The 20 Best Methylmalonic Acidemia with Homocystinuria Doctors Near Me in Orange, CA

Find the Top Methylmalonic Acidemia with Homocystinuria Experts and Specialists

Last Updated: 04/28/2026

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MediFind found 54 doctor with experience in Methylmalonic Acidemia with Homocystinuria near Orange, CA. Of these, 36 are Experienced, 17 are Advanced and 1 are Distinguished.

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54 providers found
    Advanced in Methylmalonic Acidemia with Homocystinuria
    Medical Genetics
    Advanced in Methylmalonic Acidemia with Homocystinuria
    Medical Genetics
    1201 West La Veta Avenue, 
    Orange, CA 
     (0.8 miles away)
    Languages Spoken:
    English
    Accepting New Patients

    Cristel Chapel is a Medical Genetics provider in Orange, California. Dr. Chapel is rated as an Advanced provider by MediFind in the treatment of Methylmalonic Acidemia with Homocystinuria. Her top areas of expertise are CLN4 Disease, CLN2 Disease, CLN3 Disease, and CLN5 Disease. Dr. Chapel is currently accepting new patients.

    Raymond Y. Wang
    Experienced in Methylmalonic Acidemia with Homocystinuria
    Medical Genetics
    Experienced in Methylmalonic Acidemia with Homocystinuria
    Medical Genetics
    1201 West La Veta Avenue, 
    Orange, CA 
     (0.8 miles away)
    Languages Spoken:
    English

    Raymond Wang is a Medical Genetics provider in Orange, California. Dr. Wang is rated as an Experienced provider by MediFind in the treatment of Methylmalonic Acidemia with Homocystinuria. His top areas of expertise are Mucopolysaccharidoses (MPS), Mucopolysaccharidosis Type 7 (MPS VII, Sly Syndrome), Mucopolysaccharidosis Type 1 (MPS I, Hurler Syndrome), Pompe Disease, and Adenoidectomy.

    Distinguished in Methylmalonic Acidemia with Homocystinuria
    General Practice
    Distinguished in Methylmalonic Acidemia with Homocystinuria
    General Practice

    Tustin Longevity Center

    13422 Newport Ave Ste L, 
    Tustin, CA 
     (4.3 miles away)
    Experience:
    44+ years
    Languages Spoken:
    English
    Offers Telehealth

    Rita Ellithorpe is a primary care provider, practicing in General Practice in Tustin, California. Dr. Ellithorpe has been practicing medicine for over 44 years and is rated as a Distinguished provider by MediFind in the treatment of Methylmalonic Acidemia with Homocystinuria. Her top areas of expertise are Heavy Metal Poisoning, Menopause, Homocystinuria, and Methylmalonic Acidemia with Homocystinuria.

    Learn about our expert tiers
    Experienced in Methylmalonic Acidemia with Homocystinuria
    Medical Genetics
    Experienced in Methylmalonic Acidemia with Homocystinuria
    Medical Genetics
    1201 West La Veta Avenue, 
    Orange, CA 
     (0.8 miles away)
    Languages Spoken:
    English
    Accepting New Patients

    Richard Chang is a Medical Genetics provider in Orange, California. Dr. Chang is rated as an Experienced provider by MediFind in the treatment of Methylmalonic Acidemia with Homocystinuria. His top areas of expertise are Phenylketonuria (PKU), Maternal Hyperphenylalaninemia, Arginase Deficiency, and Urea Cycle Disorders (UCD). Dr. Chang is currently accepting new patients.

    Experienced in Methylmalonic Acidemia with Homocystinuria
    Medical Genetics
    Experienced in Methylmalonic Acidemia with Homocystinuria
    Medical Genetics
    1201 West La Veta Avenue, 
    Orange, CA 
     (0.8 miles away)
    Languages Spoken:
    English
    Accepting New Patients
    Offers Telehealth

    Changrui Xiao is a Medical Genetics provider in Orange, California. Dr. Xiao is rated as an Experienced provider by MediFind in the treatment of Methylmalonic Acidemia with Homocystinuria. His top areas of expertise are Glutaric Acidemia Type 2, Retinopathy Pigmentary Mental Retardation, Adrenoleukodystrophy (ALD), and X-Linked Creatine Deficiency. Dr. Xiao is currently accepting new patients.

