In order to successfully process online services you use such as Eclipse, DVA and AIR, Medicare needs to identify your practice. It does this using a unique identifier known as a Minor ID.
Traditionally, a Minor ID was only required by practices running MedicalDirector Helix, Pracsoft, or Bluechip, as these applications include functionality for generating/receiving online claims and other such Medicare services. However, with the addition of AIR Web Services to MedicalDirector Clinical 4.2, a Minor ID is now also required by all sites running Clinical 4.2 or later.