Hi we are trying to implement HL7v2 to FHIR translation for ADT messages
While mapping implementation we observed some of the coding terminology systems are not matching exactly V2 mssages.
For example V2 PV1.2 Patient Class maps to FHIR Encounter
https://www.hl7.org/fhir/encounter-definitions.html#Encounter.class
HL7 v2 PV1.2 Patient Class
|E|Emergency| -
|I|Inpatient|
|O|Outpatient|
|P|Preadmit|
|R|Recurring patient|
|B|Obstetrics|
|C|Commercial Account|
|N|Not Applicable|
|U|Unknown|
Not able to map above V2 PV1.2 Patient Class (Table #004) to FHIR Encounter Class V3 or V4 coding system https://www.hl7.org/fhir/v3/ActEncounterCode/vs.html
Does it mandatory or strictly to use latest coding system terminology ?
If im not able to map exact mappings can i use V2 system terminology as per FHIR link https://www.hl7.org/fhir/terminologies.html#extensible 4.1.5.2 Extensible If there is no applicable concept in value set (based on human review), an alternate concept (either system / code pair, or text ) may be used instead.
So in Encounter if i implement will this is acceptable ?
http://terminology.hl7.org/CodeSystem/v2-0004 i.e. 4.3.15.4.1 Code System Content referred here https://www.hl7.org/fhir/v2/0004/index.html
I did Mapping legacy/source system http://terminology.hl7.org/CodeSystem/v2-0004 codes to FHIR
Sample FHIR Encounter
{
“comments”: “FHIR Record : Encounter”,
“resource”: {
“resourceType”: “Encounter”,
“id”: “8e3ca7ad-a599-4936-8ef4-9d9ea88dee04”,
“class”: {
“system”: “http://terminology.hl7.org/CodeSystem/v2-0004”,
“code”: “I”,
“display”: “Inpatient”
},
“subject”: {
“reference”: “Patient/8e3ca7ad-a599-4936-8ef4-9d9ea88dee02”
},
“location”: {
“reference”: “Location/8e3ca7ad-a599-4936-8ef4-9d9ea88dee05”,
“status”: “active”
},
}
},