http://hl7.org/fhir/StructureDefinition/patient-mothersMaidenName|5.2.0

Mother's maiden (unmarried) name, commonly collected to help verify patient identity.
NameFlagsCardTypeDescription & Constraints
Extension
0..1Mother's Maiden name
 
extension
?..0
 
url
?..?
 
value[x] *
1..?
 
 
valueString *
1..?string