The 20 Best Gastrointestinal Stromal Tumor Doctors Near Me in Thousand Oaks, CA

Find the Top Gastrointestinal Stromal Tumor Experts and Specialists

Last Updated: 04/28/2026

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MediFind found 13 doctor with experience in Gastrointestinal Stromal Tumor near Thousand Oaks, CA. Of these, 12 are Experienced and 1 are Advanced.

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13 providers found
    Experienced in Gastrointestinal Stromal Tumor
    Experienced in Gastrointestinal Stromal Tumor

    Thousand Oaks Diagnostic Imaging Center

    2180 Lynn Rd, 
    Thousand Oaks, CA 
     (3.0 miles away)
    Languages Spoken:
    English

    David Aufrichtig is a Radiologist practicing medicine in Thousand Oaks, California. Dr. Aufrichtig is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. He is also highly rated in 6 other conditions, according to our data. His clinical expertise encompasses Progressive Familial Intrahepatic Cholestasis Type 3, Progressive Familial Intrahepatic Cholestasis Type 1, Progressive Familial Intrahepatic Cholestasis Type 2, Visceromegaly, and Bone Marrow Aspiration.

    Experienced in Gastrointestinal Stromal Tumor
    Gastroenterology
    Experienced in Gastrointestinal Stromal Tumor
    Gastroenterology

    Ventura County Gastroenterology Group

    4005 Mission Oaks Blvd, Ste A, 
    Camarillo, CA 
     (10.0 miles away)
    Languages Spoken:
    English
    Accepting New Patients
    Offers Telehealth

    Dr. Karen Simon received her B.A. from Stanford University in 1996. She then attended Northwestern University for medical school. She completed her residency at Cedars-Sinai Medical Center in 2004 and her fellowship at UCLA and Cedars in 2008.Dr. Simon has proudly been serving patients in Ventura County since 2008 and is very involved in field research. Dr. Simon is also a speaker for Exact Sciences on behalf of Cologuard and is actively associated in research studies. She is a part of the Takeda Chloride Channel Council and a speaker for Amitiza, as well.She enjoys educating the doctors and the community as a lecturer on topics such as colorectal cancer screening at St. John's Hospital, where she is also a part of the Ethics Committee.Dr. Simon aims specifically to work with patients to discover the problem and develop a treatment strategy. She has a particular interest in Celiac Disease, Inflammatory Bowel Disease (IBD), and a passion for improving colorectal cancer detection.She is dedicated to developing a relationship with patients by utilizing education and mutual information sharing. Dr. Simon is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. She is also highly rated in 21 other conditions, according to our data. Her clinical expertise encompasses Gastroesophageal Reflux Disease (GERD), Familial Adenomatous Polyposis, Swallowing Difficulty, Endoscopy, and Colonoscopy. Dr. Simon is board certified in Internal Medicine (Sub: Gastroenterology). Dr. Simon is currently accepting new patients.

    Experienced in Gastrointestinal Stromal Tumor
    Experienced in Gastrointestinal Stromal Tumor

    Ashwin Kashyap, M.D.

    425 Haaland Dr, 
    Thousand Oaks, CA 
     (1.2 miles away)
    Languages Spoken:
    English
    Offers Telehealth

    Ashwin Kashyap is an Oncologist practicing medicine in Thousand Oaks, California. Dr. Kashyap is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. He is also highly rated in 29 other conditions, according to our data. His clinical expertise encompasses Chronic B-Cell Leukemia (CBCL), Richter Syndrome, Chronic Lymphocytic Leukemia (CLL), and Non-Hodgkin Lymphoma.

    Learn about our expert tiers
    Experienced in Gastrointestinal Stromal Tumor
    Surgical Oncology | General Surgery
    Experienced in Gastrointestinal Stromal Tumor
    Surgical Oncology | General Surgery

    City Of Hope Medical Foundation

    425 Haaland Dr, Suite 101, 
    Thousand Oaks, CA 
     (1.2 miles away)
    Languages Spoken:
    English

    David Litvak is a Surgical Oncologist and a General Surgeon practicing medicine in Thousand Oaks, California. Dr. Litvak is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His clinical expertise encompasses Pseudomyxoma Peritonei, Gallbladder Disease, Gallstones, Hernia Surgery, and Small Bowel Resection.

