The 20 Best Idiopathic Hypersomnia Doctors in Japan

Find the Top Idiopathic Hypersomnia Experts and Specialists

Last Updated: 06/30/2026

Save doctors for later
Sign Up
Not sure about your diagnosis?
Check Your Symptoms
Already have a doctor?
Find A Second Opinion

MediFind found 131 doctor with experience in Idiopathic Hypersomnia near Japan. Of these, 107 are Experienced, 15 are Advanced and 9 are Distinguished.

Location
LocationClose
131 providers found
    Distinguished in Idiopathic Hypersomnia

    Takashi Kanbayashi
    Distinguished in Idiopathic Hypersomnia

    Takashi Kanbayashi
    Referral may be required
    Tsukuba, JP 

    Takashi Kanbayashi practices practicing medicine in Tsukuba, Japan. Mr. Kanbayashi is rated as a Distinguished expert by MediFind in the treatment of Idiopathic Hypersomnia. He is also highly rated in 11 other conditions, according to our data. His clinical expertise encompasses Drowsiness, Narcolepsy, Idiopathic Hypersomnia, and Excessive Daytime Sleepiness.

    Distinguished in Idiopathic Hypersomnia

    Katsushi Tokunaga
    Distinguished in Idiopathic Hypersomnia

    Katsushi Tokunaga
    Referral may be required
    Tokyo, JP 

    Katsushi Tokunaga practices practicing medicine in Tokyo, Japan. Tokunaga is rated as a Distinguished expert by MediFind in the treatment of Idiopathic Hypersomnia. They are also highly rated in 18 other conditions, according to our data. Their clinical expertise encompasses Stevens-Johnson Syndrome, Erythema Multiforme, Excessive Daytime Sleepiness, and Narcolepsy.

    Distinguished in Idiopathic Hypersomnia

    Kazuo Mishima
    Distinguished in Idiopathic Hypersomnia

    Kazuo Mishima
    Referral may be required
    Akita, JP 

    Kazuo Mishima practices practicing medicine in Akita, Japan. Mr. Mishima is rated as a Distinguished expert by MediFind in the treatment of Idiopathic Hypersomnia. He is also highly rated in 5 other conditions, according to our data. His clinical expertise encompasses Excessive Daytime Sleepiness, Idiopathic Hypersomnia, Drowsiness, and Insomnia.

    Learn about our expert tiers
    Distinguished in Idiopathic Hypersomnia

    Aya Imanishi
    Distinguished in Idiopathic Hypersomnia

    Aya Imanishi
    Referral may be required
    Akita, JP 

    Aya Imanishi practices practicing medicine in Akita, Japan. Ms. Imanishi is rated as a Distinguished expert by MediFind in the treatment of Idiopathic Hypersomnia. She is also highly rated in 6 other conditions, according to our data. Her clinical expertise encompasses Drowsiness, Narcolepsy, Idiopathic Hypersomnia, and Excessive Daytime Sleepiness.

    Distinguished in Idiopathic Hypersomnia

    Masaya Honda
    Distinguished in Idiopathic Hypersomnia

    Masaya Honda
    Referral may be required
    Ube, JP 

    Masaya Honda practices practicing medicine in Ube, Japan. Mr. Honda is rated as a Distinguished expert by MediFind in the treatment of Idiopathic Hypersomnia. He is also highly rated in 6 other conditions, according to our data. His clinical expertise encompasses Excessive Daytime Sleepiness, Drowsiness, Narcolepsy, Idiopathic Hypersomnia, and Thymectomy.

    Distinguished in Idiopathic Hypersomnia

    Makoto Honda
    Distinguished in Idiopathic Hypersomnia

    Makoto Honda
    Referral may be required
    Tokyo, JP 

    Makoto Honda practices practicing medicine in Tokyo, Japan. Mr. Honda is rated as a Distinguished expert by MediFind in the treatment of Idiopathic Hypersomnia. He is also highly rated in 4 other conditions, according to our data. His clinical expertise encompasses Drowsiness, Narcolepsy, Excessive Daytime Sleepiness, and Idiopathic Hypersomnia.

    Distinguished in Idiopathic Hypersomnia

    Yuichi U. Inoue
    Distinguished in Idiopathic Hypersomnia

    Yuichi U. Inoue
    Referral may be required
    Tokyo, JP 

    Yuichi Inoue practices practicing medicine in Tokyo, Japan. Inoue is rated as a Distinguished expert by MediFind in the treatment of Idiopathic Hypersomnia. They are also highly rated in 13 other conditions, according to our data. Their clinical expertise encompasses Restless Legs Syndrome, Excessive Daytime Sleepiness, Drowsiness, and Insomnia.

