This value set includes example Onset Type codes which are used to identify the event for which the onset, starting date, is required.
Copyright Statement: This is an example set.
This code system http://hl7.org/fhir/ex-onsettype defines the following codes:
| Code | Display | Definition |
| lxm | Last Exam | Date of last examination. |
| sym | Start of Symptoms | Date when symptoms were first noticed.. |
| lmn | Last Menstruation | Start date of last menstruation. |