The 20 Best RASopathies Doctors in Japan

Find the Top RASopathies Experts and Specialists

Last Updated: 06/30/2026

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MediFind found 370 doctor with experience in RASopathies near Japan. Of these, 339 are Experienced, 19 are Advanced, 10 are Distinguished and 2 are Elite.

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370 providers found
    Elite in RASopathies

    Yoichi Matsubara
    Elite in RASopathies

    Yoichi Matsubara
    Referral may be required
    Osaka, JP 

    Yoichi Matsubara practices practicing medicine in Osaka, Japan. Mr. Matsubara is rated as an Elite expert by MediFind in the treatment of RASopathies. He is also highly rated in 17 other conditions, according to our data. His clinical expertise encompasses Costello Syndrome, RASopathies, Noonan Syndrome, Rommen Mueller Sybert Syndrome, and Trabeculectomy.

    Elite in RASopathies

    Tetsuya Niihori
    Elite in RASopathies

    Tetsuya Niihori
    Referral may be required
    Sendai, JP 

    Tetsuya Niihori practices practicing medicine in Sendai, Japan. Mr. Niihori is rated as an Elite expert by MediFind in the treatment of RASopathies. He is also highly rated in 16 other conditions, according to our data. His clinical expertise encompasses Costello Syndrome, RASopathies, Linear Nevus Sebaceous Syndrome, and Noonan Syndrome.

    Distinguished in RASopathies

    Hirofumi T. Ohashi
    Distinguished in RASopathies

    Hirofumi T. Ohashi
    Referral may be required
    Okazaki, JP 

    Hirofumi Ohashi practices practicing medicine in Okazaki, Japan. Ohashi is rated as a Distinguished expert by MediFind in the treatment of RASopathies. They are also highly rated in 23 other conditions, according to our data. Their clinical expertise encompasses Costello Syndrome, RASopathies, Noonan Syndrome, Percutaneous Coronary Intervention (PCI), and Atherectomy.

    Are you looking for a specific type of RASopathies?

    Common conditions include: Cardiofaciocutaneous Syndrome, Cardiomyopathic Lentiginosis, Costello Syndrome, Legius Syndrome, Noonan Syndrome

    Learn about our expert tiers
    Distinguished in RASopathies

    Reiko Horikawa
    Distinguished in RASopathies

    Reiko Horikawa
    Referral may be required
    Tokyo, JP 

    Reiko Horikawa practices practicing medicine in Tokyo, Japan. Ms. Horikawa is rated as a Distinguished expert by MediFind in the treatment of RASopathies. She is also highly rated in 30 other conditions, according to our data. Her clinical expertise encompasses Pediatric Growth Hormone Deficiency, Growth Hormone Deficiency (GHD), Small for Gestational Age, Hormone Replacement Therapy (HRT), and Liver Transplant.

    Distinguished in RASopathies

    Yoko Aoki
    Distinguished in RASopathies

    Yoko Aoki
    Referral may be required
    Sendai, JP 

    Yoko Aoki practices practicing medicine in Sendai, Japan. Ms. Aoki is rated as a Distinguished expert by MediFind in the treatment of RASopathies. She is also highly rated in 16 other conditions, according to our data. Her clinical expertise encompasses RASopathies, Noonan Syndrome, Cavernous Lymphangioma, and Costello Syndrome.

    Distinguished in RASopathies

    Seiji Mizuno
    Distinguished in RASopathies

    Seiji Mizuno
    Referral may be required
    Kasugai, JP 

    Seiji Mizuno practices practicing medicine in Kasugai, Japan. Mr. Mizuno is rated as a Distinguished expert by MediFind in the treatment of RASopathies. He is also highly rated in 27 other conditions, according to our data. His clinical expertise encompasses Increased Head Circumference, Achalasia Microcephaly Syndrome, Microcephaly, and Kabuki Syndrome.

    Distinguished in RASopathies

    Hiroshi Kawame
    Distinguished in RASopathies

    Hiroshi Kawame
    Referral may be required
    Tokyo, JP 

    Hiroshi Kawame practices practicing medicine in Tokyo, Japan. Mr. Kawame is rated as a Distinguished expert by MediFind in the treatment of RASopathies. He is also highly rated in 6 other conditions, according to our data. His clinical expertise encompasses Costello Syndrome, RASopathies, Chromosome 6 Uniparental Disomy, and Noonan Syndrome.