    Distinguished in Idiopathic Hypersomnia

    Yohei Sagawa
    Distinguished in Idiopathic Hypersomnia

    Yohei Sagawa
    Referral may be required
    Akita, JP 

    Yohei Sagawa practices practicing medicine in Akita, Japan. Mr. Sagawa is rated as a Distinguished expert by MediFind in the treatment of Idiopathic Hypersomnia. He is also highly rated in 5 other conditions, according to our data. His clinical expertise encompasses Drowsiness, Narcolepsy, Idiopathic Hypersomnia, and Niemann-Pick Disease.

    Distinguished in Idiopathic Hypersomnia

    Yoshikazu Inoue
    Distinguished in Idiopathic Hypersomnia

    Yoshikazu Inoue
    Referral may be required
    Neyagawa, JP 

    Yoshikazu Inoue practices practicing medicine in Neyagawa, Japan. Mr. Inoue is rated as a Distinguished expert by MediFind in the treatment of Idiopathic Hypersomnia. He is also highly rated in 34 other conditions, according to our data. His clinical expertise encompasses Pulmonary Alveolar Proteinosis, Interstitial Lung Disease, Acute Interstitial Pneumonia, Hepatectomy, and Mastectomy.

    Advanced in Idiopathic Hypersomnia

    Shinya I. Kimura
    Advanced in Idiopathic Hypersomnia

    Shinya I. Kimura
    Referral may be required
    Saga, JP 

    Shinya Kimura practices practicing medicine in Saga, Japan. Mr. Kimura is rated as an Advanced expert by MediFind in the treatment of Idiopathic Hypersomnia. He is also highly rated in 12 other conditions, according to our data. His clinical expertise encompasses Chronic Myelogenous Leukemia (CML), Leukemia, Adult T-Cell Leukemia, Bone Marrow Transplant, and Bone Marrow Aspiration.

    Advanced in Idiopathic Hypersomnia

    Taku Miyagawa
    Advanced in Idiopathic Hypersomnia

    Taku Miyagawa
    Referral may be required
    Tokyo, JP 

    Taku Miyagawa practices practicing medicine in Tokyo, Japan. Mr. Miyagawa is rated as an Advanced expert by MediFind in the treatment of Idiopathic Hypersomnia. He is also highly rated in 4 other conditions, according to our data. His clinical expertise encompasses Drowsiness, Narcolepsy, Excessive Daytime Sleepiness, and Idiopathic Hypersomnia.

    Advanced in Idiopathic Hypersomnia

    Ko Tsutsui
    Advanced in Idiopathic Hypersomnia

    Ko Tsutsui
    Referral may be required
    Akita, JP 

    Ko Tsutsui practices practicing medicine in Akita, Japan. Tsutsui is rated as an Advanced expert by MediFind in the treatment of Idiopathic Hypersomnia. They are also highly rated in 6 other conditions, according to our data. Their clinical expertise encompasses Drowsiness, Narcolepsy, Idiopathic Hypersomnia, and Anti-NMDA Receptor Encephalitis.

    Advanced in Idiopathic Hypersomnia

    Masataka Wada
    Advanced in Idiopathic Hypersomnia

    Masataka Wada
    Referral may be required
    Sapporo, JP 

    Masataka Wada practices practicing medicine in Sapporo, Japan. Mr. Wada is rated as an Advanced expert by MediFind in the treatment of Idiopathic Hypersomnia. He is also highly rated in 3 other conditions, according to our data. His clinical expertise encompasses Idiopathic Hypersomnia, Drowsiness, Gastroenteropancreatic Neuroendocrine Tumor (GEP-NET), Pancreaticoduodenectomy, and Hepatectomy.

    Advanced in Idiopathic Hypersomnia

    Wakako Ito
    Advanced in Idiopathic Hypersomnia

    Wakako Ito
    Referral may be required
    Tokyo, JP 

    Wakako Ito practices practicing medicine in Tokyo, Japan. Ito is rated as an Advanced expert by MediFind in the treatment of Idiopathic Hypersomnia. They are also highly rated in 4 other conditions, according to our data. Their clinical expertise encompasses Drowsiness, Narcolepsy, Idiopathic Hypersomnia, and Teratoma of the Mediastinum.

    Advanced in Idiopathic Hypersomnia

    Yuhei Kikuchi
    Advanced in Idiopathic Hypersomnia

    Yuhei Kikuchi
    Referral may be required
    Tokyo, JP 

    Yuhei Kikuchi practices practicing medicine in Tokyo, Japan. Kikuchi is rated as an Advanced expert by MediFind in the treatment of Idiopathic Hypersomnia. They are also highly rated in 3 other conditions, according to our data. Their clinical expertise encompasses Narcolepsy, Drowsiness, Idiopathic Hypersomnia, and Autism Spectrum Disorder.

    Advanced in Idiopathic Hypersomnia

    Mihoko Shimada
    Advanced in Idiopathic Hypersomnia

    Mihoko Shimada
    Referral may be required
    Tokyo, JP 

    Mihoko Shimada practices practicing medicine in Tokyo, Japan. Shimada is rated as an Advanced expert by MediFind in the treatment of Idiopathic Hypersomnia. They are also highly rated in 4 other conditions, according to our data. Their clinical expertise encompasses Drowsiness, Narcolepsy, Excessive Daytime Sleepiness, and Idiopathic Hypersomnia.

