Mutex Raises ¥281.6M Series A

Mutex, a Tokyo-based health-tech startup specializing in medical claims processing automation, has raised 281.6 million yen in a Series A funding round. This latest investment brings the company's total funding to 341.6 million yen.

Investors

The funding round included participation from MTI Co., Ltd., MEDIPAL Innovation Investment Limited Partnership (a CVC fund of Medipal Holdings Co., Ltd.), and Nippon Management Co., Ltd.

Mutex Use of Funds

The newly raised capital will be utilized to expand the number of medical institutions adopting the company's AI-powered medical billing SaaS, Reze, on a paid basis. Additionally, funds will be directed toward accelerating product development aimed at the complete automation of medical claims processing workflows.

About Mutex

Founded in 2022 by Representative Director Kohei Kumazawa, Mutex provides AI-driven software solutions for the healthcare sector. Its flagship product, Reze, is an AI-powered SaaS designed to automate medical billing operations, helping healthcare facilities reduce administrative burdens, prevent billing errors, and improve operational efficiency.

Funding Details

Company Website: https://mutex-inc.dev

Company: Mutex Co., Ltd.
Raised: ¥281.6M
Round: Series A
Funding Date: September 30, 2026
Additional Investors: MTI Co., Ltd., MEDIPAL Innovation Investment Limited Partnership, Nippon Management Co., Ltd.
Company Website: https://www.mutex-inc.dev
Software Category: HealthTech
Source: https://prtimes.jp/main/html/rd/p/000000021.000133022.html