Zip Codes management across all CDMs

[DaveraGabriel]

Zip Code is not a required field in all CDMs. What remedy should be implemented when the Zip code is absent?
1) substitute the zip of the health system / data partner?
2) leave the field blank / null?
3) Ask the sites to produce zip code fields?

[hlehmann17]

Since zip code will be presumed by the analysts to "belong" to the individual, I think we do a disservice by imputing anything. And providing a site zip code only increases the likelihood of institution reidentification.

[DaveraGabriel]

related to issue #48, closed for consolidation to this one: "Per mapping validation review - the TriNetX data will likely always have 5 digit zip codes - will require consistent reduction to leading 3 digits"