    Advanced in Idiopathic Hypersomnia

    Koichi Hirata
    Advanced in Idiopathic Hypersomnia

    Koichi Hirata
    Referral may be required
    Mibu, JP 

    Koichi Hirata practices practicing medicine in Mibu, Japan. Mr. Hirata is rated as an Advanced expert by MediFind in the treatment of Idiopathic Hypersomnia. He is also highly rated in 33 other conditions, according to our data. His clinical expertise encompasses Restless Legs Syndrome, Migraine, Headache, Hepato-Pancreato-Biliary Surgery, and Pancreaticoduodenectomy.

    Advanced in Idiopathic Hypersomnia

    Kenichi Hayashida
    Advanced in Idiopathic Hypersomnia

    Kenichi Hayashida
    Referral may be required
    Higashioi, JP 

    Kenichi Hayashida practices practicing medicine in Higashioi, Japan. Mr. Hayashida is rated as an Advanced expert by MediFind in the treatment of Idiopathic Hypersomnia. He is also highly rated in 3 other conditions, according to our data. His clinical expertise encompasses Narcolepsy, Drowsiness, Idiopathic Hypersomnia, and Insomnia.

    Advanced in Idiopathic Hypersomnia

    Yuichi Kamei
    Advanced in Idiopathic Hypersomnia

    Yuichi Kamei
    Referral may be required
    Suwa, JP 

    Yuichi Kamei practices practicing medicine in Suwa, Japan. Kamei is rated as an Advanced expert by MediFind in the treatment of Idiopathic Hypersomnia. They are also highly rated in 2 other conditions, according to our data. Their clinical expertise encompasses Excessive Daytime Sleepiness, Idiopathic Hypersomnia, Drowsiness, and Narcolepsy.

    Advanced in Idiopathic Hypersomnia

    Masayuki Miyamoto
    Advanced in Idiopathic Hypersomnia

    Masayuki Miyamoto
    Referral may be required
    Tochigi, JP 

    Masayuki Miyamoto practices practicing medicine in Tochigi, Japan. Mr. Miyamoto is rated as an Advanced expert by MediFind in the treatment of Idiopathic Hypersomnia. He is also highly rated in 12 other conditions, according to our data. His clinical expertise encompasses Restless Legs Syndrome, REM Behavior Disorder, Excessive Daytime Sleepiness, and Lewy Body Dementia (LBD).

    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 131

    Last Updated: 06/30/2026

    What is the definition of Idiopathic Hypersomnia?

    Idiopathic hypersomnia (IH) is a neurological sleep disorder that can affect many aspects of a person's life. Symptoms often begin between adolescence and young adulthood and develop over weeks to months. People with IH have a hard time staying awake and alert during the day (chronic excessive daytime sleepiness). They may fall asleep unintentionally or at inappropriate times, interfering with daily functioning. They may also have difficulty waking up from nighttime sleep or daytime naps. Sleeping longer at night does not appear to improve daytime sleepiness. The cause of IH is not known. Some people with IH have other family members with a sleep disorder such as IH or narcolepsy.

    When should I see an Idiopathic Hypersomnia 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 an Idiopathic Hypersomnia 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 Idiopathic Hypersomnia doctor in Japan?

    You can find an Idiopathic Hypersomnia doctor in any of the 10 largest U.S. cities by clicking below:

    Idiopathic Hypersomnia doctor near New York, NY
    Idiopathic Hypersomnia doctor near Los Angeles, CA
    Idiopathic Hypersomnia doctor near Chicago, IL
    Idiopathic Hypersomnia doctor near Houston, TX
    Idiopathic Hypersomnia doctor near Phoenix, AZ
    Idiopathic Hypersomnia doctor near Philadelphia, PA
    Idiopathic Hypersomnia doctor near Atlanta, GA
    Idiopathic Hypersomnia doctor near Boston, MA
    Idiopathic Hypersomnia doctor near Dallas, TX
    Idiopathic Hypersomnia doctor near San Jose, CA

    How does MediFind rank Idiopathic Hypersomnia 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 Idiopathic Hypersomnia 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 an Idiopathic Hypersomnia 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 Idiopathic Hypersomnia doctor search results page. 

    Why is it important to get a second opinion from a different Idiopathic Hypersomnia 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 an Idiopathic Hypersomnia 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 Idiopathic Hypersomnia 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 Idiopathic Hypersomnia 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 Idiopathic Hypersomnia doctors in Japan?

    Look for the filter feature on the left side of the Idiopathic Hypersomnia 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 an Idiopathic Hypersomnia doctor that offers video calls?

    Look for the filter feature on the left-side of the Idiopathic Hypersomnia 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 

    Read more about our Content Policy.