The 20 Best Mast Cell Activation Syndrome (MCAS) Doctors Near Me in fenton, MO

Find the Top Mast Cell Activation Syndrome (MCAS) Experts and Specialists

Last Updated: 09/26/2026

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MediFind found 21 doctor with experience in Mast Cell Activation Syndrome (MCAS) near fenton, MO. Of these, 18 are Experienced, 2 are Advanced and 1 are Elite.

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21 providers found
    Elite in Mast Cell Activation Syndrome (MCAS)
    Gastroenterology
    Elite in Mast Cell Activation Syndrome (MCAS)
    Gastroenterology
    Referral may be required

    Specialist In Gastroenterology

    11525 Olde Cabin Rd, 
    Saint Louis, MO 
     (10.7 miles away)
    Languages Spoken:
    English
    Accepting New Patients
    Offers Telehealth

    Leonard Weinstock is a Gastroenterologist practicing medicine in Saint Louis, Missouri. Dr. Weinstock is rated as an Elite provider by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). He is also highly rated in 37 other conditions, according to our data. His clinical expertise encompasses Mast Cell Activation Syndrome (MCAS), Irritable Bowel Syndrome (IBS), Small Bowel Bacterial Overgrowth, Colonoscopy, and Endoscopy. Dr. Weinstock is currently accepting new patients.

    Experienced in Mast Cell Activation Syndrome (MCAS)
    Neurology | Neuromusculoskeletal Medicine
    Experienced in Mast Cell Activation Syndrome (MCAS)
    Neurology | Neuromusculoskeletal Medicine
    Referral may be required

    SSM Health Neurosciences

    1055 Bowles Ave., 
    Fenton, MO 
     (2.1 miles away)
    Languages Spoken:
    English, Spanish
    Accepting New Patients
    Offers Telehealth

    Laurence Kinsella is a Neurologist and a Neuromusculoskeletal Medicine provider practicing medicine in Fenton, Missouri. Dr. Kinsella is rated as an Experienced provider by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). He is also highly rated in 27 other conditions, according to our data. His clinical expertise encompasses Migraine, Orthostatic Hypotension, Parkinson's Disease, and Congenital Mirror Movement Disorder. Dr. Kinsella is board certified in American Board Of Psychiatry & Neurology , Missouri Dept Of Health/Narcotics&Dangerous Drugs , Missouri State Board Of Registration, American Board Of Internal Medicine , Drug Enforcement Administration , and American Board Of Physical Medicine & Rehabilitation/Neuromuscular Medicine . Dr. Kinsella is currently accepting new patients.

    Experienced in Mast Cell Activation Syndrome (MCAS)
    Internal Medicine
    Experienced in Mast Cell Activation Syndrome (MCAS)
    Internal Medicine

    Missouri Baptist Medical Center

    3015 N Ballas Rd, 
    Saint Louis, MO 
     (8.6 miles away)
    Languages Spoken:
    English
    Accepting New Patients
    Offers Telehealth

    William Birenbaum is a primary care provider, practicing in Internal Medicine in Saint Louis, Missouri. Dr. Birenbaum is rated as an Experienced provider by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). He is also highly rated in 14 other conditions, according to our data. His clinical expertise encompasses Chronic Kidney Disease, Lung Metastases, End-Stage Renal Disease (ESRD), Endoscopy, and Hip Replacement. Dr. Birenbaum is currently accepting new patients.

    Learn about our expert tiers
    Experienced in Mast Cell Activation Syndrome (MCAS)
    Internal Medicine
    Experienced in Mast Cell Activation Syndrome (MCAS)
    Internal Medicine

    Missouri Baptist Medical Center

    3015 N Ballas Rd, 
    Saint Louis, MO 
     (8.6 miles away)
    Languages Spoken:
    English

    Thishara Merza is a primary care provider, practicing in Internal Medicine in Saint Louis, Missouri. Dr. Merza is rated as an Experienced provider by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). She is also highly rated in 1 other condition, according to our data. Her clinical expertise encompasses Acute Pancreatitis, Peptic Ulcer, Sepsis, Endoscopy, and Ureteroscopy.

    Experienced in Mast Cell Activation Syndrome (MCAS)
    Family Medicine
    Experienced in Mast Cell Activation Syndrome (MCAS)
    Family Medicine

    St. Luke's Family Physicians - Westglen

    225 Clarkson Rd, 
    Ellisville, MO 
     (9.8 miles away)
    Languages Spoken:
    English
    Accepting New Patients
    Offers Telehealth

    Barbara O'brien is a primary care provider, practicing in Family Medicine in Ellisville, Missouri. Dr. O'brien is rated as an Experienced provider by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). Her clinical expertise encompasses Hypertension, Familial Hypertension, Glucocorticoid-Remediable Aldosteronism, and Diabetic Nephropathy. Dr. O'brien is currently accepting new patients.

