COEKG:Characteristics of A Perfect Identifier
From US Dept of Health and Human Services
The 30 criteria are:
Accessible (available when required).
Assignable (assign when needed by trusted authority after properly authenticated request).
Atomic (single data item--no subelements having meaning).
Concise (as short as possible).
Content-free (no dependence on possibly changing or unknown information).
Controllable (only trusted authorities have access to linkages between encrypted and non-encrypted identifiers).
Cost-effective (maximum functionality with minimum investment to create and maintain).
Deployable (implementable using a variety of technologies).
Disidentifiable (possible to create a number of encrypted identifiers with same properties).
Focused (created and maintained solely for supporting health care--form, usage, and policies not influenced by other activities).
Governed (has entity responsible for overseeing system--determines policies, manages trusted authorities, and ensures proper and effective support for health care).
Identifiable (possible to identify the person with such properties as name, birth date, sex, etc, by associating these with the identifier).
Incremental (capable of being phased in).
Linkable (can link health records together in both automated and manual systems).
Longevity (designed to function for foreseeable future with no known limitations).
Mappable (able to create bidirectional linkages between new and existing identifiers during incremental implementation of a new identifier).
Mergeable (can merge duplicate identifiers to apply to the same individual).
Networked (supported by a network that makes services available universally).
Permanent (never to be reassigned, even after a holder’s death).
Public (meant to be an open data item--person can reveal it).
Repository-based (secure, permanent repository exists to support functions).
Retroactive (can assign identifiers to all existing individuals when system is implemented).
Secure (can encrypt and decrypt securely).
Splittable (able to assign new identifier to one or both people if the same identifier is assigned to two people).
Standard (compatible if possible with existing or emerging standards).
Unambiguous (minimizes risk of misinterpretation such as confusing number zero with letter O).
Unique (identifies one and only one individual).
Universal (able to support every living person for the foreseeable future).
Usable (processable by both manual and automated means).
Verifiable (can determine validity without additional information).