I managed to get into three of them.
The area itself has been "re-populated" in parts. Some of the buildings have been renovated, some have been torn down and new ones have been built.
Four of the big hospital buildings are still abandoned and pretty easy to access.
The complex was built around 1900 and during WWII was used as a military hospital for the navy in Kiel. After the war, the buildings were used by the university, whose buildings had been partially destroyed during the war. For example, the Department of Neurosurgery was relocated into the old hospital.
In 1988, the hospital was closed down.