The diploma will teach the importance of unifying and coordinating a company's promotional efforts to deliver a consistent message, with all customer contact points seen as equally significant.
The IDM claims that more than 70% of the course material is completely new and will not be found on the syllabus of any other marketing qualification in the UK.
It is calling the course 'IMC' after the term coined by Professor Don Schultz, the professor of integrated marketing communications at Northwestern University in Chicago.
Schulz said: "Every marketer, every agency now faces the 'integration challenge'. They must learn a new approach.
"The customer can now seek out a myriad of products, services and suppliers via a multitude of communication channels. As a result, every marketer, every agency now faces the 'integration challenge'."
The IDM has created the IMC council of management to guide the course content, and has recruited 20 marketers to form the body.
Derek Holder, IDM managing director, said: "Media fragmentation, global connectivity, and the shift in power from business to consumer make learning about IMC vital for businesses.
"Old style mass marketing has given way to targeted, one-to-one communications, and marketers must balance 'push' and 'pull' to create marketing messages that consumers accept or even actively welcome."