Redox, a Madison, WI-based startup that develops digital tools that enable healthcare applications to access data from electronic health records systems, says it has raised $9 million from investors.

New York-based RRE Ventures led the Series B financing. Other participants in the funding round included return backers .406 Ventures (in Boston), HealthX Ventures (Madison), and Flybridge Capital Partners, which has offices in Boston and New York. .406 Ventures led Redox’s $3.5 million Series A round, which was announced in late 2015.