Dr. Mark L. Geller

Internal Medicine
Providence
18133 Ventura Boulevard, Suite 204, 
Tarzana, CA 
Offers Telehealth
Providence
18133 Ventura Boulevard, Suite 204, 
Tarzana, CA 
OverviewInsuranceLocationsSimilar Doctors

Overview

Mark Geller is an Internal Medicine provider in Tarzana, California. Dr. Geller is rated as an Experienced provider by MediFind in the treatment of Supravalvular Aortic Stenosis. His top areas of expertise are Thyroid Nodule, Vitamin D Deficiency, Obesity in Children, and Hypothyroidism.

Specialties
Internal Medicine
Licenses
Internal Medicine in CA
Languages Spoken
English
Gender
Male

Insurance

Accepted insurance can change. Please verify directly with the provider.

Find your insurance
Find your insuranceClose

Locations

18133 Ventura Boulevard, Suite 204, Tarzana, CA 91356
Call: 818-466-7700

Additional Areas of Focus

Dr. Geller has provided the following conditions as areas of focus. Please note that we may not have enough data to validate their experience in some of these conditions.

Hypoparathyroidism
Non-Alcoholic Fatty Liver Disease
Nonalcoholic Steatohepatitis (NASH)
Similar Doctors
Advanced in Supravalvular Aortic Stenosis
Dr. William P. Fukuda
Internal Medicine
Advanced in Supravalvular Aortic Stenosis
Dr. William P. Fukuda
Internal Medicine

Newport Center Medical Group

400 Newport Ctr Dr, Suite 504, 
Newport Beach, CA 
 (53.5 miles away)
949-720-4920
Languages Spoken:
English
See accepted insurances
Offers Telehealth

William Fukuda is a primary care provider, practicing in Internal Medicine in Newport Beach, California. Dr. Fukuda is rated as an Advanced provider by MediFind in the treatment of Supravalvular Aortic Stenosis. His top areas of expertise are Familial Combined Hyperlipidemia, Xanthoma, High Cholesterol, and Carbuncle.

Advanced in Supravalvular Aortic Stenosis
Dr. Ronald P. Olah
Internal Medicine
Advanced in Supravalvular Aortic Stenosis
Dr. Ronald P. Olah
Internal Medicine

The Huntington Medical Foundation

65 N Madison Ave, Suite 800, 
Pasadena, CA 
 (22.3 miles away)
626-792-3141
Languages Spoken:
English
See accepted insurances
Offers Telehealth

Ronald Olah is a primary care provider, practicing in Internal Medicine in Pasadena, California. Dr. Olah is rated as an Advanced provider by MediFind in the treatment of Supravalvular Aortic Stenosis. His top areas of expertise are Enlarged Prostate (BPH), Heartburn, Glucocorticoid-Remediable Aldosteronism, and Familial Hypertension.

Advanced in Supravalvular Aortic Stenosis
Dr. Garry Forkosh
Internal Medicine
Advanced in Supravalvular Aortic Stenosis
Dr. Garry Forkosh
Internal Medicine

Advantage Hospitalists, Inc

215 W Janss Rd, 
Thousand Oaks, CA 
 (20.5 miles away)
805-497-2727
Languages Spoken:
English
See accepted insurances

Garry Forkosh is a primary care provider, practicing in Internal Medicine in Thousand Oaks, California. Dr. Forkosh is rated as an Advanced provider by MediFind in the treatment of Supravalvular Aortic Stenosis. His top areas of expertise are Sepsis, Malnutrition, Supravalvular Aortic Stenosis, Gastrostomy, and Endoscopy.

VIEW MORE SUPRAVALVULAR AORTIC STENOSIS DOCTORS

Areas of Expertise

MediFind evaluates expertise by pulling from factors such as number of articles a doctor has published in medical journals, participation in clinical trials, speaking at industry conferences, prescribing and referral patterns, and strength of connections with other experts in their field.

