Dr. Karen Simon, MD | Oxnard, CA | Gastroenterologist

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Dr. Karen Simon treats colon polyps, hemorrhoids, and diverticular disease, and performs lower GI endoscopy, colonoscopy, and upper GI endoscopy. They practice gastroenterology and have 25 years of experience, with an affiliation at Saint Johns Regional Medical Center. Dr. Simon completed a residency at Cedars Sinai Medical Center and sees patients in Oxnard and Camarillo, California.

Overview based on verified provider data

accepting new patients
4.2

46 Ratings
25 years of experience
61 insurance plans accepted
speaks English
Cedars Sinai Medical Center
33 written reviews
1 award
1 specialty
12 areas of expertise
1 hospital affiliation
2 office locations

Gave an accurate diagnosis
Had a good bedside manner
Spent time with me

Based on patient feedback. Read the reviews

Dr. Simon's Ratings and Reviews

4.2

46 Ratings with 33 written Reviews

Average Wait Time 15 Minutes

How was your appointment with
Dr. Simon?

Patients’ Perspective

Gave an accurate diagnosis: (27) Did WellNeeds Improvement (4)
Had a good bedside manner: (28) Did WellNeeds Improvement (6)
Spent time with me: (28) Did WellNeeds Improvement (6)
Provided follow-up after the visit: (24) Did WellNeeds Improvement (5)
Flexible scheduling: (22) Did WellNeeds Improvement (5)
Saw me in a timely manner: (1) Did WellNeeds Improvement (0)
Staff was courteous: (1) Did WellNeeds Improvement (0)

Patients praise Dr. Karen Simon for her professionalism, attentiveness, and excellent communication skills. They commend her bedside manner, thoroughness in addressing symptoms, and ability to make patients feel comfortable and valued. However, some patients express frustration with the office's new appointment scheduling service, finding it difficult to secure timely appointments and feeling that communication with the office staff could be improved. Despite these concerns, they remain loyal to Dr. Simon due to her compassionate care and effective listening.

AI-generated from the text of patient reviews

46 ratings & reviews

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Showing 1 to 10 of 33 reviews

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Wonderful team from start to finish. Very professional, very efficient and kind.

Did Well

Had a good bedside manner
Spent time with me
Flexible scheduling
Saw me in a timely manner
Staff was courteous

Needs Improvement

September 14th, 2026

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Always Dr.Simon is really good for my concerns and my follow up.

June 25th, 2026

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Very thoughtful. Attentive to my issues. Friendly. Felt she listened to what I had to say.

Did Well

Gave an accurate diagnosis
Had a good bedside manner
Spent time with me
Provided follow-up after the visit
Flexible scheduling

Needs Improvement

March 3rd, 2026

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Great Experience!

Did Well

Gave an accurate diagnosis
Had a good bedside manner
Spent time with me
Provided follow-up after the visit
Flexible scheduling

Needs Improvement

March 3rd, 2026

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Dr Simon was very kind and easy to talk to. I really appreciate her bedside manner, as well as her thoroughness in discussing my symptoms.

Did Well

Gave an accurate diagnosis
Had a good bedside manner
Spent time with me
Flexible scheduling

Needs Improvement

March 3rd, 2026

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I called yesterday hoping to get an appointment and was so surprised to be able to see her today. Dr. Simon is so easy to communicate with and I felt instantly relieved with her knowledge and caring personality. I would highly recommend her.

Did Well

Gave an accurate diagnosis
Had a good bedside manner
Spent time with me
Provided follow-up after the visit
Flexible scheduling

Needs Improvement

December 2nd, 2025

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I appreciated the information that Dr Simon provided me with regarding the new treatment for hemorrhoids. She was very helpful and was going to give me her assistant‘s extension but I guess she might have forgotten because I didn’t get it this morning. Would appreciate receiving it. Thank you, Sharon Grote

Did Well

Gave an accurate diagnosis
Had a good bedside manner
Spent time with me
Flexible scheduling

Needs Improvement

September 5th, 2025

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Dr Simon always makes me feel very comfortable when I discuss my health concerns. She’s very supportive and professional.

