Colorado has decided to use the last Provider-Person Interaction/Visit as the date of death. Sounds simple, but with Epic data, identifying the actual Provider-Person interactions from the “paperwork/run a hospital/allow an EHR to function” encounters isn’t easy. Using the last Provider-Person Interaction/Visit is the last time we know they were alive. Not perfect. And we are definitely open to other options: death flag, improved heuristic, etc. Fortunately, we have state death registry data, so we don’t have a large percentage of death records using the above logic.