QTY at Loop 2100 is a situational segment, with a note 'Required when the value of a specific quantity identified by the QTY01 qualifier is non-zero. If not required by this implementation guide, do not send.' Is the QTY information REQUIRED to be sent back if it is submitted on the 837, similar to a line item control number, or is it returned if the information was stored in the payers system?
The QTY rules state this is to be sent if any quantities qualified are non zero. It does not reference if the QTY came in on the claim. If the QTY is greater than Zero in the payers system then it must be sent in the QTY segment with the appropriate qualifier.