3 Best Gastroenterologists in Oxnard, CA

Expert-recommended Top 3 Gastroenterologists in Oxnard, California. All of our gastroenterologists actually face a rigorous 50-Point Inspection, which includes customer reviews, history, complaints, ratings, satisfaction, trust, cost and general excellence. You deserve only the best!

8+ YEARS IN TBR
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MICHA ROJANY, MD

UNIO SPECIALTY CARE
1200 West Gonzales Road, Suite 100,
Oxnard, CA 93036 Directions

Since 2006

Specialty:

Pancreatitis IBS Gastric Ulcer Gastrointestinal Bleeding Hemorrhoid Therapy Abdominal and Pelvic Ultrasound Hernia Stomach Disorders Heartburn Gastritis Hepatitis Ulcerative Colitis Irritable Bowel Syndrome Peptic Ulcers Barrett's Esophagus Gastroesophageal Reflux Disease Viral Hepatitis Colonoscopy Colon Cancer Screening Upper GI Endoscopy ERCP Inflammatory Bowel Disease Hemorrhoid Banding

" Dr. Micha Rojany earned his undergraduate degree from the University of California, Berkeley. He attended USC Medical School and completed his internship and residency at Cedars-Sinai Medical Center in Los Angeles. Dr. Micha Rojany completed a fellowship in gastroenterology at the University of California, Davis. He has practiced in Ventura County since 2006 and is an active member of the local medical community and hospital staff at St. John’s Regional Medical Center in Oxnard and Pleasant Valley Hospital in Camarillo. He enjoys practicing as a gastroenterologist with special interests in inflammatory bowel disease and biliary tract diseases. Dr. Micha Rojany is able to offer online telehealth services for patients who want to see or speak to the provider from the comfort of their home. He is fluent in English, French, and Spanish. He practices at Unio Specialty Care.

2026 Highlights: Dr. Micha Rojany takes pride in providing excellent care while taking care of his patients and meeting their needs as a community specialist in digestive diseases. "

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License #1073553681

Price:

Office Visits $50
Procedures $200
Non-Office Procedures $300
Device/Equipment Replacement Fee $5000
Returned Check Fee $25

Contact:

(805) 946-2416 (805) 946-2417

Mon-Thu: 8am - 5pm
Fri: 8am - 4pm
Sat & Sun: Closed

TBR® Inspection Report:

8+ YEARS IN TBR
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KAREN SIMON, MD

UNIO SPECIALTY CARE
1200 West Gonzales Road, Suite 100,
Oxnard, CA 93036 Directions

Since 2008

Specialty:

Colonoscopy Stomach Disorders Esophageal Motility IBD Liver Disease Ulcer Barrett's Esophagus Upper Gastrointestinal Endoscopy Acid Reflux Endoscopic Retrograde Cholangiopancreatography Ultrasound Abdominal Pain Colon Cancer Screening ERCP Endoscopic Ultrasound Inflammatory Bowel Disease PEG Tube Placement Radiation Therapy for GI Cancers Urinary Tract Infections

" Dr. Karen Simon completed her B.A. from Stanford University in 1996. She attended Northwestern University for medical school. She earned her residency at Cedars-Sinai Medical Center in 2004 and her fellowship at UCLA and Cedars-Sinai in 2008. She has proudly been serving patients in Ventura County since 2008 and is very involved in field research. Dr. Karen Simon is also a speaker for Exact Sciences on behalf of Cologuard and is actively associated with research studies. She is a part of the Takeda Chloride Channel Council and a speaker for Amitiza as well. Dr. Karen Simonis is dedicated to developing a relationship with patients by utilizing education and mutual information sharing. She aims specifically to work with patients to discover the problem and develop a treatment strategy. She also offers online telehealth services. She practices at Unio Specialty Care.

2026 Highlights: Unio Specialty Care manages GERD, IBS, IBD, liver disease, gallbladder disorders, colon polyps, hemorrhoids, and more. "

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License #A81831

Price:

Office Visits $50
Procedures $200
Non-Office Procedures $300
Device Equipment Replacement Fee $5000
Returned Check Fee $25

Contact:

(805) 946-2416 (805) 946-2417

Mon-Thu: 8am - 5pm
Fri: 8am - 4pm
Sat & Sun: Closed

TBR® Inspection Report:

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JAY GUAN, MD

UNIO SPECIALTY CARE
1200 West Gonzales Road, Suite 100,
Oxnard, CA 93036 Directions

Since 2015

Specialty:

Upper Endoscopy Colonoscopy Hemorrhoid Banding Push Enteroscopy Endoscopic Eradication Therapy for Barrett’s Esophagus Endoscopic Dilation of Esophageal Strictures Percutaneous Gastrostomy Tube Placement Bravo P H Monitoring Video Capsule Endoscopy Esophageal Variceal Ligation/Banding Interpretation of Esophageal and Anal Manometries Inflammatory Bowel Disease Barrett's Esophagus NASH GI Motility Disorders Hepatitis B/C Eosinophilic Esophagitis Capsule Endoscopy Endoflip Barrett's Esophagus Ablation (BarRx) Variceal Banding PEG Tube Placement Hemorrhoid Therapy

" Dr. Jay Guan has extensive training in a broad range of GI disorders and procedures. He is a gastroenterologist in Los Angeles, California, and is affiliated with St. John's Regional Medical Center. He received his medical degree from Chicago Medical School/Rosalind Franklin University of Medicine and Science. His clinical focus includes Inflammatory Bowel Disease, Barrett’s Esophagus, NASH, GI motility disorders, Hepatitis B/C, and Eosinophilic Esophagitis. Dr. Jay Guan is passionate about applying the latest evidence-based care to help improve patients’ quality of life. He is a member of the American Society for Gastrointestinal Endoscopy, the American College of Gastroenterology, the American Medical Association, and the American College of Physicians. He is fluent in English, Mandarin, and Medical Spanish. Dr. Jay Guan practices at Unio Specialty Care.

2026 Highlights: Dr. Jay Guan aims to provide a practice that not only addresses patients’ health concerns but also respects the context of their life circumstances and personal beliefs. "

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License #A144843

Price:

Office Visits $50
Procedures $200
Non-Office Procedures $300
Device/Equipment Replacement Fee $5000
Returned Check Fee $25

Contact:

(805) 946-2416 (805) 946-2417

Mon-Thu: 8am - 5pm
Fri: 8am - 4pm
Sat & Sun: Closed

TBR® Inspection Report: