The EMR Information Sharing Service is one of the harder Medical DX measures to grasp. The description "three documents and six information categories are shared" is widely known, but there are few occasions to see why this mechanism was needed and how it connects to other measures. This article explains its policy positioning and design philosophy rather than the steps for practical compliance. For adoption steps and addition requirements, see the complete guide to the EMR Information Sharing Service.
Disclaimer: This article is general information. The start of operation, sharing scope, and treatment under the fee schedule may change. In practice, always confirm the latest primary sources (official MHLW materials and others).
For the overall map of Medical DX, see What Is Medical DX? The Government Roadmap and Its Three Pillars.
The National Medical Information Platform Concept
Pillar ① of Medical DX is "building the National Medical Information Platform." This does not denote a single giant system; it is a collective term for several purpose-built information-sharing mechanisms.
| Information shared | Mechanism |
|---|---|
| Eligibility (insurance status) | Online eligibility verification |
| Medication information (prescribing/dispensing) | Electronic prescriptions |
| Clinical information (diagnoses, tests, etc.) | EMR Information Sharing Service |
| Information held by municipalities (vaccinations, checkups, etc.) | PMH |
| Long-term care information | Long-term care information infrastructure |
Laid out this way, the service's role becomes clear. Mechanisms for eligibility and medication information were established first, leaving only clinical information—the substance of the chart—as a blank. The EMR Information Sharing Service fills that gap.
Why It Was Narrowed to "Three Documents, Six Categories"
EMRs accumulate vast amounts of information. That sharing is limited to three documents and six categories reflects a design judgment more than a technical constraint.
- Start with what can be standardized: free-text chart narrative is written differently at every site and is hard to use even if shared. Begin with information that is easy to structure—diagnoses, allergies, contraindicated drugs, infectious diseases, tests, and prescriptions
- Prioritize clinically valuable information: it selects what you most want to know in situations where "you don't know anything about this patient"—first visits, emergency transport, disasters
- Contain the burden on institutions: the wider the sharing scope, the greater the input and verification workload
In short, the three documents and six categories are not the end state but a starting point. The scope is expected to widen in stages as standardization advances.
What Adopting HL7 FHIR Means
The standard adopted for sharing is HL7 FHIR, and this reflects lessons from the past.
Regional medical cooperation networks have long been built around the country, but specifications and operations differed by region, so linkage broke down across regional boundaries. Building the ability to connect anywhere in the country under the same specification into the design from the start is the essential difference this time.
FHIR is an international standard, and the choice also looks ahead to future linkage with other systems and to secondary use of medical information for research and policymaking.
From Model Projects to Full Operation
| Period | Content |
|---|---|
| 2023 | Design and development begin |
| 2024 | Operational testing at medical institutions |
| January 2025 | Model projects launched in nine regions nationwide |
| FY2025–FY2026 | Toward full operation, after verification and modification through model projects |
Full operation was initially expected during FY2025, but modifications were made based on model-project findings, and the timing has slipped from the original assumption. With large-scale information-sharing infrastructure, it is not unusual for schedules to be adjusted after field verification. When planning adoption, check the latest published schedule.
Relationship to Other Measures
With Electronic Prescriptions
Electronic prescriptions handle prescribing and dispensing information. "Prescriptions" also appears among the six categories, but the immediacy and purpose differ. Electronic prescriptions exist to check duplicate prescribing and contraindicated combinations on the spot at the point of dispensing; the sharing service exists to grasp a patient's background in the clinical context. They are complementary, not competing.
With the Standard EMR
To share information, data must exist electronically at the institution and conform to standards. The standard EMR is a measure to increase the number of institutions meeting that precondition. If the sharing service is the "plumbing," the standard EMR is the effort to "add more taps."
With the Fee Schedule
Additions such as the electronic clinical information coordination fee build support for the service into facility standards. Policy steering operates through both subsidies and the fee schedule.
What Clinics Should Consider Now
1. Confirm Your Vendor's Approach
Ask your vendor whether your EMR will support the service, and if so, when and at what cost. Standards support is becoming a basic criterion in system selection.
2. Input Quality Comes Under Scrutiny
Shared information derives directly from what is entered into your own EMR. How diagnoses are coded and whether allergies and contraindications are registered—the quality of your in-house data entry becomes visible to other institutions. It is worth tidying masters and revisiting input rules before sharing begins.
3. Design the Consent Workflow
Clinical information is special care-required personal information, and sharing presupposes patient consent. You need to design the explanation procedure at reception and the method of obtaining consent as an operational workflow in advance.
With AI Karte
The AI-native EMR "AI Karte" is designed on the premise of standards support, and our policy is to support the Medical DX information-sharing mechanisms. In addition, because diagnoses and prescriptions are structured at the stage of chart generation via voice input, it is easier to maintain the quality of the data that will be shared. We are happy to discuss this individually at adoption, including how to satisfy addition requirements.
Conclusion
The EMR Information Sharing Service fills the last blank—clinical information—within the National Medical Information Platform. It starts from the limited scope of three documents and six categories, but that is a starting point that will widen as standardization advances. Practically, clinics should settle three things before full operation: confirming the vendor's approach, revisiting in-house data entry quality, and designing the patient consent workflow.
Through providing AI Karte, Pottech aims to be the ideal business partner for clinics—improving the working environment for physicians, nurses, and medical clerical staff, and supporting clinics in fully realizing what they want to achieve.
For more details, please feel free to contact us.