64.28

Million
Patients

Hospital Database

(Last updated: July 2026)
[Data availability: April 2008 to end of May 2026]
The start date of available data varies by hospital.
Hospital data is a compilation of receipt and DPC data allocated to a single patient ID registered in the medical institution, allowing longitudinal tracking of treatments and disease progression within that hospital.

21.02

Million
Patients

Health Insurance
Database

(Last updated: December 2023)
[Data availability: April 2012 to end of September 2023]

Database Insights &
Rankings

We analyze Japan’s largest hospital database to deliver regularly updated rankings and key trends each month.

①-1 Top 10 Comorbidities in DPC Data (July 2025- June 2026)
ICD 10 Code ICD 10 Category Name Actual Number of Patients
1 I10 Essential (primary) hypertension 1,450,802
2 E78 Disorders of lipoprotein metabolism and other lipidaemias 1,073,456
3 K21 Gastro-oesophageal reflux disease 1,048,283
4 K59 Other functional intestinal disorders 957,252
5 K29 Gastritis and duodenitis 783,195
①-2 Top 10 Comorbidities in Health Insurance Data (June 2025-May 2026)
ICD 10 Code ICD 10 Category Name Actual Number of Patients
1 J30 Vasomotor and allergic rhinitis 618,299
2 J06 Acute upper respiratory infections of multiple and unspecified sites 517,615
3 J20 Acute bronchitis 443,814
4 H52 Disorders of refraction and accommodation 409,367
5 H10 Conjunctivitis 338,613
②-1 Top 10 Respiratory Diseases in DPC Data (July 2025-June 2026)
ICD 10 Code ICD 10 Category Name Actual Number of Patients
1 I10 Essential (primary) hypertension 488,788
2 J30 Vasomotor and allergic rhinitis 450,989
3 K21 Gastro-oesophageal reflux disease 412,335
4 K59 Other functional intestinal disorders 363,574
5 E78 Disorders of lipoprotein metabolism and other lipidaemias 352,547
②-2 Top 10 Respiratory Diseases in Health Insurance Data (June 2025-May 2026)
ICD 10 Code ICD 10 Category Name Actual Number of Patients
1 J30 Vasomotor and allergic rhinitis 618,299
2 J06 Acute upper respiratory infections of multiple and unspecified sites 517,615
3 J20 Acute bronchitis 443,814
4 J02 Acute pharyngitis 306,080
5 J45 Asthma 264,926

FAQ

Answers to frequently asked questions about MDV’s real-world clinical data.

No. Our databases includes both inpatient and outpatient insurance claims data.
While there are approximately 8,000 hospitals in Japan, 1,685 hospitals (roughly 20%) are designated as DPC hospitals as of June 2026.
DPC stands for Diagnosis Procedure Combination. Unlike the traditional fee for service reimbursement model, the DPC system is a flat sum reimbursement scheme for inpatient care. Medical fees are calculated using fixed daily rates determined by the MHLW (Ministry of Health, Labour and Welfare), based on the patient’s diagnosis, disease severity, presence of surgery or complications, and details of the treatments provided.
Hospitals designated under the DPC system are also required to submit DPC data to the MHLW on a quarterly basis.
Yes. Through our Health Insurance Database, data from clinic visits are also available. Beside providing insurance claim data from DPC hospitals, MDV is also supplying data from the Health Insurance Societies and National Health Insurance thanks to partnership with external providers.
Each DPC hospital assigns a unique ID to each patient, so it is possible to track both inpatient and outpatient visits within the same DPC hospital, but it is not possible to track patients after they have been transferred to another hospital.

CONTACT US

For any questions about our RWD services or clinical databases, please feel free to get in touch.

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