| # | | Name | Source | Ver | Description |
| 1 | | AD Use | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | Uses of Addresses - codes not defined as part of Address.use. |
| 2 | | ADXP Additional Locator | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | This can be a unit designator, such as apartment number, suite number, or floor. There may be several unit designators in an address (e.g., "3rd floor, Appt. 342"). This can also be a designator pointing away from the location, rather than specifying a smaller location within some larger one (e.g., Dutch "t.o." means "opposite to" for house boats located across the street facing houses). |
| 3 | | ADXP Building Number Suffix | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | Any alphabetic character, fraction or other text that may appear after the numeric portion of a building number. |
| 4 | | ADXP Care Of | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | The name of the party who will take receipt at the specified address, and will take on responsibility for ensuring delivery to the target recipient. |
| 5 | | ADXP Census Tract | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | A geographic sub-unit delineated for demographic purposes. |
| 6 | | ADXP Delimiter | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | Delimiters are printed without framing white space. If no value component is provided, the delimiter appears as a line break. |
| 7 | | ADXP Delivery Address Line | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | A delivery address line is frequently used instead of breaking out delivery mode, delivery installation, etc. An address generally has only a delivery address line or a street address line, but not both. |
| 8 | | ADXP Delivery Installation Area | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | The location of the delivery installation, usually a town or city, and is only required if the area is different from the municipality. Area to which mail delivery service is provided from any postal facility or service such as an individual letter carrier, rural route, or postal route. |
| 9 | | ADXP Delivery Installation Qualifier | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | A number, letter or name identifying a delivery installation. For example, for Station A, the delivery installation qualifier would be 'A'. |
| 10 | | ADXP Delivery Installation Type | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | Indicates the type of delivery installation (the facility to which the mail will be delivered prior to final shipping via the delivery mode.) Example: post office, letter carrier depot, community mail center, station, etc. |
| 11 | | ADXP Delivery Mode | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | Indicates the type of service offered, method of delivery. For example: post office box, rural route, general delivery, etc. |
| 12 | | ADXP Delivery Mode Identifier | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | Represents the routing information such as a letter carrier route number. It is the identifying number of the designator (the box number or rural route number). |
| 13 | | ADXP Direction | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | Direction (e.g., N, S, W, E). |
| 14 | | ADXP House Number | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | The number of a building, house or lot alongside the street. Also known as "primary street number". This does not number the street but rather the building. |
| 15 | | ADXP House Number Numeric | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | The numeric portion of a building number. |
| 16 | | ADXP Post Box | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | A numbered box located in a post station. |
| 17 | | ADXP Precinct | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | A subsection of a municipality. |
| 18 | | ADXP Street Address Line | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | A street address line is frequently used instead of breaking out building number, street name, street type, etc. An address generally has only a delivery address line or a street address line, but not both. |
| 19 | | ADXP Street Name | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | streetName. |
| 20 | | ADXP Street Name Base | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | The base name of a roadway or artery recognized by a municipality (excluding street type and direction). |
| 21 | | ADXP Street Name Type | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | The designation given to the street. (e.g. Street, Avenue, Crescent, etc.). |
| 22 | | ADXP Unit ID | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | The number or name of a specific unit contained within a building or complex, as assigned by that building or complex. |
| 23 | | ADXP Unit Type | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | Indicates the type of specific unit contained within a building or complex. E.g. Appartment, Floor. |
| 24 | | Confidential | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | Expresses the access policy associated with the element. |
| 25 | | Extended Contact Availability | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | The details provided in this contact may be used according to the attached availability guidelines. |
| 26 | | Geolocation | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | The absolute geographic location of the Location, expressed using the WGS84 datum (This is the same co-ordinate system used in KML). |
| 27 | | Human Language | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | The Human Language of the item. |
| 28 | | Patient No Fixed Address | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | This extension applies to the Address data type and is used to indicate that a location address is not a fixed address for an individual. |
| 29 | | Preferred | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | Flag denoting whether parent item is preferred - e.g., a preferred address or telephone number. |