This page is part of the HL7 FHIR Implementation Guide for Military Service History and Status (v1.0.0: STU1) based on FHIR R4. This is the current published version. For a full list of available versions, see the Directory of published versions 
| The US Veteran profile specifies an additional extension to the set already supported by the FHIR US Core profile it extends. This extension is a boolean flag used to specify/store the confirmation/verification status. true: the Patient record describes a Veteran or false: the Patient is either not a verified yet or under review if the flag is absent, then the veteran status is undetermined. |
Using patient match patientmatch verify existence of extension USVeteranStatus to evaluate veteran status. A return missing extension completely is a result of undetermined.