# text.div
This code system http://hl7.org/fhir/evidence-variable-event defines the following codes:

Code | Display | Definition
study-start | Study Start | The time of enrollment for the study participant
treatment-start | Start of Treatment | The time of initiation of the treatment
condition-detection | Detection of Condition | The time of first detection of the condition
condition-treatment | Treatment of Condition | The time of first treatment of the condition
hospital-admission | Hospital Admission | The time of admission to the hospital
hospital-discharge | Hospital Discharge | The time of discharge from the hospital
operative-procedure | Operative Procedure | The time of surgery

# description
The event used as a base point (reference point) in time.

# concept[].definition
The time of enrollment for the study participant

# concept[].definition
The time of first detection of the condition

# concept[].definition
The time of first treatment of the condition