Why does the RSR require clinical data elements only for clients who have received OAHS?

Outpatient ambulatory health services (OAHS) has the greatest client-level data reporting burden, including clinical data, because there is an expectation that providers have access to these data for their OAHS clients.

The table of required client-level data elements for RWHAP services (on page 59 of the RSR Instruction Manual) include a column on the far right that lists the rationale for collecting each data element.