There are various ways in which complaints about healthcare providers’ performance can be handled in the Netherlands. In practice, situations occur relatively frequently in which one and the same treatment by a provider results in various different complaints procedures being instigated or, in other words, in concurrence between complaints procedures. Dutch periodicals published information on a total of 42 cases of concurrence between 1997 and 2007. Concurrence between complaints procedures prompts a series of questions about how it arises, its legal implications, the possible consequences for those involved and whether it has any added value. This article examines these various issues.