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Raw HL7 Message Input

Segment Breakdown

Click on any row, field, or component below to view detailed medical standard explanations.

Field & Component Explorer

Select any segment or field on the left to reveal its clinical definition.

HL7 Dictionary Reference

Raw FHIR JSON Input

Segment Breakdown

Expand the JSON tree nodes below. Click on any property node to view its path and clinical definition.

FHIR Property Explorer

Select a node in the FHIR tree breakdown to view its standard data schema details.

FHIR Schema Reference

HL7 ⇄ FHIR Data Converter

Bilingual automated mapping between HL7 v2 pipe-delimited standards and modern FHIR JSON schemas.

Source Message (Input)

Converted Output

HL7 & FHIR Reference Guide

Learn the core differences between legacy HL7 v2 messages and modern FHIR resource paradigms.

Common HL7 v2 Message Types

ADT (Admit, Discharge, Transfer)

View Code Example

MSH|^~\&|EPIC|HOSP|||2026||ADT^A01|MSG01|P|2.3
EVN|A01|20260813
PID|1||987654321^^^MRN||SMITH^JANE||19850524|F

ORU (Observation Result - Unsolicited)

View Code Example

MSH|^~\&|LIS|LAB|||2026||ORU^R01|MSG02|P|2.3
PID|1||12345^^^MRN||SMITH^JOHN
OBR|1|P1||85025^HEMOGLOBIN^LN
OBX|1|NM|718-7^HEMOGLOBIN^LN||14.2|g/dL|13.5-17.5|N

ORM (Order Message)

View Code Example

MSH|^~\&|CPOE|HOSP|||2026||ORM^O01|MSG03|P|2.3
PID|1||987654321^^^MRN||SMITH^JANE
ORC|NW|ORD551|||||1^once
OBR|1|ORD551||85025^HEMOGLOBIN^LN

MDM (Medical Document Management)

View Code Example

MSH|^~\&|EHR|HOSP|||2026||MDM^T02|MSG04|P|2.3
PID|1||987654321
TXA|1|CN|TX|20260813|||||||||DOC123
OBX|1|ED|||PDF_DATA^Base64^^^JVBERi0xLjQK...

SIU (Scheduling Information - Unsolicited)

View Code Example

MSH|^~\&|SCHED|HOSP|||2026||SIU^S12|MSG05|P|2.3
SCH|APT992||||||85^CONSULT|||60^MIN|||202608150900
RGS|1|A
AIL|1|A|CLINIC_A

VXU (Vaccination Record - Unsolicited)

View Code Example

MSH|^~\&|LIS|LAB|||2026||VXU^V04|MSG06|P|2.3
PID|1||987654321||SMITH^JANE
RXA|0|1|20260813|20260813|110^INFLUENZA^CVX|0.5|mL

DFT (Detailed Financial Transaction)

View Code Example

MSH|^~\&|BILLING|HOSP|||2026||DFT^P03|MSG07|P|2.3
PID|1||987654321||SMITH^JANE
FT1|1|||20260813|20260813|CG|99213^OUTPATIENT VISIT||1|120.00

Core FHIR Resource Types

Patient Resource

View Code Example

{
  "resourceType": "Patient",
  "id": "pat-1",
  "name": [{"family": "SMITH", "given": ["JANE"]}],
  "gender": "female",
  "birthDate": "1985-05-24"
}

Observation Resource

View Code Example

{
  "resourceType": "Observation",
  "status": "final",
  "code": {"coding": [{"system": "http://loinc.org", "code": "718-7", "display": "Hemoglobin"}]},
  "valueQuantity": {"value": 14.2, "unit": "g/dL"}
}

Encounter Resource

View Code Example

{
  "resourceType": "Encounter",
  "status": "finished",
  "class": {"system": "http://terminology.hl7.org/CodeSystem/v3-ActCode", "code": "AMB"}
}

Practitioner / Organization

View Code Example

{
  "resourceType": "Practitioner",
  "id": "dr-welby",
  "name": [{"family": "WELBY", "given": ["MARCUS"]}]
}

AllergyIntolerance Resource

View Code Example

{
  "resourceType": "AllergyIntolerance",
  "clinicalStatus": {"coding": [{"system": "http://terminology.hl7.org/CodeSystem/allergyintolerance-clinical", "code": "active"}]},
  "code": {"text": "Penicillin"}
}

Condition Resource

View Code Example

{
  "resourceType": "Condition",
  "clinicalStatus": {"coding": [{"system": "http://terminology.hl7.org/CodeSystem/condition-clinical", "code": "active"}]},
  "code": {"text": "Asthma"}
}

MedicationRequest Resource

View Code Example

{
  "resourceType": "MedicationRequest",
  "status": "active",
  "intent": "order",
  "medicationCodeableConcept": {"text": "Aspirin 81mg"}
}

Procedure Resource

View Code Example

{
  "resourceType": "Procedure",
  "status": "completed",
  "code": {"text": "Laparoscopic Appendectomy"}
}

Semantic Mappings (HL7 v2 Segments ⇄ FHIR Resources)

HL7 Segment	Equivalent FHIR Resource	Clinical Purpose
MSH	MessageHeader / Bundle
PID	Patient
PV1	Encounter
OBX	Observation
AL1	AllergyIntolerance
DG1	Condition
PR1	Procedure
OBR	DiagnosticReport