    Advanced in Methylmalonic Acidemia with Homocystinuria
    Internal Medicine
    Advanced in Methylmalonic Acidemia with Homocystinuria
    Internal Medicine

    Optum - Chapman

    845 E Chapman Ave, 
    Orange, CA 
     (0.6 miles away)
    Experience:
    44+ years
    Languages Spoken:
    English

    Thomas Hryniewicki is a primary care provider, practicing in Internal Medicine in Orange, California. Dr. Hryniewicki has been practicing medicine for over 44 years and is rated as an Advanced provider by MediFind in the treatment of Methylmalonic Acidemia with Homocystinuria. His top areas of expertise are Purpura, Autoerythrocyte Sensitivity, Gardner-Diamond Syndrome, and Cirrhosis.

    Advanced in Methylmalonic Acidemia with Homocystinuria
    Internal Medicine
    Advanced in Methylmalonic Acidemia with Homocystinuria
    Internal Medicine
    1240 East Chapman Avenue, 
    Orange, CA 
     (0.6 miles away)
    Languages Spoken:
    English

    Pravin Sharma is a primary care provider, practicing in Internal Medicine in Orange, California. Dr. Sharma is rated as an Advanced provider by MediFind in the treatment of Methylmalonic Acidemia with Homocystinuria. His top areas of expertise are Heart Murmurs, Sitosterolemia, High Cholesterol, and Nasal Flaring.

    Advanced in Methylmalonic Acidemia with Homocystinuria
    Family Medicine
    Advanced in Methylmalonic Acidemia with Homocystinuria
    Family Medicine

    Popular Medical Clinic Inc

    420 S Bristol St, 
    Santa Ana, CA 
     (3.6 miles away)
    Experience:
    26+ years
    Languages Spoken:
    English

    Jose Cilliani is a primary care provider, practicing in Family Medicine in Santa Ana, California. Dr. Cilliani has been practicing medicine for over 26 years and is rated as an Advanced provider by MediFind in the treatment of Methylmalonic Acidemia with Homocystinuria. His top areas of expertise are Vitamin D Deficiency, Osteomyelitis in Children, Homocystinuria, and Methylmalonic Acidemia with Homocystinuria.

    Experienced in Methylmalonic Acidemia with Homocystinuria
    Family Medicine
    Experienced in Methylmalonic Acidemia with Homocystinuria
    Family Medicine
    845 East Chapman Avenue, 
    Orange, CA 
     (0.6 miles away)
    Languages Spoken:
    English
    Accepting New Patients

    Hal Shimazu is a primary care provider, practicing in Family Medicine in Orange, California. Dr. Shimazu is rated as an Experienced provider by MediFind in the treatment of Methylmalonic Acidemia with Homocystinuria. His top areas of expertise are High Cholesterol, Cirrhosis, Purpura, and Autoerythrocyte Sensitivity. Dr. Shimazu is currently accepting new patients.

    Experienced in Methylmalonic Acidemia with Homocystinuria
    Family Medicine
    Experienced in Methylmalonic Acidemia with Homocystinuria
    Family Medicine

    Pavilion Family Physicians

    1140 W La Veta Ave, 
    Orange, CA 
     (0.8 miles away)
    Experience:
    36+ years
    Languages Spoken:
    English

    Catherine Garcia is a primary care provider, practicing in Family Medicine in Orange, California. Dr. Garcia has been practicing medicine for over 36 years and is rated as an Experienced provider by MediFind in the treatment of Methylmalonic Acidemia with Homocystinuria. Her top areas of expertise are Type 2 Diabetes (T2D), Osteomyelitis in Children, Hypertension, High Cholesterol, and Carotid Artery Surgery.

    Experienced in Methylmalonic Acidemia with Homocystinuria
    Medical Genetics
    Experienced in Methylmalonic Acidemia with Homocystinuria
    Medical Genetics
    1201 W La Veta Ave, 
    Orange, CA 
     (0.8 miles away)
    Languages Spoken:
    English
    Accepting New Patients

    Walla Al-Hertani is a Medical Genetics provider in Orange, California. Dr. Al-Hertani is rated as an Experienced provider by MediFind in the treatment of Methylmalonic Acidemia with Homocystinuria. Her top areas of expertise are Von Gierke Disease, Classic Galactosemia, Phosphoglycerate Mutase Deficiency, and Glycogen Storage Disease Type 7. Dr. Al-Hertani is currently accepting new patients.