    Experienced in Gastrointestinal Stromal Tumor
    Hematology | Oncology
    Experienced in Gastrointestinal Stromal Tumor
    Hematology | Oncology

    William J. Fisher M.D. FACS Inc.

    1250 La Venta Dr Ste 202, 
    Westlake Village, CA 
     (2.5 miles away)
    Experience:
    18+ years
    Languages Spoken:
    English

    Samuel Slomowitz is a Hematologist and an Oncologist practicing medicine in Westlake Village, California. He has been practicing medicine for over 18 years. Dr. Slomowitz is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. He is also highly rated in 41 other conditions, according to our data. His clinical expertise encompasses Colorectal Cancer, Familial Colorectal Cancer, Paget Disease of the Breast, Familial Pancreatic Cancer, and Bone Marrow Aspiration.

    Experienced in Gastrointestinal Stromal Tumor
    General Surgery
    Experienced in Gastrointestinal Stromal Tumor
    General Surgery

    David D Chi, MD

    555 Marin St Ste 210, 
    Thousand Oaks, CA 
     (3.2 miles away)
    Languages Spoken:
    English
    Accepting New Patients

    David Chi is a General Surgeon practicing medicine in Thousand Oaks, California. Dr. Chi is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. He is also highly rated in 13 other conditions, according to our data. His clinical expertise encompasses Breast Cancer, Choledocholithiasis, Paget Disease of the Breast, Hernia Surgery, and Lymphadenectomy. Dr. Chi is currently accepting new patients.

    Experienced in Gastrointestinal Stromal Tumor
    Experienced in Gastrointestinal Stromal Tumor

    Office

    1 Amgen Center Dr, 
    Newbury Park, CA 
     (4.2 miles away)
    Languages Spoken:
    English

    Carolyn Britten is an Oncologist practicing medicine in Newbury Park, California. Dr. Britten is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. She is also highly rated in 10 other conditions, according to our data. Her clinical expertise encompasses Colorectal Cancer, Familial Colorectal Cancer, Small Cell Lung Cancer (SCLC), and Squamous Cell Lung Carcinoma.

    Experienced in Gastrointestinal Stromal Tumor
    Oncology | Hematology
    Experienced in Gastrointestinal Stromal Tumor
    Oncology | Hematology
    1157 Swallow Lane, 
    Simi Valley, CA 
     (6.6 miles away)
    Languages Spoken:
    English
    Offers Telehealth

    Bahareh Bahadini is a Hematologist and an Oncologist practicing medicine in Simi Valley, California. Dr. Bahadini is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. She is also highly rated in 37 other conditions, according to our data. Her clinical expertise encompasses Inflammatory Breast Cancer, Breast Cancer, Angiosarcoma, and Paget Disease of the Breast.

    Advanced in Gastrointestinal Stromal Tumor
    Advanced in Gastrointestinal Stromal Tumor
    Camarillo, CA 
     (13.7 miles away)
    Languages Spoken:
    English
    Accepting New Patients
    Offers Telehealth

    Chirag Dalsania is a Hematologist practicing medicine in Camarillo, California. Dr. Dalsania is rated as an Advanced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. He is also highly rated in 51 other conditions, according to our data. His clinical expertise encompasses Thrombocytopenia, Iron Deficiency Anemia, Adult Immune Thrombocytopenia, and Immune Thrombocytopenic Purpura (ITP). Dr. Dalsania is currently accepting new patients.

    Experienced in Gastrointestinal Stromal Tumor
    General Surgery
    Experienced in Gastrointestinal Stromal Tumor
    General Surgery

    General Surgery Medical Group

    2460 Ponderosa Dr. North #A-117, 
    Camarillo, CA 
     (13.7 miles away)
    Languages Spoken:
    English
    Accepting New Patients

    Offers high-quality, individualized care with compassion. Believes communication and collaboration with patients is the foundation for effective relationships. Through effective education, patients are empowered to partner in their care and achieve their health goals. Dr. Lopresti is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. He is also highly rated in 10 other conditions, according to our data. His clinical expertise encompasses Choledocholithiasis, Gallstones, Gallbladder Disease, Bladder Reconstruction, and Hernia Surgery. Dr. Lopresti is board certified in Surgery General Surgery. Dr. Lopresti is currently accepting new patients.

