MD


Primary Office

Nemours Children's Hospital, Delaware Nemours Children's Hospital, Delaware 1600 Rockland Road Wilmington, DE 19803 Appointment: (800) 416-4441

Other Offices

Get to Know Me

My father was a doctor, and I wanted to be one too. I focus not only on treating children who are sick, but also on improving the quality of the care we provide for them. I’m married with two sons; at age 50 I earned a black-belt in Aikido, and I also enjoy horseback riding, ballroom dancing, art, and other activities.

Why I Treat Children

I have an easy rapport with kids, and enjoy working with them to treat inflammatory bowel disease and other gastrointestinal (GI) problems. I also participate in ImproveCareNow, a national project to improve the quality of GI care for children.

Education & Training


  • Pediatric Gastroenterology - Children's Hospital of Pittsburgh, 1995


  • Transitional Internship - Mount Sinai Hospital, 1990


  • Pediatrics - Dayton Children's Hospital, 1991

Medical/Dental School

  • MD - UERM College of Medicine, 1986

Board Certifications

  • American Board of Pediatrics/Pediatric Gastroenterology

Awards & Recognition

  • 2015 SJ Magazine's Top Docs for Kids
  • 2014 Delaware Today magazine, Top Doctors
  • 2017 Top Doc, Philadelphia Magazine
  • 2017 Best in Medicine Award, American Health Council
  • 2017 Castle Connolly Regional (Wilmington) Top Doc, Castle Connolly Medical LTD
  • 2016 Top Doc, SJ Magazine
  • 2016 Nominated as one of the most honored Professionals, American Registry
  • 2016 Castle Connolly Regional Top Doc, Castle Connolly Medical LTD
  • 2016 Top Doc, Delaware Today,
  • 2013 Certificate of Appreciation for 99% Top Box Press Ganey Score
  • 2014 Top Doc, International Association of Healthcare Professionals
  • 2014 Castle Connolly Regional Top Doc, Castle Connolly Medical LTD.
  • 2013 Vitals Compassionate Doctor Award, Castle Connolly Medical LTD.
  • 2012 Top Doc, Delaware Today
  • 2004 Top Doc, Main Line Magazine
  • 2014 Certificate of Appreciation for 99% Top Box Press Ganey Score
  • 2015 Certificate of Appreciation for 99% Top Box Press Ganey Score

Insurance Accepted

  • Aetna Better Health PA Kids HMO
  • Aetna HMO
  • Aetna PPO/EPO/POS
  • Aetna PPO/POS/EPO
  • Amerihealth Caritas Delaware
  • Amerihealth Caritas Delaware NJ
  • Blue Cross and Blue Shield HMO
  • Blue Cross and Blue Shield Non HMO
  • Blue Cross Blue Shield Florida Blue Select
  • Carefirst MD Community Health Plan Mcaid
  • Cigna & Great West HMO/POS Open Access
  • Cigna & Great West HMO/POS/EPO
  • Cigna & Great West PPO
  • Cigna & Great West PPO/EPO
  • Cigna/Great West HMO EPO POS
  • Cigna/Great West PPO
  • Delaware First Health
  • Delaware Medicaid/Diamond State
  • Delaware Medicare
  • Devon Health Services
  • Fidelis Care NJ Medicaid HMO
  • First Health Aetna PPO/EPO
  • First Health PPO
  • First Health/Affordable PPO
  • Geisinger Health Plan Commercial
  • Global Medical Managment DE/PA
  • Global Medical Mangment NJ
  • Health Partners Medicaid/Kidz Partner HMO
  • HealthSmart Health Plans PPO
  • Highmark Blue Cross Blue Shield of Delaware
  • Highmark Blue Cross Blue Shield of Delaware *PA Loc Contiguous to DE*
  • Highmark Blue Cross Blue Shield of Delaware *PA Loc NONContiguous to DE*
  • Highmark Blue Cross Blue Shield of Pennsylvania
  • Highmark Medicaid Health Options
  • Horizon Blue Cross Blue Shield of New Jersey
  • Humana HMO/POS
  • Humana PPO/EPO
  • Independance Blue Cross/Amerihealth/Keystone Health Plan
  • Insurance Administrators of America
  • INTEGRA Administrative Group (ClaimsBridge)
  • Keystone First Medicaid HMO
  • Lifetrac Transplant
  • Maryland Medicaid
  • Multiplan PPO
  • New Jersey Medicaid
  • Olympus Managed Healthcare PPO NJ
  • Pennsylvania Medicaid
  • Plan Vista/NPPN PPO
  • Preferred Healthcare PPO
  • Prime Health Services PPO Specialty Florida
  • Private Health Care Systems (PHCS)
  • Private Healthcare Systems (PHCS)
  • Qualcare HMO/POS/PPO
  • Star Healthcare Network
  • Star Healthcare Network
  • Three Rivers Provider Network
  • Tricare/Humana Military Health Services/CHAMPVA
  • United Healthcare of the Mid-Atlantic
  • UPMC Medicaid
  • US Family Health Plan
  • Wellpoint Maryland Medcaid

