Patient identifiers: stumbling blocks or cornerstones for CPRs (computer-based patient records)?

As the computer-based patient record, or CPR, moves closer to reality, patient identification issues remain unresolved. A mechanism already in place would be the Social Security number, or SSN. But legal questions surround its use for specific identification purposes. And not everyone has one. Healthcare Informatics asked several people closely involved with computerizing patient records about alternatives to social security numbers. Their responses may prove enlightening.