    Experienced in Mast Cell Activation Syndrome (MCAS)
    Dermatology
    Experienced in Mast Cell Activation Syndrome (MCAS)
    Dermatology
    Referral may be required

    Office

    4901 Forest Park Ave, 
    Saint Louis, MO 
     (13.1 miles away)
    Languages Spoken:
    English
    Accepting New Patients

    Brian Kim is a Dermatologist practicing medicine in Saint Louis, Missouri. Dr. Kim is rated as an Experienced provider by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). His clinical expertise encompasses Scabies, Mast Cell Activation Syndrome (MCAS), Prurigo Nodularis, and Hives. Dr. Kim is currently accepting new patients.

    Experienced in Mast Cell Activation Syndrome (MCAS)
    Allergy and Immunology
    Experienced in Mast Cell Activation Syndrome (MCAS)
    Allergy and Immunology
    Referral may be required

    Signature Allergy & Immunology

    425 N New Ballas Rd, Suite 203, 
    Creve Coeur, MO 
     (10.4 miles away)
    Languages Spoken:
    English, Hindi
    Accepting New Patients
    Offers Telehealth

    Hamsa Subramanian is an Allergy and Immunologist practicing medicine in Creve Coeur, Missouri. Dr. Subramanian is rated as an Experienced provider by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). She is also highly rated in 24 other conditions, according to our data. Her clinical expertise encompasses Hives, Common Variable Immune Deficiency, Angioedema, and Allergic Rhinitis. Dr. Subramanian is currently accepting new patients.

    Advanced in Mast Cell Activation Syndrome (MCAS)
    Internal Medicine
    Advanced in Mast Cell Activation Syndrome (MCAS)
    Internal Medicine

    Office

    1110 Highlands Plaza Dr E Ste 300, 
    Saint Louis, MO 
     (12.3 miles away)
    Languages Spoken:
    English
    Accepting New Patients
    Offers Telehealth

    Jennifer Monroy is a primary care provider, practicing in Internal Medicine in Saint Louis, Missouri. Dr. Monroy is rated as an Advanced provider by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). She is also highly rated in 10 other conditions, according to our data. Her clinical expertise encompasses Common Variable Immune Deficiency, Primary Immunodeficiency (PID), Ganglioglioma, and Epidermal Nevus. Dr. Monroy is currently accepting new patients.

    Advanced in Mast Cell Activation Syndrome (MCAS)
    Advanced in Mast Cell Activation Syndrome (MCAS)
    Referral may be required

    Washington University

    660 S Euclid Ave, 
    Saint Louis, MO 
     (12.9 miles away)
    Languages Spoken:
    English
    Accepting New Patients

    Stephen Oh is a Hematologist practicing medicine in Saint Louis, Missouri. Dr. Oh is rated as an Advanced provider by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). He is also highly rated in 21 other conditions, according to our data. His clinical expertise encompasses Myelofibrosis, Myeloproliferative Neoplasms (MPN), Essential Thrombocythemia, Polycythemia Vera, and Pancreaticoduodenectomy. Dr. Oh is currently accepting new patients.

    Experienced in Mast Cell Activation Syndrome (MCAS)
    Allergy and Immunology
    Experienced in Mast Cell Activation Syndrome (MCAS)
    Allergy and Immunology
    Referral may be required

    Office

    10 Barnes West Dr Ste 200, 
    Saint Louis, MO 
     (10.1 miles away)
    Languages Spoken:
    English
    Accepting New Patients
    Offers Telehealth

    H Wedner is an Allergy and Immunologist practicing medicine in Saint Louis, Missouri. Dr. Wedner is rated as an Experienced provider by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). He is also highly rated in 14 other conditions, according to our data. His clinical expertise encompasses Common Variable Immune Deficiency, Primary Immunodeficiency (PID), Bloom Syndrome, and Urticaria Pigmentosa. Dr. Wedner is currently accepting new patients.

    Experienced in Mast Cell Activation Syndrome (MCAS)
    Experienced in Mast Cell Activation Syndrome (MCAS)
    Referral may be required

    The Orthopedic Center Of St. Louis

    10 Barnes West Dr Ste 200, 
    Creve Coeur, MO 
     (10.1 miles away)
    Languages Spoken:
    English
    Accepting New Patients

    Charles Crecelius is a Geriatrics provider practicing medicine in Creve Coeur, Missouri. Dr. Crecelius is rated as an Experienced provider by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). He is also highly rated in 2 other conditions, according to our data. His clinical expertise encompasses End-Stage Renal Disease (ESRD), Pneumonia, Vascular Dementia, Colonoscopy, and Hip Replacement. Dr. Crecelius is currently accepting new patients.