    Experienced in Gastrointestinal Stromal Tumor
    Gastroenterology | Internal Medicine
    Experienced in Gastrointestinal Stromal Tumor
    Gastroenterology | Internal Medicine

    Genesis Healthcare Partners

    29525 Canwood St, 
    Agoura Hills, CA 
     (5.0 miles away)
    Experience:
    36+ years
    Languages Spoken:
    English
    Offers Telehealth

    Cyrus Badii is an Internal Medicine specialist and a Gastroenterologist practicing medicine in Agoura Hills, California. He has been practicing medicine for over 36 years. Dr. Badii is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. He is also highly rated in 9 other conditions, according to our data. His clinical expertise encompasses Hiatal Hernia, Congenital Diaphragmatic Hernia, Gastroesophageal Reflux Disease (GERD), Gastrectomy, and Gastrostomy. Dr. Badii is board certified in American Board Of Internal Medicine.

    Experienced in Gastrointestinal Stromal Tumor
    Gastroenterology
    Experienced in Gastrointestinal Stromal Tumor
    Gastroenterology

    UCLA Health West Hills Primary & Specialty Care

    7345 Medical Center Dr Ste 420, 
    West Hills, CA 
     (12.6 miles away)
    Languages Spoken:
    English
    Offers Telehealth

    Danny Issa is a Gastroenterologist practicing medicine in West Hills, California. Dr. Issa is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. He is also highly rated in 13 other conditions, according to our data. His clinical expertise encompasses Superior Mesenteric Artery Syndrome (SMAS), Jaundice, Nonalcoholic Steatohepatitis (NASH), Endoscopy, and Gastric Bypass.

    Experienced in Gastrointestinal Stromal Tumor
    Interventional Radiology
    Experienced in Gastrointestinal Stromal Tumor
    Interventional Radiology

    Kaiser Permanente Woodland Hills Medical Center

    5601 De Soto Ave, 
    Woodland Hills, CA 
     (14.8 miles away)
    Experience:
    17+ years
    Languages Spoken:
    English

    Robert Lieberman is an Interventional Radiologist practicing medicine in Woodland Hills, California. He has been practicing medicine for over 17 years. Dr. Lieberman is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. He is also highly rated in 9 other conditions, according to our data. His clinical expertise encompasses Pleurisy, Pleural Effusion, Gallbladder Disease, Bone Marrow Aspiration, and Gastrostomy.

    Showing 1-13 of 13

    Last Updated: 04/28/2026

    What is the definition of Gastrointestinal Stromal Tumor?

    A gastrointestinal stromal tumor (GIST) is a type of tumor that occurs in the gastrointestinal tract, most commonly in the stomach or small intestine. This type of tumor is thought to grow from specialized cells found in the gastrointestinal tract called interstitial cells of Cajal (ICCs) or precursors to these cells. Affected individuals can develop one or more tumors. GISTs are usually found in adults between ages 40 and 70; rarely, children and young adults develop this type of tumor.

    When should I see a Gastrointestinal Stromal Tumor doctor near Thousand Oaks, CA?

    There are various reasons why you may want to see a specialist, such as: 

    • Your primary care provider recommends it. 
    • Your condition requires expert knowledge and specialized care. 
    • Your symptoms persist or worsen despite treatment. 
    • You need specialized testing or procedures. 
    • You want a second opinion.  

    What should I consider when choosing a Gastrointestinal Stromal Tumor doctor near Thousand Oaks, CA?

    It’s important to see a provider with expertise in your specific condition. Each provider profile in MediFind’s doctor database includes information on which conditions they treat, years of experience, research contributions, languages spoken, insurance plans accepted, and more.  

