| # | Name | Source | Ver | Description | |
| 1 | Alias Status of a Death Roster | hl7.fhir.us.vrdr#current | R4 | Alias Status of a Death Roster. If true, is an alias record. | |
| 2 | First created | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | Indicates when this resource ID was first associated with content on this server. | |
| 3 | Last source sync | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | Indicates when the data was last accessed from its original source. | |
| 4 | Replacement Status of a Death Record (deprecated) | hl7.fhir.us.vrdr#current | R4 | Replacement Status of a Death Record. The use of this extension has been deprecated and wil be ignored for NCHS submissions. See the [NCHS Vital Records Messaging IG](https://build.fhir.org/ig/nightingaleproject/vital_records_fhir_messaging_ig/branches/main/message.html#message-structure-and-content) for a description of how to specify replace status at the message level. | |
| 5 | Timezone Code | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | An IANA timezone code for the timezone offset per [BCP 175](https://www.iana.org/go/rfc6557). The offset is specified as part of a dateTime/instant (or using the tzOffset extension on a date if necessary). The timezone code may also be provided to allow for human display of the location associated with the offset. |
| 1 | 2 | 3 | 4 | 5 | |
| Extension | C D | C D | C D | ||
| Extension.extension | C | C | C | C | C |
| Extension.url | F | F | F | F | F |
| Extension.value[x] | C | C | C | C B M | C B M |
Produced 08 Sep 2023