  • Celiac Disease
  • Eosinophilic Esophagitis
  • Feeding Disorders
  • Inflammatory Bowel Disease

Medical Interests

  • Inflammatory bowel disease
  • Quality improvement initiatives

  • Influence of Age and Type 1 Diabetes Mellitus on Serological Test for Celiac Disease in Children; Pediatric Gastroenterology, Hepatology & Nutrition; (2021).

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  • Development and testing of a new simplified endoscopic mucosal assessment for Crohn's disease: The SEMA-CD; Inflammatory Bowel Diseases; (2020).

  • Use of Electronic Health Record Tools to Facilitate and Audit Infliximab Prescribing.; The journal of pediatric pharmacology and therapeutics : JPPT : the official journal of PPAG; (2018).

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  • Gastrostomy and Jejunostomy Feedings in Children with Cerebral Palsy; Cerebral Palsy; (2018).

  • Pathogen- and Microbial- associated Molecular Patterns (PAMPs/MAMPs) and the Innate Immune Response in Crohn's Disease; Inflammation and Immunity in Health and Disease: Emerging Roles of Nutraceuticals and Functional Foods in Immune Support. Chapter 14; (2017).

  • Provider Communication Regarding Psychosocial Factors Predicts Pain Beliefs in Parent and Child.; Journal of developmental and behavioral pediatrics : JDBP; (2016).

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  • Safety of Secretin Administration in Children; Pancreas; (2016).

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  • Exposure to gastric acid-suppression therapy is associated with healthcare-associated and community-associated C. difficile infection in children; jpgn; (2015).

  • Effectiveness of anti-TNFα for Crohn disease: research in a pediatric learning health system.; Pediatrics; (2014).

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  • Improved outcomes in a quality improvement collaborative for pediatric inflammatory bowel disease.; Pediatrics; (2012).

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  • ImproveCareNow: The development of a pediatric inflammatory bowel disease improvement network.; Inflammatory bowel diseases; (2011).

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  • Prevalence and epidemiology of overweight and obesity in children with inflammatory bowel disease.; Inflammatory bowel diseases; (2010).

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  • Inflammatory Bowel Disease; Textbook of Pediatric Gastroenterology, Hepatology and Nutrition. Chapter 32; (2009).

  • Early Immunomodulator Use Improves 18 Month Outcomes in Pediatric Crohn Disease; Inflammatory Bowel Disease; (2008).

  • Laboratory Values of Children Newly Diagnosed With Inflammatory Bowel Disease; Pediatrics; (2007).

  • The Natural History of Corticosteroid Therapy for Ulcerative Colitis in Children; Clinical Gastroenterology and Hepatology; (2006).

  • Corticosteroid Therapy in the Age of Infliximab: Acute and 1-Year Outcomes in Newly Diagnosed Children With Crohn's Disease; Clinical Gastroenterology and Hepatology; (2006).

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  • Health-related quality of life in the first year after a diagnosis of pediatric inflammatory bowel disease; Inflammatory Bowel Diseases; (2006).

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  • Alpha-1-Antitrypsin Deficiency; Five Minute Pediatric Consult; (2005).

  • Congenital Hepatic Fibrosis; Five Minute Pediatric Consult, 4th edition; (2005).

  • Evaluation of the pediatric Crohn disease activity index: A prospective multicenter experience; Journal of Pediatric Gastroenterology and Nutrition; (2005).

