> ## 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.

# documentreference_extension_vcc_coding

Normalized `DocumentReference.extension[].valueCodeableConcept.coding[]` property on the [DocumentReference](https://hl7.org/fhir/R4/documentreference.html) FHIR resource.

**Primary Keys:**

* documentreference\_extension\_vcc\_coding\_id

**Foreign Keys:**

* documentreference\_extension\_id - links to the [documentreference\_extension](/medical-api/handling-data/schema-v100/documentreference/extension) table

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

| Column                                        | Data Type | Description                                         |
| --------------------------------------------- | --------- | --------------------------------------------------- |
| documentreference\_extension\_vcc\_coding\_id | varchar   | Unique identifier for the coding row                |
| documentreference\_extension\_id              | varchar   | FK to the parent extension record                   |
| code\_rank†                                   | int       | 1-based position of this coding in the source array |
| code                                          | varchar   | Code value                                          |
| display                                       | varchar   | Human-readable display text                         |
| system                                        | varchar   | Coding system URI                                   |

**Related Tables:**

**Parent:**

* [documentreference\_extension](/medical-api/handling-data/schema-v100/documentreference/extension)