> ## 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.

# observation_category_coding

Normalized `Observation.category[].coding[]` property on the [Observation](https://hl7.org/fhir/R4/observation.html) FHIR resource.

**Primary Keys:**

* observation\_category\_coding\_id

**Foreign Keys:**

* observation\_category\_id - links to the [observation\_category](/medical-api/handling-data/schema-v100/observation/category) table

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

| Column                            | Data Type | Description                                   |
| --------------------------------- | --------- | --------------------------------------------- |
| observation\_category\_coding\_id | varchar   | Unique identifier                             |
| observation\_category\_id         | varchar   | FK to the parent observation\_category record |
| code\_rank†                       | int       | 1-based index                                 |
| code                              | varchar   | Code value                                    |
| display                           | varchar   | Display                                       |
| system                            | varchar   | Code system URI                               |

**Related Tables:**

**Parent:**

* [observation\_category](/medical-api/handling-data/schema-v100/observation/category)