    Experienced in Methylmalonic Acidemia with Homocystinuria
    Internal Medicine
    Experienced in Methylmalonic Acidemia with Homocystinuria
    Internal Medicine

    Uc Irvine Hospitalist Program

    101 The City Dr S, 
    Orange, CA 
     (2.0 miles away)
    Languages Spoken:
    English

    Nicole Chow is a primary care provider, practicing in Internal Medicine in Orange, California. Dr. Chow is rated as an Experienced provider by MediFind in the treatment of Methylmalonic Acidemia with Homocystinuria. Her top areas of expertise are Homocystinuria, Methylmalonic Acidemia with Homocystinuria, Acne, and Cirrhosis.

    Experienced in Methylmalonic Acidemia with Homocystinuria
    Medical Genetics | Pediatrics
    Experienced in Methylmalonic Acidemia with Homocystinuria
    Medical Genetics | Pediatrics

    Uc Regents Uci Dept Of Pediatrics

    101 The City Dr S, 
    Orange, CA 
     (2.0 miles away)
    Languages Spoken:
    English

    Natalie Gallant is a Medical Genetics specialist and a Pediatrics provider in Orange, California. Dr. Gallant is rated as an Experienced provider by MediFind in the treatment of Methylmalonic Acidemia with Homocystinuria. Her top areas of expertise are Chromosome 8p Deletion, Chromosome 6q Duplication, Microcephaly, and Microcephaly Deafness Syndrome.

    Experienced in Methylmalonic Acidemia with Homocystinuria
    Internal Medicine
    Experienced in Methylmalonic Acidemia with Homocystinuria
    Internal Medicine

    Optum - Orange

    2540 N Santiago Blvd, 
    Orange, CA 
     (3.2 miles away)
    Experience:
    34+ years
    Languages Spoken:
    English
    Offers Telehealth

    James Burris is a primary care provider, practicing in Internal Medicine in Orange, California. Dr. Burris has been practicing medicine for over 34 years and is rated as an Experienced provider by MediFind in the treatment of Methylmalonic Acidemia with Homocystinuria. His top areas of expertise are Familial Combined Hyperlipidemia, Xanthoma, Cirrhosis, and High Cholesterol.

    Experienced in Methylmalonic Acidemia with Homocystinuria
    Internal Medicine
    Experienced in Methylmalonic Acidemia with Homocystinuria
    Internal Medicine

    Office

    14411 Brookhurst St Ste D, 
    Garden Grove, CA 
     (4.7 miles away)
    Languages Spoken:
    English
    Offers Telehealth

    Philip Lynn is a primary care provider, practicing in Internal Medicine in Garden Grove, California. Dr. Lynn is rated as an Experienced provider by MediFind in the treatment of Methylmalonic Acidemia with Homocystinuria. His top areas of expertise are Homocystinuria, Methylmalonic Acidemia with Homocystinuria, Inborn Amino Acid Metabolism Disorder, and Type 2 Diabetes (T2D).

    Advanced in Methylmalonic Acidemia with Homocystinuria
    Internal Medicine
    Advanced in Methylmalonic Acidemia with Homocystinuria
    Internal Medicine

    Brandon Richland MD Inc.

    9900 Talbert Ave, 
    Fountain Valley, CA 
     (8.3 miles away)
    Languages Spoken:
    English

    Victor Lin is a primary care provider, practicing in Internal Medicine in Fountain Valley, California. Dr. Lin is rated as an Advanced provider by MediFind in the treatment of Methylmalonic Acidemia with Homocystinuria. His top areas of expertise are Homocystinuria, Methylmalonic Acidemia with Homocystinuria, Inborn Amino Acid Metabolism Disorder, and Chronic B-Cell Leukemia (CBCL).

    Advanced in Methylmalonic Acidemia with Homocystinuria
    Internal Medicine
    Advanced in Methylmalonic Acidemia with Homocystinuria
    Internal Medicine

    Office

    9900 Talbert Ave Ste 302, 
    Fountain Valley, CA 
     (8.3 miles away)
    Languages Spoken:
    English

    Douglas Mcconnaughey is a primary care provider, practicing in Internal Medicine in Fountain Valley, California. Dr. Mcconnaughey is rated as an Advanced provider by MediFind in the treatment of Methylmalonic Acidemia with Homocystinuria. His top areas of expertise are Homocystinuria, Methylmalonic Acidemia with Homocystinuria, Inborn Amino Acid Metabolism Disorder, and Cirrhosis.

