In context of your question, we intepret that you mean for admissions for inpatient encounters. We expect that it would be up to your business rules to decide if "arrived" or "inprogress" was to be considered the start of the admission, and also have the presence of the hospitalization sub-component filled in. The "onleave" status may or may not be a part of the admission, for example if the patient was permitted to go home for a weekend or some other form of external event. The location is also likely to be filled in with a location status of "present". For other examples such as an outpatient visit (Day Procedure - colonoscopy), the patient could also be considered to be admitted, hence the encounter doesn't have a fixed defiinition of admitted. At a minimum, we do believe that a patient IS admitted when the status is in-progress. *Change to specification: *We will add additional guidance in section 5.19.1.1 Status Management to explain this better.