One thing about these codes that make me laugh is that they are TRULY specific to one COMPANY, when the Federal Government is pushing for the elimination of codes nationwide to aid in interoperability. So much for public/private cooperation. These EMD protocols are supposed to be setting a national standard, but they don't pay any attention or give any respect to the direction that radio traffic should be going, in fact, it's just the opposite.
Before people try to defend it to me, I am a EMT-B, EMT-B Instructor/Coordinator, EMT-B State Examiner, EMD certified, over 13 years of EMS dispatch and field experience in an urban 9-1-1 system (with 3 years PD dispatch, 3 years private EMS and 10 years volunteer firefighting experience as well), and give regular lectures on EMS communications at the college level. I am intimately familiar with the EMD programs out there, and, quite honestly, none of them can come close to a trained and well experienced EMT or Paramedic applying their knowledge and experience in processing a 9-1-1 call for medical assistance.