Did Well

Gave an accurate diagnosis
Had a good bedside manner
Spent time with me
Provided follow-up after the visit
Flexible scheduling

Needs Improvement

May 27th, 2025

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I really like Dr. Simon. She She is friendly, professional, informative, and set me at ease. My experience with all the office staff was equally positive. I will recommend Dr. Simon to my family and anyone seeking a GI specialist.

February 13th, 2025

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Very thorough. Listens and explains things well. Communicates with my other doctors on overall body system.

Did Well

Gave an accurate diagnosis
Had a good bedside manner
Spent time with me
Provided follow-up after the visit
Flexible scheduling

Needs Improvement

February 13th, 2025

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Unio Specialty Care - Gastroenterology

1200 W Gonzalez Rd Ste 100Oxnard, CA 93036

Tel: (805) 946-2419

Unio Specialty Care - Gastroenterology

4009 Mission Oaks Blvd # ACamarillo, CA 93012

Tel: (805) 312-9560


Dr. Karen Simon, MD	Chimdi Mfebe, APRN	Jan Seiler, APRN	Rebecca Humphries, APRN
Gastroenterology	Gastroenterology	Gastroenterology	Gastroenterology
Accepts New Patients	Accepts New Patients	Accepts New Patients	Accepts New Patients
4.2 (46 Ratings)	0 (0 Ratings)	0 (0 Ratings)	0 (0 Ratings)
25 Years of Experience
No Virtual Visit Option	Virtual Visit Available	Virtual Visit Available	Virtual Visit Available
Speaks English	Speaks English	Speaks English	Speaks English
Oxnard , CA	Little Rock , AR	Montgomery , AL	Sacramento , CA
Med School: Northwestern University The Feinberg School Of Medicine	Med School: Chamberlain University College of Nursing	Med School: Georgia State University	Med School: Emory University
Current Profile	View Profile	View Profile	View Profile

Search for your insurance and plan

Gastroenterology

Acid Reflux Disease (Gastroesophageal Reflux / GERD)
Check-up
Constipation
Heartburn
Hepatitis C
Immunization
Irritable Bowel Syndrome (IBS)
Physical
Ulcerative Colitis
Vaccination
Weight Loss
Weight Loss (non-surgical)

Dr. Karen Simon holds an active medical license in the state of California.

Medical License

Medical Doctor with an active medical license in the state of California that expires in 2026.

Education & Training

Residency

Completed their residency at Cedars Sinai Medical Center.

Medical School

Graduated from Northwestern University The Feinberg School Of Medicine and Northwestern University Feinberg School Of Medicine in 2001.

NPI Number

Dr. Simon's NPI number is 1548384167.

Sara Thorsen Houck
Nurse Practitioner
| Thousand Oaks, CA
(0)
Claudio Cardenas
Nurse Practitioner
| Oxnard, CA
(0)
Aashika Dhungel Rafanan
Nurse Practitioner
| Oxnard, CA
(0)
Dr. Mysore Rangappa Nagaraja, MD
Gastroenterology
56 Years Exp | Northridge, CA
(15)
Dr. Adebambo Oladele Ojuri, MD
Gastroenterology
42 Years Exp | Murrieta, CA
(21)
Dr. Sabine Solika Hazan, MD
Gastroenterology
34 Years Exp | Ventura, CA
(41)
Dr. Gregory Harold Johnson, MD
Internal Medicine
54 Years Exp | Westlake Village, CA
(23)
Dr. Chetan Vithal Gondha, MD
Gastroenterology
23 Years Exp | Ventura, CA
(14)
Dr. Cynthia Ching See, MD
Gastroenterology
46 Years Exp | West Hills, CA
(44)
Dr. Dhruv Verma, MD
Internal Medicine
16 Years Exp | Ventura, CA
(1)

What languages does Dr. Karen Simon speak?: Dr. Karen Simon speaks English.
Is Dr. Karen Simon accepting new patients?: Dr. Karen Simon is accepting new patients on Vitals. View Dr. Karen Simon's profile on Vitals to make an appointment.
How can I make an appointment with Dr. Karen Simon?: You can find contact information for Dr. Karen Simon here on Vitals.
Where is Dr. Karen Simon's office located?: Dr. Karen Simon's office is located at 1200 W Gonzalez Rd Ste 100, Oxnard, CA, 93036.
Does Dr. Karen Simon accept my insurance?: You can see the insurance plans that Dr. Karen Simon accepts on their Vitals profile.

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