Gastroenterologist in Oxnard, CA | Colonoscopy & GI Care
Gastroenterology • Oxnard, CA
Information from public sources; not independently verified. Confirm hours, insurance and appointment availability with the clinic.
Last gathered July 10, 2026. How our information is sourced · Report incorrect information
About
Unio Specialty Care – Gastroenterology in Oxnard, CA offers comprehensive digestive and liver care, including colonoscopy and colorectal cancer screening, upper endoscopy, flexible sigmoidoscopy, capsule endoscopy, ERCP, endoscopic ultrasound, liver evaluation with FibroScan testing, hemorrhoid banding therapy, and SIBO breath testing with nutrition counseling. The clinic accepts new patients and most major insurance plans.
Services Offered
Technology & Equipment
Insurance & Payment
Yes — we accept most major insurance plans. We’ll confirm your coverage prior to your visit.
Languages Spoken
Not published.
Pricing
Current Offers
Accepting New Patients
FAQs
Do you accept new patients?
Yes—we are accepting new patients.
Do I need a referral to see a GI doctor in Oxnard?
(Duplicate question from page) Depending on your insurance plan, a referral may be required. Our team will verify your benefits when scheduling.
Is this clinic in-network with my insurance?
Yes — we accept most major insurance plans. We’ll confirm your coverage prior to your visit.
Awards & Accreditations
Social Media
Photos
Photos published by Gastroenterologist in Oxnard, CA | Colonoscopy & GI Care showing the gastroenterology practice in Oxnard, CA.
What Patients Say
Overall sentiment across review platforms: positive
- Healthgrades (Dr. Karen Simon): 4.6/5 stars (133 reviews) (133)
- Vitals (Dr. Micha Rojany): 4.3/5 stars (42)
- Healthgrades (Dr. John Billesdon): 5.0/5 stars (14)
- Birdeye/Google (Ventura County Gastroenterology Medical Group): 4.7/5 stars (275)
- Vitals (Dr. Donald L. Miller): 4.8/5 stars
Patients praise
- Doctors described as caring, attentive listeners, and professional
- Staff generally perceived as friendly and helpful during visits
- Clear explanations of procedures (e.g., colonoscopy, EGD) and test results
- Effective diagnostic and treatment outcomes reported by many patients
Common complaints
- Difficulty scheduling appointments and long wait times for new patient visits
- Frustrations with office communication, including lack of callbacks and follow-up on procedures
- Occasional reports of feeling like a low priority due to insurance type (e.g., HMO)
"She is an extremely good listener and goes out of her way to ensure you get all of your questions answered."
- Healthgrades Review"He takes the time to explain the procedure and answer all my questions. Dr. Rojany makes sure I am comfortable and pain free..."
- Vitals Review"I have always received good quality care, but getting an appointment has always taken months."
- Demandforce ReviewSynthesized from public review platforms as of Jul 10, 2026 - sources: [1][2][3][4].
In the News
- Justin Michael Marasigan, DO | Gastroenterology | Oxnard, CA - Feb 18, 2026
- Dr. Karen Simon, MD - Gastroenterologist in Oxnard, CA - Jan 23, 2026
- Dr. Ashwinee Condon, MD - Gastroenterologist in Oxnard, CA - Jan 11, 2026
- Dr. Justin Marasigan, DO, Camarillo, CA | Gastroenterologist - Zocdoc - Jun 18, 2026
- Micha S. Rojany, MD | Gastroenterology | Camarillo, CA - Feb 17, 2026
Information sourced from the clinic's website as of July 10, 2026.
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