effectiveDateRangeThe time period during which the phone number or communications address is valid for the person or organization. The data type is a TimeInterval, which includes both a start date and end date, either of which may be empty."Time period when the contact point was/is in use." - HL7 FHIR, ContactPoint.period.
isTextMessageEnabledIndicates whether the endpoint can receive text messages. Used for phone numbers only. Added for ONC S&I Clinical Element Data Dictionary (CEDD).
rankThis optional property is included for compatibility with FHIR. It allows for the ordering of contact points within a list or collection of contact points."Specifies a preferred order in which to use a set of contacts. Contacts are ranked with lower values coming before higher values." - HL7 FHIR, ContactPoint.rank
system"Telecommunications form for contact point - what communications system is required to make use of the contact." - HL7 FHIR, ContactPoint.system.
useIndicates the kind of communications address that is contained within this class. Examples include primaryHome, Work, etc. This facilitates the selection of a particular communications address from a list of contact points that may apply to the person or organization."Identifies the purpose for the contact point." - HL7 FHIR, ContactPoint.use.
valueRepresents a telecommunications address at which the person or organization may be reached. Note that this property is a simply a string, the formatting of which will depend on the type of communications address employed."The actual contact point details, in a form that is meaningful to the designated communication system (i.e. phone number or email address)." - HL7 FHIR, ContactPoint.value.