    Distinguished in RASopathies

    Tsutomu Ogata
    Distinguished in RASopathies

    Tsutomu Ogata
    Referral may be required
    Hamamatsu, JP 

    Tsutomu Ogata practices practicing medicine in Hamamatsu, Japan. Mr. Ogata is rated as a Distinguished expert by MediFind in the treatment of RASopathies. He is also highly rated in 69 other conditions, according to our data. His clinical expertise encompasses Russell-Silver Dwarfism, Breast Enlargement In Males, Idiopathic Short Stature (ISS), Intersex, and Hormone Replacement Therapy (HRT).

    Distinguished in RASopathies

    Susumu Yokoya
    Distinguished in RASopathies

    Susumu Yokoya
    Referral may be required
    Fukushima, JP 

    Susumu Yokoya practices practicing medicine in Fukushima, Japan. Mr. Yokoya is rated as a Distinguished expert by MediFind in the treatment of RASopathies. He is also highly rated in 11 other conditions, according to our data. His clinical expertise encompasses Small for Gestational Age, Rommen Mueller Sybert Syndrome, Noonan Syndrome, Short Stature (Growth Disorders), and Hormone Replacement Therapy (HRT).

    Distinguished in RASopathies

    Nobuhiko Okamoto
    Distinguished in RASopathies

    Nobuhiko Okamoto
    Referral may be required
    Izumi, JP 

    Nobuhiko Okamoto practices practicing medicine in Izumi, Japan. Okamoto is rated as a Distinguished expert by MediFind in the treatment of RASopathies. They are also highly rated in 64 other conditions, according to our data. Their clinical expertise encompasses Bosma Arhinia Microphthalmia Syndrome, Micrognathia, Nicolaides-Baraitser Syndrome, Pancreaticoduodenectomy, and Endoscopy.

    Distinguished in RASopathies

    Tsuyoshi Isojima
    Distinguished in RASopathies

    Tsuyoshi Isojima
    Referral may be required
    Toranomon, JP 

    Tsuyoshi Isojima practices practicing medicine in Toranomon, Japan. Mr. Isojima is rated as a Distinguished expert by MediFind in the treatment of RASopathies. He is also highly rated in 16 other conditions, according to our data. His clinical expertise encompasses Nail-Patella Syndrome, Noonan Syndrome, Turner Syndrome, Caffey Disease, and Hormone Replacement Therapy (HRT).

    Distinguished in RASopathies

    Naotaka Okamoto
    Distinguished in RASopathies

    Naotaka Okamoto
    Referral may be required
    Osaka, JP 

    Naotaka Okamoto practices practicing medicine in Osaka, Japan. Okamoto is rated as a Distinguished expert by MediFind in the treatment of RASopathies. They are also highly rated in 25 other conditions, according to our data. Their clinical expertise encompasses Alpha Thalassemia X-Linked Intellectual Disability Syndrome, Cerebellar Hypoplasia, Atrial Fibrillation, Cardiac Ablation, and Atherectomy.

    Advanced in RASopathies

    Shin-ichi Inoue
    Advanced in RASopathies

    Shin-ichi Inoue
    Referral may be required
    Kumamoto, JP 

    Shin-ichi Inoue practices practicing medicine in Kumamoto, Japan. Mr. Inoue is rated as an Advanced expert by MediFind in the treatment of RASopathies. He is also highly rated in 8 other conditions, according to our data. His clinical expertise encompasses Cardiofaciocutaneous Syndrome, Ectodermal Dysplasias, Clouston Syndrome, and Aplasia Cutis Congenita.

    Advanced in RASopathies

    Naomichi Matsumoto
    Advanced in RASopathies

    Naomichi Matsumoto
    Referral may be required
    Crest, 
    Kawaguchi, JP 

    Naomichi Matsumoto practices practicing medicine in Kawaguchi, Japan. Matsumoto is rated as an Advanced expert by MediFind in the treatment of RASopathies. They are also highly rated in 156 other conditions, according to our data. Their clinical expertise encompasses West Syndrome, Coffin-Siris Syndrome, Neuronal Intranuclear Inclusion Disease (NIID), Pancreaticoduodenectomy, and Gastrostomy.

    Advanced in RASopathies

    Kenji Kurosawa
    Advanced in RASopathies

    Kenji Kurosawa
    Referral may be required
    Yokohama, JP 

    Kenji Kurosawa practices practicing medicine in Yokohama, Japan. Mr. Kurosawa is rated as an Advanced expert by MediFind in the treatment of RASopathies. He is also highly rated in 42 other conditions, according to our data. His clinical expertise encompasses Cerebellar Hypoplasia, Pelizaeus-Merzbacher Disease, Hypotonia, and Increased Head Circumference.

