Maximum Defined Data Set All of the required data elements for a particular standard based on a specific implementation specification." [45 CFR 162.103] An entity creating a transaction is free to include whatever data any receiver might want or need. The recipient is free to ignore any portion of the data that is not needed to conduct their part of the associated business transaction, unless the inessential data is needed for coordination of benefits. Legislation Files Containing This Term: legislation/45CFR-162.103.html