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  • Jaundice; Five Minute Pediatric Consult; (2005).

  • . Characterization of height and weight patterns in newly diagnosed children with Inflammatory Bowel Disease (IBD); JPGN; (2004).

  • Patterns of complementary and alternative medicine use in a population of pediatric patients with inflammatory bowel disease; inflammatory bowel disease; (2004).

  • Poor imaging techniques produces poor results: again!; Journal of Pediatrics; (2000).

  • Achalasia and other motor disorders; Pediatric Gastrointestinal Disease: pathophysiology, diagnosis & management, 2nd edition; (1999).

  • Assessment of terminal ileal and colonic inflammation in children with Crohn's disease with Tc-99m labelled WBC; Acta Paeditrica; (1999).

  • Gastroesophageal Reflux; Recent Advances in Pediatrics, Issue 17; (1999).

  • Pediatric inflammatory bowel disease: assessment with scintigraphy with 99mTc-white blood cells; Radiology; (1999).

  • Comparison of the sensitivity of early versus delayed imaging with Tc- 99m HMPAO WBC in children with inflammatory bowel disease; Clinical Nuclear Medicine; (1998).

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  • Distribution of acute bowel inflammation determined by technetium-labeled white blood cells in children with inflammatory bowel disease.; Inflammatory bowel diseases; (1998).

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  • Stool withholding masquerading as seizure disorder.; Clinical pediatrics; (1998).

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  • Accuracy and limitations of 3-D imaging of inflammatory bowel disease with WBC-Tc99m; Pediatric Radiology; (1998).

  • Characterization of late abdominal accumulation of 99tcm-hmpao leukocytes in a large population of children; Nuclear Medicine Communications; (1998).

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  • Common pediatric esophageal disorders; Gastroenterologist; (1998).

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  • Endoscopies in pediatric small intestinal transplant recipients: Five years experience; American Journal of Gastroenterology; (1998).

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  • 3-D imaging of inflammatory bowel disease with WBC-Tc99m; European Journal of Nuclear Medicine; (1998).

  • Duplication cyst of the pancreatic duct presenting as pancreatitis; Gastrointestinal Endoscopy; (1998).

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  • Retrospective analysis of alternate-day prednisone maintenance therapy for Crohn's disease.; Clinical pediatrics; (1998).

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  • Influence of ERCP on the diagnosis and treatment of pediatric patients with symptomatic pancreatitis and cystic fibrosis: Series of case reports; Gastrointestinal Endoscopy; (1998).

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  • Use of technetium-tagged white blood cells in patients with Crohn's disease and ulcerative colitis: Is differential diagnosis possible?; Pediatric Radiology; (1998).

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  • Three-dimensional imaging with WBC-Tc99m in the assessment of inflammation in children with inflammatory bowel disease; Am J Roentgenology; (1998).

  • Sensitivity and specificity of Technetium-labelled white blood cells in pediatric inflammatory bowel disease; European Journal of Medicine ; (1997).

  • Assessment of bowel inflammation with Tc-99m-HMPAO-White Blood Cells versus colonoscopy and biopsy; J Nuc Med ; (1997).

  • Colonoscopy versus Technetium-labelled white blood cells in patients with Crohn's disease; European Journal of Nuclear Medicine ; (1997).

  • Differentiation between continuous and discontinuous colitis with white blood cells labeled with technetium in children; Gastrointestinal Endoscopy; (1997).

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  • Evaluation and management of gastroesophageal reflux and pulmonary disease; Current Opinion in Pediatrics ; (1996).

  • Familial failure of hepatitis B immunization; Journal of Pediatric Gastroenterology and Nutrition; (1996).

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  • Chronic pancreatitis in a patient with cystic fibrosis and clinical pancreatic insufficiency; The Journal of Pediatrics; (1995).

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  • Thrombotic Complications in Pediatric Inflammatory Bowel Disease; Clinical Pediatrics; (1994).

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  • 11p deletions and breakpoints in squamous cell carcinoma: association with altered reactivity with the UM-E7 antibody; Genes, Chromosomes and Cancer; (1991).

  • UM-EC-1, a new receptor (+), hypodiploid human cell line derived from poorly differentiated endometrial cancer; Cancer Research; (1988).

  • English