*The survey was conducted among 221 psychiatric facilities across Japan. Attending doctors of 2,702 patients who received inpatient or outpatient treatments at respective facilities responded to the survey question.
Patients were diagnosed with mental and behavioral disorders due to psychoactive substance use, excluding alcohol use, based on the International Classification of Diseases, Tenth Revision (ICD-10-CM) designated by the World Health Organization (WHO.)
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Breakdown of drug-dependent patients based on diagnosis Japan 2024
According to a survey conducted from September to October 2024 in Japan, around **** percent of around 2,700 patients with mental and behavioral disorders related to drug abuse were diagnosed with ****. At the same time, about **** percent of patients were diagnosed with ***.
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National Institute of Mental Health. (May 11, 2025). Distribution of patients with drug abuse-related mental and behavioral disorders based on the classification of diagnosis in Japan in 2024 [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 27, 2026, from /statistics/1278655/japan-breakdown-drug-dependent-patients-diagnosis/
National Institute of Mental Health. "Distribution of patients with drug abuse-related mental and behavioral disorders based on the classification of diagnosis in Japan in 2024." Chart. May 11, 2025. ÌÇÐÄÆƽâ°æ. Accessed July 27, 2026. /statistics/1278655/japan-breakdown-drug-dependent-patients-diagnosis/
National Institute of Mental Health. (2025). Distribution of patients with drug abuse-related mental and behavioral disorders based on the classification of diagnosis in Japan in 2024. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 27, 2026. /statistics/1278655/japan-breakdown-drug-dependent-patients-diagnosis/
National Institute of Mental Health. "Distribution of Patients with Drug Abuse-related Mental and Behavioral Disorders Based on The Classification of Diagnosis in Japan in 2024." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 11 May 2025, /statistics/1278655/japan-breakdown-drug-dependent-patients-diagnosis/
National Institute of Mental Health, Distribution of patients with drug abuse-related mental and behavioral disorders based on the classification of diagnosis in Japan in 2024 ÌÇÐÄÆƽâ°æ, /statistics/1278655/japan-breakdown-drug-dependent-patients-diagnosis/ (last visited July 27, 2026)
Distribution of patients with drug abuse-related mental and behavioral disorders based on the classification of diagnosis in Japan in 2024 [Graph], National Institute of Mental Health, May 11, 2025. [Online]. Available: /statistics/1278655/japan-breakdown-drug-dependent-patients-diagnosis/