    Advanced in RASopathies

    Kenjiro Kosaki
    Advanced in RASopathies

    Kenjiro Kosaki
    Referral may be required
    Tokyo, JP 

    Kenjiro Kosaki practices practicing medicine in Tokyo, Japan. Mr. Kosaki is rated as an Advanced expert by MediFind in the treatment of RASopathies. He is also highly rated in 75 other conditions, according to our data. His clinical expertise encompasses Feingold Syndrome, Increased Head Circumference, Hypotonia, Oophorectomy, and Salpingo-Oophorectomy.

    Advanced in RASopathies

    Shigeo Kure
    Advanced in RASopathies

    Shigeo Kure
    Referral may be required
    Sendai, JP 

    Shigeo Kure practices practicing medicine in Sendai, Japan. Mr. Kure is rated as an Advanced expert by MediFind in the treatment of RASopathies. He is also highly rated in 28 other conditions, according to our data. His clinical expertise encompasses Galactokinase Deficiency, Galactose Epimerase Deficiency, Classic Galactosemia, and Galactosemia.

    Advanced in RASopathies

    Yasuhiro Ichikawa
    Advanced in RASopathies

    Yasuhiro Ichikawa
    Referral may be required
    Yokohama, JP 

    Yasuhiro Ichikawa practices practicing medicine in Yokohama, Japan. Mr. Ichikawa is rated as an Advanced expert by MediFind in the treatment of RASopathies. He is also highly rated in 4 other conditions, according to our data. His clinical expertise encompasses Noonan Syndrome, RASopathies, Pulmonary Valve Stenosis, and Patent Ductus Arteriosus.

    Advanced in RASopathies

    Taiki Abe
    Advanced in RASopathies

    Taiki Abe
    Referral may be required
    Sendai, JP 

    Taiki Abe practices practicing medicine in Sendai, Japan. Mr. Abe is rated as an Advanced expert by MediFind in the treatment of RASopathies. He is also highly rated in 3 other conditions, according to our data. His clinical expertise encompasses RASopathies, Costello Syndrome, Noonan Syndrome, and Acquired Amegakaryocytic Thrombocytopenia.

    Advanced in RASopathies

    Keiji Nishijima
    Advanced in RASopathies

    Keiji Nishijima
    Referral may be required
    Tokyo, JP 

    Keiji Nishijima practices practicing medicine in Tokyo, Japan. Mr. Nishijima is rated as an Advanced expert by MediFind in the treatment of RASopathies. He is also highly rated in 3 other conditions, according to our data. His clinical expertise encompasses Rommen Mueller Sybert Syndrome, Noonan Syndrome, RASopathies, and Short Stature (Growth Disorders).

    While we make every effort to provide the best results possible, data is currently limited outside of the United States. Doctors listed may include both clinicians and researchers, and individuals relocate frequently. We recommend contacting doctors directly to confirm their location and areas of focus. Contact information is provided when available. Learn more about our expert tiers.
    Showing 1-20 of 370

    Last Updated: 06/30/2026

    What is the definition of RASopathies?

    RASopathies are a group of rare syndromes causes by mutations in the genes that make proteins for the Ras/MAPK cell signaling pathway. This pathway controls cell functions such as cell growth, cell maturation, and cell death. There are several types of RASopathy syndromes, including cardiofaciocutaneous syndrome, Costello syndrome, Legius syndrome, neurofibromatosis type 1, Noonan syndrome, and capillary malformation-arteriovenous malformation syndrome.

    When should I see a RASopathies doctor in Japan?

    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 RASopathies doctor in Japan?

    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 do I find the best RASopathies doctor in Japan?

    You can find a RASopathies doctor in any of the 10 largest U.S. cities by clicking below:

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    How does MediFind rank RASopathies doctors in Japan?

    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 RASopathies doctors in Japan?

    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 RASopathies doctor in Japan?

    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 RASopathies doctor search results page. 

    Why is it important to get a second opinion from a different RASopathies 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 RASopathies doctor in Japan?

    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 RASopathies 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 RASopathies 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 RASopathies doctors in Japan?

    Look for the filter feature on the left side of the RASopathies 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 RASopathies doctor that offers video calls?

    Look for the filter feature on the left-side of the RASopathies 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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