> ## Documentation Index
> Fetch the complete documentation index at: https://docs.metriport.com/llms.txt
> Use this file to discover all available pages before exploring further.

# device_extension

Normalized `Device.extension[]` property on the [Device](https://hl7.org/fhir/R4/device.html) FHIR resource.

**Primary Keys:**

* device\_extension\_id

**Foreign Keys:**

* device\_id - links to the [device](/medical-api/handling-data/schema-v100/device/base) table

<div style={{textAlign: 'right'}}><sub>† Metriport Platform added</sub></div>

| Column                     | Data Type | Description                                            |
| -------------------------- | --------- | ------------------------------------------------------ |
| device\_extension\_id      | varchar   | Unique identifier for the extension row                |
| device\_id                 | varchar   | FK to the parent device record                         |
| extension\_rank†           | int       | 1-based position of this extension in the source array |
| url                        | varchar   | Extension URL identifying the extension type           |
| valuestring                | varchar   | String value                                           |
| valueboolean               | bool      | Boolean value                                          |
| valuecode                  | varchar   | Code value                                             |
| valuedatetime              | datetime  | Datetime value                                         |
| valueinteger               | int       | Integer value                                          |
| valuedecimal               | numeric   | Decimal value                                          |
| valuecoding\_code          | varchar   | Coding code value                                      |
| valuecoding\_display       | varchar   | Coding display text                                    |
| valuecoding\_system        | varchar   | Coding system URI                                      |
| valuecodeableconcept\_text | varchar   | CodeableConcept text                                   |
| valuereference\_reference  | varchar   | Reference value                                        |

**Related Tables:**

**Parent:**

* [device](/medical-api/handling-data/schema-v100/device/base)

**Child:**

* [device\_extension\_vcc\_coding](/medical-api/handling-data/schema-v100/device/extension_vcc_coding)