    Advanced in Methylmalonic Acidemia with Homocystinuria
    Internal Medicine
    Advanced in Methylmalonic Acidemia with Homocystinuria
    Internal Medicine

    Office

    9900 Talbert Ave Ste 302, 
    Fountain Valley, CA 
     (8.3 miles away)
    Languages Spoken:
    English

    Tamara Fogarty is a primary care provider, practicing in Internal Medicine in Fountain Valley, California. Dr. Fogarty is rated as an Advanced provider by MediFind in the treatment of Methylmalonic Acidemia with Homocystinuria. Her top areas of expertise are Homocystinuria, Methylmalonic Acidemia with Homocystinuria, Hypoparathyroidism, and Inborn Amino Acid Metabolism Disorder.

    Advanced in Methylmalonic Acidemia with Homocystinuria
    Internal Medicine
    Advanced in Methylmalonic Acidemia with Homocystinuria
    Internal Medicine

    Optum - Weir Canyon

    781 S Weir Canyon Rd, 
    Anaheim, CA 
     (8.4 miles away)
    Experience:
    12+ years
    Languages Spoken:
    English
    Offers Telehealth

    Pratik Gandhi is a primary care provider, practicing in Internal Medicine in Anaheim, California. Dr. Gandhi has been practicing medicine for over 12 years and is rated as an Advanced provider by MediFind in the treatment of Methylmalonic Acidemia with Homocystinuria. His top areas of expertise are Hypothyroidism, High Cholesterol, Obesity in Children, and Multiple Carboxylase Deficiency.

    Experienced in Methylmalonic Acidemia with Homocystinuria
    Family Medicine
    Experienced in Methylmalonic Acidemia with Homocystinuria
    Family Medicine

    Khanh Bao Nguyen MD Inc

    13830 Brookhurst St, 
    Garden Grove, CA 
     (5.9 miles away)
    Experience:
    30+ years
    Languages Spoken:
    English

    Khanh Nguyen is a primary care provider, practicing in Family Medicine in Garden Grove, California. Dr. Nguyen has been practicing medicine for over 30 years and is rated as an Experienced provider by MediFind in the treatment of Methylmalonic Acidemia with Homocystinuria. His top areas of expertise are Vitamin D Deficiency, Osteomyelitis in Children, High Cholesterol, and Type 2 Diabetes (T2D).

    Showing 1-20 of 54

    Last Updated: 04/28/2026

    What is the definition of Methylmalonic Acidemia with Homocystinuria?

    Methylmalonic acidemia with homocystinuria is a disorder in which the body is unable to correctly process certain protein building blocks (amino acids), fat building blocks (fatty acids), and  cholesterol. The body is also unable to convert the amino acid homocysteine to another amino acid, methionine. Individuals with this disorder have a combination of features from two separate conditions, methylmalonic acidemia and homocystinuria. There are several forms of this combined condition, and the different forms have different genetic causes and signs and symptoms. The most common and best understood form, called cblC type (or cobalamin C disease), occurs in about 80 percent of affected individuals.

    When should I see a Methylmalonic Acidemia with Homocystinuria doctor near Orange, 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 Methylmalonic Acidemia with Homocystinuria doctor near Orange, 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 Methylmalonic Acidemia with Homocystinuria doctors near Orange, 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 Methylmalonic Acidemia with Homocystinuria doctors near Orange, 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 Methylmalonic Acidemia with Homocystinuria doctor near Orange, 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 Methylmalonic Acidemia with Homocystinuria doctor search results page. 

    Why is it important to get a second opinion from a different Methylmalonic Acidemia with Homocystinuria 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 Methylmalonic Acidemia with Homocystinuria doctor near Orange, 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 Methylmalonic Acidemia with Homocystinuria 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 Methylmalonic Acidemia with Homocystinuria 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 Methylmalonic Acidemia with Homocystinuria doctors near Orange, CA?

    Look for the filter feature on the left side of the Methylmalonic Acidemia with Homocystinuria 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 Methylmalonic Acidemia with Homocystinuria doctor that offers video calls?

    Look for the filter feature on the left-side of the Methylmalonic Acidemia with Homocystinuria 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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