Latest Rankings by Database

We update our monthly rankings using the most recent year of data extracted from each database.
These rankings offer insight into the scale of our DPC and insurer databases—the largest of their kind in Japan.

These rankings are aggregated using MDV analyzer, based on MDV’s medical databases. The DPC data covers approximately 28% of acute care (DPC) hospitals in Japan* and is notable for its extensive information on elderly patients.
The health insurance data features traceability across medical facilities,covering data from both the National Health Insurance and the Medical Care System For The Elderly.
*As of December 1, 2023.

MDV Database Overview

2026.03.05

Comorbidities

DPC Data (January 2025-December 2025)
	ICD 10 Code	ICD 10 Category Name	Actual Number of Patients
1	I10	Essential (primary) hypertension	2,549,204
2	K21	Gastro-oesophageal reflux disease	1,863,232
3	E78	Disorders of lipoprotein metabolism and other lipidaemias	1,862,552
4	K59	Other functional intestinal disorders	1,755,424
5	K29	Gastritis and duodenitis	1,385,787
6	E11	Type 2 diabetes mellitus	1,241,193
7	M54	Dorsalgia	1,165,265
8	I50	Heart failure	1,118,720
9	G47	Sleep disorders	1,079,016
10	H52	Disorders of refraction and accommodation	895,695

Health Insurance Data (December 2024-November 2025)
	ICD 10 Code	ICD 10 Category Name	Actual Number of Patients
1	J30	Vasomotor and allergic rhinitis	668,143
2	J06	Acute upper respiratory infections of multiple and unspecified sites	576,914
3	J20	Acute bronchitis	512,865
4	H52	Disorders of refraction and accommodation	445,880
5	H10	Conjunctivitis	369,011
6	J02	Acute pharyngitis	351,480
7	L30	Other dermatitis	334,969
8	J45	Asthma	307,247
9	K29	Gastritis and duodenitis	298,201
10	L85	Other epidermal thickening	267,495

Respiratory Diseases

DPC Data (January 2025-December 2025)
	ICD 10 Code	ICD 10 Category Name	Actual Number of Patients
1	I10	Essential (primary) hypertension	891,133
2	J30	Vasomotor and allergic rhinitis	827,865
3	K21	Gastro-oesophageal reflux disease	759,046
4	K59	Other functional intestinal disorders	687,113
5	E78	Disorders of lipoprotein metabolism and other lipidaemias	631,418
6	J45	Asthma	563,394
7	J06	Acute upper respiratory infections of multiple and unspecified sites	545,463
8	K29	Gastritis and duodenitis	479,694
9	G47	Sleep disorders	476,681
10	I50	Heart failure	465,593

Health Insurance Data (December 2024-November 2025)
	ICD 10 Code	ICD 10 Category Name	Actual Number of Patients
1	J30	Vasomotor and allergic rhinitis	668,143
2	J06	Acute upper respiratory infections of multiple and unspecified sites	576,914
3	J20	Acute bronchitis	512,865
4	J02	Acute pharyngitis	351,480
5	J45	Asthma	307,247
6	H10	Conjunctivitis	256,764
7	J10	Other influenza viruses isolated from influenza	192,801
8	J01	Acute sinusitis	192,162
9	L30	Other dermatitis	181,455
10	K29	Gastritis and duodenitis	173,520

Note: The above ranking is extracted from health insurance data. Data from the National Health Insurance and Medical Care System for the Elderly are not included.

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