Reze Releases 'Billing Operations Workspace,' the First Step Toward Automating Medical Claims Processes

Mutex Inc. (headquartered in Hongo, Bunkyo-ku, Tokyo; Representative Director Kohei Kumazawa; hereinafter "mutex"), provider of Reze, an AI-powered medical claims support tool for healthcare institutions, has released the "Billing Operations Workspace," a centralized platform integrating all workflows related to medical billing operations.

This new feature consolidates previously offered pre-submission checks and symptom description generation into a single workspace. It serves as the core foundation for Reze's vision of achieving full automation of medical claims processes, enabling the phased rollout of next-generation AI functionalities currently under development—including AI for add-on suggestions, comment generation, and DPC coding.

Key Features of This Release

- Consolidation of all billing processes into one unified workspace. By integrating previously fragmented workflows such as pre-submission checks and symptom description generation, the workspace seamlessly connects tasks that medical billing staff typically handle at month-end and month-beginning.

- Future AI features—including Add-on Suggestion AI, Comment Generation AI, and DPC Coding AI—will be integrated into this workspace. Reze will use this platform as a launchpad to progressively deploy AI agents for claims processing, gradually expanding the scope of automation.

- The ultimate goal is full automation of medical billing operations via AI agents. Reze is now moving forward in earnest toward realizing a future where insurance claims are automatically completed the moment a physician enters a medical record—with the aim of achieving this by 2027.

Background: Healthcare Institutions Face Growing Financial Pressure Amid Increasingly Complex Reimbursement Systems

According to a survey by the Japan Hospital Association, 74.9% of hospitals report operating deficits. Amid repeated revisions to medical reimbursement schedules, optimizing DPC coding, preventing missed billing add-ons, ensuring accurate notes in claim summaries, and responding quickly to claim rejections and audits have become critical to healthcare institutions' financial sustainability.

Yet in most cases, these tasks are still handled manually by medical billing staff, who must navigate multiple systems. This leads to concentrated workloads at month-end and month-beginning, resulting in operational bottlenecks, missed billing opportunities, and delayed responses to claim rejections.

Since its official launch in July 2025, Reze has progressively released features such as Symptom Description AI, AI Claims Checker, and Rejection Classification AI—each designed to support medical billing staff with AI-powered assistance. The new "Billing Operations Workspace" marks a significant advancement from this support phase toward full-scale automation of claims operations using AI.

About the Billing Operations Workspace

The Billing Operations Workspace is a core function within Reze, designed to streamline the entire medical claims process within a single interface.

- Rejection Management Workspace: Handle and track claims returned by insurers

- Audit Management Workspace: Respond to and analyze claims with audit-related reductions

- Billing Operations Workspace: Conduct pre-submission checks, generate symptom descriptions, and manage check rules

The workspace enables centralized management of task assignments, progress tracking, detailed information review, and CSV/XLSX exports.

Why This Workspace Is Being Introduced Now

Reze's previously released AI features—including Symptom Description Generation AI, AI Claims Checker, and Rejection Classification AI—were designed as standalone tools to assist with individual tasks.

However, Reze's ultimate goal is not merely to improve efficiency in isolated tasks. The vision is to achieve a state in which, the moment a physician completes a medical record, the insurance claim is already finalized.

To realize this, AI functions must not operate in isolation. Instead, all steps in the billing process must be connected within a single workflow, with multiple AI components working in concert. The Billing Operations Workspace is the release that creates this unified environment.

From this foundation, Reze will progressively integrate the following AI functionalities into the workspace:

- Symptom Description Generation AI (already released): Automatically generates clinical details from electronic medical records

- AI Claims Check (already released): Automatically detects billing errors and missing diagnoses

- Rejection Classification AI (already released): AI automatically categorizes and prioritizes claim rejection reasons

- Add-on Suggestion AI (in development): AI automatically detects and suggests missed or overbilled add-ons

- Comment Generation AI (in development): AI automatically generates and suggests summary comments

- DPC Coding AI (in development): Supports selection and optimization of Diagnosis Procedure Combination codes

- Rejection Response AI (in development): AI analyzes rejection reasons and suggests resubmission content

Future Roadmap

- By 2026: Roll out Add-on Suggestion AI, Comment Generation AI, and DPC Coding AI sequentially, integrating them into the Billing Operations Workspace to establish an interconnected AI-driven workflow

- 2026–2027: Concurrently advance PoC projects for integration with electronic medical record (EMR) systems, building systems that automatically complete claims upon reading clinical notes

- By 2027: Achieve full automation of medical claims operations through AI agents

About Reze

Reze is an AI-powered medical claims management SaaS provided by mutex Inc. Through features such as rejection and audit response management, AI-powered symptom description generation, and AI claims checks, Reze supports healthcare institutions in improving claims efficiency and optimizing revenue. Reze delivers three core values: increased revenue, improved workstyles, and better management—with the long-term goal of achieving full automation of medical claims operations through AI agents.

[Company Overview]

Company Name: mutex Inc.

URL: https://www.mutex-inc.dev

Headquarters: 8F, Design Place α, 4-1-4 Hongo, Bunkyo-ku, Tokyo

Representative: President and Representative Director Kohei Kumazawa

Date Founded: February 10, 2022

Capital: 60.01 million JPY (including capital reserves)

Business Activities: Planning, research, development, design, manufacturing, sales, maintenance, leasing, rental, import/export, and consulting services related to computer software and hardware

[Inquiries]

E-Mail: contact@reze.app

TEL: 090-7388-4632

Corporate Site: https://www.mutex-inc.dev

Reze Official Website: https://lp.reze.app/

Service Details and Inquiries: https://lp.reze.app/request-information

Company names and service names mentioned in this press release are trademarks or registered trademarks of their respective companies.

The information contained in this press release—including company names, products, specifications, contact details, and other information—is accurate as of the date of announcement and is subject to change without notice.