This page is part of the FHIR Specification (v3.0.2: STU 3). The current version which supercedes this version is 5.0.0.  For a full list of available versions, see the Directory of published versions  . Page versions: R4 R3
. Page versions: R4 R3
| Vocabulary  Work Group | Maturity Level: 0 | Informative | Use Context: Not Intended for Production use | 
This is a code system defined by the FHIR project.
Summary
| Defining URL: | http://hl7.org/fhir/ex-onsettype | 
| Name: | Example Onset Type (Reason) Codes | 
| Definition: | This value set includes example Onset Type codes which are used to identify the event for which the onset, starting date, is required. | 
| Committee: | Financial Management  Work Group | 
| OID: | 2.16.840.1.113883.4.642.1.571 (for OID based terminology systems) | 
| Copyright: | This is an example set. | 
| Source Resource | XML / JSON | 
This Code system is used in the following value sets:
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. | 
See the full registry of value sets defined as part of FHIR.
Explanation of the columns that may appear on this page:
| Level | A few code lists that FHIR defines are hierarchical - each code is assigned a level. In this scheme, some codes are under other codes, and imply that the code they are under also applies | 
| Source | The source of the definition of the code (when the value set draws in codes defined elsewhere) | 
| Code | The code (used as the code in the resource instance). If the code is in italics, this indicates that the code is not selectable ('Abstract') | 
| Display | The display (used in the display element of a Coding). If there is no display, implementers should not simply display the code, but map the concept into their application | 
| Definition | An explanation of the meaning of the concept | 
| Comments | Additional notes about how to use the code |