A map containing additional external identifiers. If the patient is created or mapped in Metriport through one of
our EHR apps - this property will be populated with the ID from the EHR, and included
within the webhook payloads.
The Patient's gender at birth, can be one of M or F or O or U. Use O (other) when the patient's gender is known but it is not M or F, i.e intersex or hermaphroditic.
Use U (unknown) when the patient's gender is not known.