    How does MediFind rank Gastrointestinal Stromal Tumor doctors near Thousand Oaks, CA?

    MediFind’s rankings are based on a variety of data sources, such as the number of articles a doctor has published in medical journals, participation in clinical trials and industry conferences, as well as the number of patients that provider sees for a given condition. Note that MediFind’s provider database is not based on user reviews, and providers do not pay to be included in the database. 

    What types of insurance are accepted by Gastrointestinal Stromal Tumor doctors near Thousand Oaks, CA?

    Most profiles in MediFind’s doctor database include a list of insurance plans accepted by that provider. However, it’s a good idea to contact the provider’s office to make sure they still accept your insurance, then doublecheck by contacting your insurance plan to confirm they’re in network. 

    How can I book an appointment online with a Gastrointestinal Stromal Tumor doctor near Thousand Oaks, CA?

    MediFind offers direct scheduling for certain providers using the “Request Appointment” button on that provider’s profile. If the schedule option is not available for a provider, tap the red “Show Phone Number” button on their profile to get their contact information. If you prefer to find providers who offer online scheduling, select “Schedules online” under the “Availability” category of the filter feature on the left side of the Gastrointestinal Stromal Tumor doctor search results page. 

    Why is it important to get a second opinion from a different Gastrointestinal Stromal Tumor doctor?

    Second opinions are an opportunity to confirm a diagnosis and its root cause, learn about alternative treatment options, or simply gain peace of mind. Many people, especially those with serious diagnoses, get second opinions so they can understand all their options and make informed decisions, so don’t hesitate to get one if you have any doubts or need more information or clarification regarding your care. Note that some insurance plans require second opinions, while others don’t cover second opinions, so be sure to confirm with your insurance provider first.   

    How can I prepare for my appointment with a Gastrointestinal Stromal Tumor doctor near Thousand Oaks, CA?

    Prepare for your appointment by gathering the following items: 

    • Copies of medical records (dating back at least one year) 
    • Your medical history, including illnesses, medical conditions, surgeries, and other doctors you see 
    • Family history of disease 
    • List of current prescription drugs, over-the-counter medicines, vitamins, and herbal remedies or supplements including names and doses 
    • Allergies to medications, food, latex, insects, etc.  
    • List of questions and concerns 
    • Your insurance card 

    You might also contact the provider’s office to see if they offer transportation or childcare services or if you’re allowed to bring a loved one for support or to take notes during your visit. 

    What questions should I ask my Gastrointestinal Stromal Tumor doctor?

    Here are some sample questions: 

    • Can you explain in simple terms what this condition is and how it’s treated? 
    • What symptoms or side effects should I watch for? 
    • What tests will be involved, and when can I expect results? 
    • Are there other specialists I need to see? 
    • What’s the best way to reach you if I have follow-up questions? 

    How can I learn about the latest clinical trials and research advances my Gastrointestinal Stromal Tumor doctor may know about?

    MediFind’s Clinical Trials tool asks you a series of questions to help you narrow down your search by health condition, age, gender, location, how far you’re willing to travel, and more. Each question you answer filters down the number of trials until you find the ones that are most relevant to you. 

    MediFind’s Latest Advances tool features summaries of recent articles published in medical journals. We use cutting-edge technology to scour medical publication databases for the latest research advancements on any given condition, then we simplify this information in a way that’s useful and easy to understand. 

    Can I filter my search to show male or female Gastrointestinal Stromal Tumor doctors near Thousand Oaks, CA?

    Look for the filter feature on the left side of the Gastrointestinal Stromal Tumor doctor search results page. Select “Female” or “Male” under the “Gender” category to search for female or male providers exclusively. If the “Any” option is selected, it will pull results for both male and female providers. 

    Can I filter my search to find a Gastrointestinal Stromal Tumor doctor that offers video calls?

    Look for the filter feature on the left-side of the Gastrointestinal Stromal Tumor doctor search results page. Select “Offers telehealth visits” under the Availability category to search for providers who offer virtual appointments (video calls). 

    Reviewed on: 11/11/24  

    By: MediFind Medical Staff 

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