    Experienced in Mast Cell Activation Syndrome (MCAS)
    Allergy and Immunology
    Experienced in Mast Cell Activation Syndrome (MCAS)
    Allergy and Immunology
    Referral may be required

    The Orthopedic Center Of St. Louis

    10 Barnes West Dr Ste 200, 
    Creve Coeur, MO 
     (10.1 miles away)
    Languages Spoken:
    English
    Accepting New Patients
    Offers Telehealth

    Maya Jerath is an Allergy and Immunologist practicing medicine in Creve Coeur, Missouri. Dr. Jerath is rated as an Experienced provider by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). She is also highly rated in 3 other conditions, according to our data. Her clinical expertise encompasses Hives, Angioedema, Alpha-gal Syndrome (AGS), and Common Variable Immune Deficiency. Dr. Jerath is currently accepting new patients.

    Experienced in Mast Cell Activation Syndrome (MCAS)
    General Surgery
    Experienced in Mast Cell Activation Syndrome (MCAS)
    General Surgery
    Referral may be required

    Suburban Surgical Associates Inc.

    555 N New Ballas Rd Ste 265, 
    Saint Louis, MO 
     (10.1 miles away)
    Languages Spoken:
    English
    Accepting New Patients

    Jeffrey Zuke is a General Surgeon practicing medicine in Saint Louis, Missouri. Dr. Zuke is rated as an Experienced provider by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). He is also highly rated in 5 other conditions, according to our data. His clinical expertise encompasses Hernia, Gallstones, Choledocholithiasis, Hernia Surgery, and Gastrectomy. Dr. Zuke is currently accepting new patients.

    Experienced in Mast Cell Activation Syndrome (MCAS)
    Gastroenterology
    Experienced in Mast Cell Activation Syndrome (MCAS)
    Gastroenterology
    Referral may be required

    Office

    11525 Olde Cabin Rd Ste 101, 
    Saint Louis, MO 
     (10.1 miles away)
    Languages Spoken:
    English
    Accepting New Patients

    Erik Thyssen is a Gastroenterologist practicing medicine in Saint Louis, Missouri. Dr. Thyssen is rated as an Experienced provider by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). He is also highly rated in 25 other conditions, according to our data. His clinical expertise encompasses Gastric Dysmotility, Crohn's Disease, Familial Adenomatous Polyposis, Endoscopy, and Gastrectomy. Dr. Thyssen is currently accepting new patients.

    Experienced in Mast Cell Activation Syndrome (MCAS)
    Gastroenterology
    Experienced in Mast Cell Activation Syndrome (MCAS)
    Gastroenterology
    Referral may be required

    Specialist In Gastroenterology

    11525 Olde Cabin Rd, 
    Saint Louis, MO 
     (10.7 miles away)
    Languages Spoken:
    English, Hindi, Punjabi
    Accepting New Patients

    Aman Singh is a Gastroenterologist practicing medicine in Saint Louis, Missouri. Dr. Singh is rated as an Experienced provider by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). She is also highly rated in 30 other conditions, according to our data. Her clinical expertise encompasses Angiodysplasia of the Colon, Heartburn, Familial Adenomatous Polyposis, Endoscopy, and Gastrectomy. Dr. Singh is currently accepting new patients.

    Experienced in Mast Cell Activation Syndrome (MCAS)
    Experienced in Mast Cell Activation Syndrome (MCAS)
    Referral may be required

    The Siteman Cancer Center Medical Oncology

    10 Barnes West Dr, 
    Saint Louis, MO 
     (11.2 miles away)
    Languages Spoken:
    English
    Accepting New Patients
    Offers Telehealth

    Tiffany Dy is a Pediatrics provider practicing medicine in Saint Louis, Missouri. Dr. Dy is rated as an Experienced provider by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). Her clinical expertise encompasses Pulmonary Hypertension, Osteoporosis, Chronic Spontaneous Urticaria (CSU), and Mast Cell Activation Syndrome (MCAS). Dr. Dy is currently accepting new patients.

