Japan is already one of the world's oldest societies, with people aged 65 and older now comprising approximately 30% of the total population. Medical and long-term care needs are expected to rise continuously as the population ages further, placing intense pressure on the country's universal health insurance system. The roles required of healthcare providers are growing more complex — spanning emergency care, home-based care, and the ongoing management of chronic conditions.

Adding to the structural challenge, Japan's medical data ecosystem remains fragmented. Standardisation is still a work in progress, and personal health data is siloed across disparate services, limiting the ability to connect institutional medical records with individual health data. At the same time, growing reliance on AI infrastructure located outside Japan has raised serious concerns about data sovereignty and economic security — particularly around how sensitive health and medical data is handled.

It is against this backdrop that Fujitsu, SMBC Group, and SoftBank signed a basic business alliance agreement on 18 May 2026 — with IBM Japan also entering a separate but parallel collaboration — to address these systemic challenges through domestically built, AI-driven healthcare infrastructure.

At the heart of the alliance is a Japan-developed data platform housed entirely within domestic data centres. The platform will securely manage and utilise medical data held across healthcare information systems, then combine it with personal health data controlled directly by individuals — all linked and managed based on individual consent. This architecture directly addresses the data sovereignty concerns that have made Japan wary of offshore AI infrastructure.

Built on top of this data layer will be app-based AI agents designed to act as personalised health partners for each user. These agents will deliver tailored health recommendations, support ongoing care management, and improve access to medical services through a single unified digital platform. The supported journey is comprehensive — from daily wellness management and preventive care through to medical consultations, treatment, and post-treatment follow-up.

The initiative also aligns directly with Japan's national healthcare digital transformation agenda, targeting future integration with public infrastructure including the Nationwide Healthcare Information Platform and the My Number Portal — the country's digital identity system — creating a single expandable framework aligned with government health policy.

Running in parallel, Fujitsu and IBM Japan are jointly developing a dedicated sovereign cloud platform for healthcare institutions. This infrastructure is designed to support the operation of both companies' electronic health record (EHR) solutions, with high standards of data sovereignty, security, and operational continuity built in from the ground up.

The AI application layer within this collaboration targets direct operational relief for clinical staff. Fujitsu and IBM Japan plan to deploy AI tools for generating clinical documentation, preparing nursing reports, and automating DPC coding for medical fee claims — reducing administrative workloads so that healthcare professionals can focus more time on patient care and clinical decision-making.

Beyond hospital operations, both companies are exploring advanced pharmaceutical applications — including clinical trial optimisation and cross-institutional research collaboration. By securely connecting healthcare data with patient consent, the partnership aims to improve candidate identification for clinical trials and accelerate drug development, working with university hospitals and national medical centres.

The alliance has put a specific number on its ambition. By creating new businesses that streamline costs linked to duplicate testing, repeat prescriptions, disease aggravation from interrupted treatment, and preventable illness progression, the companies aim to help curb future healthcare cost increases on the scale of approximately 5 trillion yen — contributing to the long-term sustainability of Japan's universal health insurance model.

To achieve the scale needed, the three companies will leverage their respective customer touchpoints to grow the platform to 60 million users and secure adoption across 4,000 medical institutions. The alliance also aims to build a unified application environment where users can access diverse healthcare, government, payments, and wellness services through a single app — in collaboration with healthcare providers and local governments across Japan.

Key Takeaways

• →Fujitsu, SMBC Group, and SoftBank signed a landmark business alliance on 18 May 2026 to build a Japan-developed, sovereign AI healthcare platform — with IBM Japan joining a parallel collaboration on cloud EHR infrastructure.
• →With 30% of Japan's population aged 65 and over, the initiative directly targets the sustainability of the country's universal health insurance system amid accelerating demographic ageing.
• →App-based AI agents will act as personalised health partners — integrating medical institution data with individual health data, based on user consent — supporting the full patient journey from daily wellness to post-treatment follow-up.
• →All infrastructure will be hosted in domestic Japan-based data centres, directly addressing national data sovereignty concerns and aligning with Japan's economic security priorities for sensitive health data.
• →The alliance targets 60 million users and adoption by 4,000 medical institutions, with the goal of curbing future national healthcare cost increases by approximately 5 trillion yen.
• →The platform will integrate with Japan's Nationwide Healthcare Information Platform and My Number Portal — positioning it as a foundational piece of the country's national health digitisation strategy.