| Code | Display | Definition | V2 Concept Comment | V2 Concept Comment As Published | V2 Concept Comment | V2 Concept Comment As Published |
| OBR-OBX | OBX segment following an OBR segment | OBX segment following an OBR segment | For responses related to the test order, For responses related to the test order, For responses related to the test order | For responses related to the test order, For responses related to the test order, For responses related to the test order | For responses related to the test order, For responses related to the test order, For responses related to the test order | For responses related to the test order, For responses related to the test order, For responses related to the test order |
| SPM-OBX | OBX segment following an SPM segment | OBX segment following an SPM segment | For responses related to the specimen, For responses related to the specimen, For responses related to the specimen | For responses related to the specimen, For responses related to the specimen, For responses related to the specimen | For responses related to the specimen, For responses related to the specimen, For responses related to the specimen | For responses related to the specimen, For responses related to the specimen, For responses related to the specimen |
| DG1-3 | Diagnosis Code | Diagnosis Code | | | | |
| NK1-11 | Next of Kin / Associated Parties Job Code/Class | Next of Kin / Associated Parties Job Code/Class | Used to convey patient's or next of kin's employment job class code, Used to convey patient's or next of kin's employment job class code, Used to convey patient's or next of kin's employment job class code | Used to convey patient's or next of kin's employment job class code, Used to convey patient's or next of kin's employment job class code, Used to convey patient's or next of kin's employment job class code | Used to convey patient's or next of kin's employment job class code, Used to convey patient's or next of kin's employment job class code, Used to convey patient's or next of kin's employment job class code | Used to convey patient's or next of kin's employment job class code, Used to convey patient's or next of kin's employment job class code, Used to convey patient's or next of kin's employment job class code |
| NK1-13 | Organization Name - NK1 | Organization Name - NK1 | Next of kin's organization name, Next of kin's organization name, Next of kin's organization name | Next of kin's organization name, Next of kin's organization name, Next of kin's organization name | Next of kin's organization name, Next of kin's organization name, Next of kin's organization name | Next of kin's organization name, Next of kin's organization name, Next of kin's organization name |
| NK1-28 | Ethnic Group | Ethnic Group | Next of kin's ethnicity, Next of kin's ethnicity, Next of kin's ethnicity | Next of kin's ethnicity, Next of kin's ethnicity, Next of kin's ethnicity | Next of kin's ethnicity, Next of kin's ethnicity, Next of kin's ethnicity | Next of kin's ethnicity, Next of kin's ethnicity, Next of kin's ethnicity |
| NK1-35 | Race | Race | Next of kin's race, Next of kin's race, Next of kin's race | Next of kin's race, Next of kin's race, Next of kin's race | Next of kin's race, Next of kin's race, Next of kin's race | Next of kin's race, Next of kin's race, Next of kin's race |
| OBR-16 | Ordering Provider | Ordering Provider | | | | |
| OBR-13 | Relevant Clinical Information | Relevant Clinical Information | The purpose varies based on the AOE referencing this field., The purpose varies based on the AOE referencing this field., The purpose varies based on the AOE referencing this field. | The purpose varies based on the AOE referencing this field., The purpose varies based on the AOE referencing this field., The purpose varies based on the AOE referencing this field. | The purpose varies based on the AOE referencing this field., The purpose varies based on the AOE referencing this field., The purpose varies based on the AOE referencing this field. | The purpose varies based on the AOE referencing this field., The purpose varies based on the AOE referencing this field., The purpose varies based on the AOE referencing this field. |
| OBR-49 | Result Handling | Result Handling | This was used for call or fax results back, This was used for call or fax results back, This was used for call or fax results back | This was used for call or fax results back, This was used for call or fax results back, This was used for call or fax results back | This was used for call or fax results back, This was used for call or fax results back, This was used for call or fax results back | This was used for call or fax results back, This was used for call or fax results back, This was used for call or fax results back |
| PID-11 | Patient Address | Patient Address | Applies to patient, Applies to patient, Applies to patient | Applies to patient, Applies to patient, Applies to patient | Applies to patient, Applies to patient, Applies to patient | Applies to patient, Applies to patient, Applies to patient |
| PID-3 | Patient Identifier List | Patient Identifier List | Applies to patient, Applies to patient, Applies to patient | Applies to patient, Applies to patient, Applies to patient | Applies to patient, Applies to patient, Applies to patient | Applies to patient, Applies to patient, Applies to patient |
| PID-5 | Patient Name | Patient Name | Applies to patient, Applies to patient, Applies to patient | Applies to patient, Applies to patient, Applies to patient | Applies to patient, Applies to patient, Applies to patient | Applies to patient, Applies to patient, Applies to patient |
| PID-6 | Mother's Maiden Name | Mother's Maiden Name | Applies to patient, Applies to patient, Applies to patient | Applies to patient, Applies to patient, Applies to patient | Applies to patient, Applies to patient, Applies to patient | Applies to patient, Applies to patient, Applies to patient |
| PID-7 | Date/Time of Birth | Date/Time of Birth | Applies to patient, Applies to patient, Applies to patient | Applies to patient, Applies to patient, Applies to patient | Applies to patient, Applies to patient, Applies to patient | Applies to patient, Applies to patient, Applies to patient |
| PID-13 | Phone Number - Home | Phone Number - Home | deprecated field as of v2.7, deprecated field as of v2.7, deprecated field as of v2.7 | deprecated field as of v2.7, deprecated field as of v2.7, deprecated field as of v2.7 | deprecated field as of v2.7, deprecated field as of v2.7, deprecated field as of v2.7 | deprecated field as of v2.7, deprecated field as of v2.7, deprecated field as of v2.7 |
| PID-14 | Phone Number - Business | Phone Number - Business | deprecated field as of v2.7, deprecated field as of v2.7, deprecated field as of v2.7 | deprecated field as of v2.7, deprecated field as of v2.7, deprecated field as of v2.7 | deprecated field as of v2.7, deprecated field as of v2.7, deprecated field as of v2.7 | deprecated field as of v2.7, deprecated field as of v2.7, deprecated field as of v2.7 |
| PID-40 | Phone Number | Phone Number | New field in V2.7, New field in V2.7, New field in V2.7 | New field in V2.7, New field in V2.7, New field in V2.7 | New field in V2.7, New field in V2.7, New field in V2.7 | New field in V2.7, New field in V2.7, New field in V2.7 |
| PRT-5 | Participation Person | Participation Person | | | | |
| SPM-4 | Specimen Type | Specimen Type | | | | |
| SPM-8 | Specimen Source Site | Specimen Source Site | | | | |