Developers interested in producing and marketing authorized NordDRG grouper software must apply for a "Certificate of Acceptance". Without this certificate the software may not be marketed as NordDRG compliant.
In summary, the certification process requires that the developer checks their grouper software using predefined test data to create a report of the grouping results. These are to be compared with the correct DRG grouping. The developer returns the test material together with a signed report, stating the correctness and validity of the grouping results. In addition, the developer should be prepared to send working versions of the batch and/or interactive grouper software for additional testing to NordDRG administration.