## Extensions

Below are the extensions used in the spec:

| Name | FHIR Extensions| Description|
|- 
|ContactPoint-Extension | http://hl7.org/fhir/StructureDefinition/contactpoint-extension | The number that may be dialed within a private phone network or after successfully connecting to a private phone network. This extension is used when a system wishes to designate specific parts of a phone number (and potentially place constraints on which components must be present and how they're filled in).|
|Health Card Version Code |http://ehealthontario.ca/fhir/StructureDefinition/ext-id-health-card-version-code |An assigned sequence code, uniquely identifying a Health Card issued (or potentially issued) to a Registered Person|
| LaunchString | http://help.caredove.com/developer-integrations/fhir-extension-launchstring |A link that brings the user to either the first step of a booking process, or a Caredove listings webpage, which has the users information pre-filled while going through Caredove's booking process for a referral.|