MIIS (Meditech Interpretive Information System) is a MUMPS-like programming language that was created by A.Neil Pappalardo and Curt W. Marble, on a DEC PDP at Mass General Hospital from 1964 to 1968.
For example, when encountering an undefined variable, MUMPS generates an error where MIIS treats it as nil.
In the 1980s Brigham and Women's Hospital in Massachusetts used MIIS to program their Data General Mainframe.
In 1986, SCAMC reported that Vancouver General Hospital also had an Integrated Cardiology Patient Management System written in MIIS.
It has also been used to create financial systems for insurance brokers, as seen in Ireland and the UK in the late 1970s.