> ## 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.

# composition_type_coding

Normalized `Composition.type.coding[]` property on the [Composition](https://hl7.org/fhir/R4/composition.html) FHIR resource.

**Primary Keys:**

* composition\_type\_coding\_id

**Foreign Keys:**

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

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

| Column                        | Data Type | Description                                         |
| ----------------------------- | --------- | --------------------------------------------------- |
| composition\_type\_coding\_id | varchar   | Unique identifier for the coding row                |
| composition\_id               | varchar   | FK to the parent composition 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:**

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