Well, at least this is what people who do not know Debian right might think about it. But in fact Debian is a different kind of distribution ...
The Debian Project is an association of individuals who have made common cause to create a free operating system. This operating system that we have created is called Debian GNU/Linux, or simply Debian for short.
Moreover, work is in progress to provide Debian for other kernels, including in particular the Hurd, NetBSD and FreeBSD. There have even been discussions of a possible port to Windows.
These individuals, called Debian developers, are connected via the web of trust built by cross-signing GPG keys.
Debian-Med is a Custom Debian Distribution. These projects try to cover the needs of special groups of users. For the Debian-Med project these users are medical care professionals.
It is important to understand that Debian-Med is completely integrated into Debian. It is not a separate distribution. If you get the Debian GNU/Linux distribution you have all of Debian-Med.
Debian-Med takes care of program packages in the field of medicine which are already integrated in Debian. This means to check whether they integrate perfectly into the menu system and for availability of essential documentation and perhaps of translations of very important parts.
Debian-Med also builds packages of medical software which is missing inside Debian and integrates of those packages to work well with all other software in Debian.
Medical users have to concentrate on their work. The computer should help them do this work without attracting attention. That's why menus flooded with stuff they do not use, configuration stuff which the distributor could do, etc. should not bother them in everyday life. In this sense Debian-Med wants to maintain a general infrastructure for medical users.