diff --git a/ig/input/fsh/nbs-obx-segment.fsh b/ig/input/fsh/nbs-obx-segment.fsh
index 946996b42..671a786f4 100644
--- a/ig/input/fsh/nbs-obx-segment.fsh
+++ b/ig/input/fsh/nbs-obx-segment.fsh
@@ -2,16 +2,26 @@ Logical: OBXSegment
 Id: segment-obx-logical-model
 Title: "OBX Segment"
 Description: "The OBX Segment"
-* setOBXId 1..1 SU string "OBX-1 (1) Birthweight an identifier"
-* valueType 1..1 SU string "OBX-2 A Value Type"
-* observationIdentifier 1..1 SU string "OBX-3 Observation Identifier"
-* observationSubID 1..1 SU string "OBX-4 (LOINC 54089-8) Observation Sub-ID"
-* observationValue 1..1 SU string "OBX-5 (LOINC or 99MDH) Observation Value"
-* units 1..1 SU string "OBX-6 Unit For Observation Value"
-* observationResultStatus 1..1 SU string "OBX-11 Observation Result Status"
-* dateTimeOfTheObservation 1..1 SU string "OBX-14 Date/time Of Observation"
-* observationType 1..1 SU string "OBX-29 Observation Type"
-* observationSubType 1..1 SU string "OBX-30 Observation Sub-type"
+* setOBXId 1..1 string "OBX-1 Set ID - OBX"
+* valueType 0..1 id "OBX-2 Value Type"
+* observationIdentifier 1..1 code "OBX-3 Observation Identifier"
+* identifier 1..1 string "OBX-3.1 Identifier"
+* observationtText 1..1 string "OBX-3.2 Text"
+* observationNameOfCodingSystem 1..1 id "OBX-3.3 Name of Coding System"
+* observationSubID 1..1 string "OBX-4 (LOINC 54089-8) Observation Sub-ID"
+* observationValue 1..1 string "OBX-5 (LOINC or 99MDH) Observation Value"
+* observationValueUnits 1..1 code "OBX-6 Units (Observation Value)"
+* obxValueUnitsIdentifier 1..1 code "OBX-6.1 (Unit) Identifier"
+* obxValueUnitsText 1..1 code "OBX-6.2 (Unit) Text"
+* obxValueUnitsNameOfCodingSystem 1..1 code "OBX-6.3 (Unit) Name of Coding System"
+* observationResultStatus 1..1 id "OBX-11 Observation Result Status"
+* dateTimeOfTheObservation 1..1 dateTime "OBX-14 Date/Time Of Observation"
+* obxResponsibleObserver 1..1 id "OBX-16 Responsible Observer"
+* observationMethod 1..1 code "OBX-17 Responsible Observer"
+* analysisDateTime 1..1 dateTime "OBX-19 Analysis Date/Time"
+* performingOrganizationName 1..1 code "OBX-23 Performing Organization Name"
+* performingOrganizationAddress 1..1 code "OBX-24 Performing Organization Address"
+* performingOrgMedDirector 1..1 code "OBX-25 Performing Organization Medical Director"
 // other optional
 
 
@@ -28,3 +38,17 @@ Usage: #definition
 * activity = http://terminology.hl7.org/CodeSystem/v3-DataOperation#CREATE
 * agent[+].type = http://terminology.hl7.org/CodeSystem/provenance-participant-type#author
 * agent[=].who.display = "T. R. Johnson"
+
+
+Instance: segment-obx-logical-model-history-update
+InstanceOf: Provenance
+Title: "addition of converted OBX segment fields and data type correction"
+Usage: #definition
+* target[+] = Reference(StructureDefinition/segment-obx-logical-model)
+* recorded = "2023-09-15T17:41:23.0000Z"
+* occurredDateTime = "2023-09-15"
+* reason = http://terminology.hl7.org/CodeSystem/v3-ActReason#METAMGT
+* reason.text = "changed the sub-segments to the ones the system will initially support."
+* activity = http://terminology.hl7.org/CodeSystem/v3-DataOperation#UPDATE
+* agent[+].type = http://terminology.hl7.org/CodeSystem/provenance-participant-type#author
+* agent[=].who.display = "T. Johnson"