Thoughts and Opinions
HL7 201 - The Admission, Discharge, Transfer (ADT) Message
The ADT message is one of the most common messages in HL7. It covers a lot of use cases such as admissions, cancellation of admits, merging of patient data, etc. This is the reason why there is such a long list of possible events and message types that could be sent.
HL7 102 - Anatomy of an HL7 message
Think of an HL7 message as an envelope. It contains various segments (pieces of data) which are (usually) patient oriented and triggered based on specific events (admits, lab results, procedures, discharge etc.) and communicate relevant information about that triggered event.
HL7 101 - A primer
Health Level Seven (HL7) is a standard utilized by the healthcare industry to enable messaging between applications, EHR to PMS (practice management system) for example. It is managed and maintained by Health Level Seven International (HL7) which is a not-for-profit, ANSI-accredited standards developing organization.