| Lvl | Code | Display | Definition | Not Selectable | 
| 1 | 
group  | 
Group | 
An item with no direct answer but should have at least one child item. | 
 | 
| 1 | 
display  | 
Display | 
Text for display that will not capture an answer or have child items. | 
 | 
| 1 | 
question  | 
Question | 
An item that defines a specific answer to be captured, and which may have child items. (the answer provided in the QuestionnaireResponse should be of the defined datatype). | 
true | 
| 2 | 
  boolean  | 
Boolean | 
Question with a yes/no answer (valueBoolean). | 
 | 
| 2 | 
  decimal  | 
Decimal | 
Question with is a real number answer (valueDecimal).  There is an extension 'http://hl7.org/fhir/StructureDefinition/questionnaire-unit' that can be used to computably convey the unit of measure associated with the answer for use when performing data extraction to an element of type Quantity. | 
 | 
| 2 | 
  integer  | 
Integer | 
Question with an integer answer (valueInteger).  There is an extension 'http://hl7.org/fhir/StructureDefinition/questionnaire-unit' that can be used to computably convey the unit of measure associated with the answer for use when performing data extraction to an element of type Quantity. | 
 | 
| 2 | 
  date  | 
Date | 
Question with a date answer (valueDate). | 
 | 
| 2 | 
  dateTime  | 
Date Time | 
Question with a date and time answer (valueDateTime). | 
 | 
| 2 | 
  time  | 
Time | 
Question with a time (hour:minute:second) answer independent of date. (valueTime). | 
 | 
| 2 | 
  string  | 
String | 
Question with a short (few words to short sentence) free-text entry answer (valueString).  Strings SHOULD NOT contain carriage return or newline characters.  If multi-line answers are needed, use the 'text' type. | 
 | 
| 2 | 
  text  | 
Text | 
Question with a long (potentially multi-paragraph) free-text entry answer (valueString). | 
 | 
| 2 | 
  url  | 
Url | 
Question with a URL (website, FTP site, etc.) answer (valueUri). | 
 | 
| 2 | 
  coding  | 
Coding | 
Question with a Coding - generally drawn from a list of possible answers (valueCoding) | 
 | 
| 2 | 
  attachment  | 
Attachment | 
Question with binary content such as an image, PDF, etc. as an answer (valueAttachment). | 
 | 
| 2 | 
  reference  | 
Reference | 
Question with a reference to another resource (practitioner, organization, etc.) as an answer (valueReference). | 
 | 
| 2 | 
  quantity  | 
Quantity | 
Question with a combination of a numeric value and unit as an answer. (valueSimpleQuantity)  There are two extensions ('http://hl7.org/fhir/StructureDefinition/questionnaire-unitOption' and 'http://hl7.org/fhir/StructureDefinition/questionnaire-unitValueSet')  that can be used to define what unit should be selected for the Quantity.code and Quantity.system. | 
 |