    Experienced in Mast Cell Activation Syndrome (MCAS)
    Internal Medicine
    Experienced in Mast Cell Activation Syndrome (MCAS)
    Internal Medicine

    Office

    1110 Highlands Plaza Dr E Ste 300, 
    Saint Louis, MO 
     (12.3 miles away)
    Languages Spoken:
    English
    Accepting New Patients

    Zhen Ren is a primary care provider, practicing in Internal Medicine in Saint Louis, Missouri. Dr. Ren is rated as an Experienced provider by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). She is also highly rated in 1 other condition, according to our data. Her clinical expertise encompasses Angioedema, Hereditary Angioedema, Hives, and Atypical Hemolytic Uremic Syndrome (aHUS). Dr. Ren is currently accepting new patients.

    Experienced in Mast Cell Activation Syndrome (MCAS)
    Nurse Practitioner
    Experienced in Mast Cell Activation Syndrome (MCAS)
    Nurse Practitioner
    Referral may be required

    SSM Health Saint Louis University Hospital

    3635 Vista Ave Fl 1, 
    Saint Louis, MO 
     (12.3 miles away)
    Languages Spoken:
    English
    Accepting New Patients

    Jennifer Gardner is a Nurse Practitioner practicing medicine in Saint Louis, Missouri. Gardner, NP is rated as an Experienced provider by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). Her clinical expertise encompasses Mast Cell Activation Syndrome (MCAS). Gardner, NP is currently accepting new patients.

    Experienced in Mast Cell Activation Syndrome (MCAS)
    Experienced in Mast Cell Activation Syndrome (MCAS)
    Referral may be required

    St. Louis Children's Hospital

    1 Childrens Pl, 
    Saint Louis, MO 
     (13.0 miles away)
    Languages Spoken:
    English
    Accepting New Patients

    Caroline Horner is a Pediatrics provider practicing medicine in Saint Louis, Missouri. Dr. Horner is rated as an Experienced provider by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). Her clinical expertise encompasses Mast Cell Activation Syndrome (MCAS) and Chronic Spontaneous Urticaria (CSU). Dr. Horner is currently accepting new patients.

    Experienced in Mast Cell Activation Syndrome (MCAS)
    Internal Medicine
    Experienced in Mast Cell Activation Syndrome (MCAS)
    Internal Medicine

    Saint Louis University

    3660 Vista Ave, 
    Saint Louis,, MO 
     (13.3 miles away)
    Languages Spoken:
    English
    Accepting New Patients

    Sonia Mathew is a primary care provider, practicing in Internal Medicine in Saint Louis,, Missouri. Dr. Mathew is rated as an Experienced provider by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). She is also highly rated in 7 other conditions, according to our data. Her clinical expertise encompasses Allergic Rhinitis, Empyema, Grass Allergy, and Sinusitis. Dr. Mathew is currently accepting new patients.

    Showing 1-20 of 21

    Last Updated: 09/26/2026

    What is the definition of Mast Cell Activation Syndrome (MCAS)?

    Mast cell activation syndrome (MCAS) causes a person to have repeated severe allergy symptoms affecting several body systems. In MCAS, mast cells mistakenly release too many chemical agents, resulting in symptoms in the skin, gastrointestinal tract, heart, respiratory, and neurologic systems. Mast cells are present throughout most of our bodies and secrete different chemicals during allergic reactions. Symptoms include episodes of abdominal pain, cramping, diarrhea, flushing, itching, wheezing, coughing, lightheadedness and rapid pulse and low blood pressure. Symptoms can start at any age, but usually begin in adulthood. The cause of MCAS is unknown. Diagnosis is based on the symptoms, clinical exam, and specific laboratory testing. Other conditions may need to be excluded before MCAS can be diagnosed.

    When should I see a Mast Cell Activation Syndrome (MCAS) doctor near fenton, MO?

    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 Mast Cell Activation Syndrome (MCAS) doctor near fenton, MO?

    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 Mast Cell Activation Syndrome (MCAS) doctors near fenton, MO?

    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 Mast Cell Activation Syndrome (MCAS) doctors near fenton, MO?

    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 Mast Cell Activation Syndrome (MCAS) doctor near fenton, MO?

    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 Mast Cell Activation Syndrome (MCAS) doctor search results page. 

    Why is it important to get a second opinion from a different Mast Cell Activation Syndrome (MCAS) 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 Mast Cell Activation Syndrome (MCAS) doctor near fenton, MO?

    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 Mast Cell Activation Syndrome (MCAS) 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 Mast Cell Activation Syndrome (MCAS) 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 Mast Cell Activation Syndrome (MCAS) doctors near fenton, MO?

    Look for the filter feature on the left side of the Mast Cell Activation Syndrome (MCAS) 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 Mast Cell Activation Syndrome (MCAS) doctor that offers video calls?

    Look for the filter feature on the left-side of the Mast Cell Activation Syndrome (MCAS) 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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