Learn more about MediFind’s expert tiers

Find Dr. Geller's expertise for a condition
ConditionClose
    • Distinguished
    • Thyroid Nodule
      Dr. Geller is
      Distinguished
      . Learn about Thyroid Nodule.
      See more Thyroid Nodule experts
    • Advanced
    • Hypothyroidism
      Dr. Geller is
      Advanced
      . Learn about Hypothyroidism.
      See more Hypothyroidism experts
    • Obesity in Children
      Dr. Geller is
      Advanced
      . Learn about Obesity in Children.
      See more Obesity in Children experts
    • Type 2 Diabetes (T2D)
      Dr. Geller is
      Advanced
      . Learn about Type 2 Diabetes (T2D).
      See more Type 2 Diabetes (T2D) experts
    • Vitamin D Deficiency
      Dr. Geller is
      Advanced
      . Learn about Vitamin D Deficiency.
      See more Vitamin D Deficiency experts
    • Experienced
    • Alopecia Areata
      Dr. Geller is
      Experienced
      . Learn about Alopecia Areata.
      See more Alopecia Areata experts
    • Autosomal Recessive Hypotrichosis
      Dr. Geller is
      Experienced
      . Learn about Autosomal Recessive Hypotrichosis.
      See more Autosomal Recessive Hypotrichosis experts
    • Cushing's syndrome
      Dr. Geller is
      Experienced
      . Learn about Cushing's syndrome.
      See more Cushing's syndrome experts
    • Cushing's syndrome due to Adrenal Tumor
      Dr. Geller is
      Experienced
      . Learn about Cushing's syndrome due to Adrenal Tumor.
      See more Cushing's syndrome due to Adrenal Tumor experts
    • Diabetic Nephropathy
      Dr. Geller is
      Experienced
      . Learn about Diabetic Nephropathy.
      See more Diabetic Nephropathy experts
    • Diabetic Neuropathy
      Dr. Geller is
      Experienced
      . Learn about Diabetic Neuropathy.
      See more Diabetic Neuropathy experts
    View All 31 Experienced Conditions
    Want to save this doctor for later?
    Sign Up
    Is this your doctor?
    Find A Second Opinion
    Not sure about your diagnosis?
    Check Your Symptoms
     
     
     
     
    Learn about our expert tiers
    Learn More
    Are you the provider on this profile?
    Claim Profile
    For Patients
    • Our Story
    • How MediFind Works
    • Conditions A-Z
    • Doctor Directory
    • Symptoms Directory
    • Procedures Directory
    • Treatment Directory
    • Drug Directory
    • Infusion Center Finder
    • FAQ
    • Contact Us
    For Providers and Practices
    • Claim Your Profile
    • Newsroom
    Business Solutions
    • Provider
    • Network Solutions
    Additional Resources
    • Consumer Health Data Privacy Policy
    • Privacy Policy
    • Terms of Use
    • Advertising Policy
    • Content Policy
    Subscribe to our newsletter

    Sign up to stay informed about MediFind and get wellness sent your way.

    Close

      By subscribing, I agree to MediFind's Terms of Use, Privacy Policy and Consumer Health Data Privacy Policy, as applicable.

      Bullet PinMediFind
      Follow us on
      This information is not intended as a substitute for informed medical advice. You should work with a licensed professional to diagnose and treat health conditions. We let the data speak for itself, MediFind does not endorse any healthcare providers.
      © 2026 All Rights Reserved

      Request an Appointment

      If you are experiencing a medical emergency, call 9-1-1.

      MediFind will contact the provider for your appointment request. You’ll receive status updates by email. Your provider or MediFind will reach out to you directly by phone or email to schedule your appointment or request additional information.

      Patient Details

      This information is for the patient who will be seen at the appointment.

        Close

        Returning patient? Use your address on file with the provider.

        Insurance Details

        Please provide information of the primary insurance holder as the practice may require this information to schedule.

        Insurance Provider *
        Insurance ProviderClose

        Appointments Details

        Let’s get more information about your appointment.

                0 / 1000
                0 / 1000
                By pressing the Submit button you are agreeing to MediFind’s Terms of Use, Privacy Policy and Consumer Health Data Privacy Policy, as applicable.