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62.42

Million
Patients

Hospital Database

(Last updated: May 2026)
[Data availability: April 2008 to end of March 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]

822

Publications

Peer-Reviewed
Publications

A list of peer-reviewed research articles published using our databases.

View publications

Acute heart failure

antihypertensive

Asthma

Atrial fibrillation

Breast cancer

Chronic kidney disease

Chronic obstructive pulmonary disease

Colorectal cancer

COVID-19

Diabetes

Diffuse large B-cell lymphoma

Gastric cancer

Heart failure

HIV

Hyperkalaemia

Lung cancer

Mantle cell lymphoma

Multiple myeloma

Multiple sclerosis

Non-small cell lung cancer

Non-valvular atrial fibrillation

Osteoporosis

Pancreatic cancer

Parenteral nutrition

Parkinson’s disease

pneumonia

Prostate cancer

Rheumatoid arthritis

Sepsis

Type 2 diabetes

Ulcerative colitis

Venous thromboembolism

Database Insights &
Rankings

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

See full list
①-1　Top 10 Comorbidities in DPC Data (April 2025- March 2026)
ICD 10 Code ICD 10 Category Name Actual Number of Patients
1 I10 Essential (primary) hypertension 2,800,382
2 E78 Disorders of lipoprotein metabolism and other lipidaemias 2,068,527
3 K21 Gastro-oesophageal reflux disease 2,048,997
4 K59 Other functional intestinal disorders 1,929,479
5 K29 Gastritis and duodenitis 1,515,142
①-2　Top 10 Comorbidities in Health Insurance Data (March 2025-February 2026)
ICD 10 Code ICD 10 Category Name Actual Number of Patients
1 J30 Vasomotor and allergic rhinitis 580,547
2 J06 Acute upper respiratory infections of multiple and unspecified sites 494,864
3 J20 Acute bronchitis 427,229
4 H52 Disorders of refraction and accommodation 391,564
5 H10 Conjunctivitis 322,706
②-1　Top 10 Respiratory Diseases in DPC Data (Aplil 2025-March 2026)
ICD 10 Code ICD 10 Category Name Actual Number of Patients
1 I10 Essential (primary) hypertension 974,325
2 J30 Vasomotor and allergic rhinitis 930,075
3 K21 Gastro-oesophageal reflux disease 834,421
4 K59 Other functional intestinal disorders 754,082
5 E78 Disorders of lipoprotein metabolism and other lipidaemias 700,667
②-2　Top 10 Respiratory Diseases in Health Insurance Data (March 2025-February 2026)
ICD 10 Code ICD 10 Category Name Actual Number of Patients
1 J30 Vasomotor and allergic rhinitis 580,547
2 J06 Acute upper respiratory infections of multiple and unspecified sites 494,864
3 J20 Acute bronchitis 427,229
4 J02 Acute pharyngitis 293,329
5 J45 Asthma 255,130

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FAQ

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

No. Our databases includes both inpatient and outpatient insurance claims data.
As of May 1, 2026, our coverage includes 871 of the 1,761 DPC-designated hospitals in Japan.
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.

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