Hi Chris, the current version of concordance statistics for proc phreg only works for events with no "rival" way of exiting the riskset, e.g. 1 for death and 0 for censored(alive). When there are 2 or more competing events and they are not mutually exclusive (alive, sick, dead), then the current version of concordance statistics is not valid: https://ifsv.sund.ku.dk/biostat/annualreport/images/f/f4/Research_Report_16-04.pdf
@greveam Many thanks for your question and suggestion. I am the developer at SAS who implemented the CONCORDANCE option in PHREG. Looking forward, we are definitely considering adding new features for evaluating competing risks models such as the Fine and Gray.