> ## 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_code_coding

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

**Primary Keys:**

* observation\_code\_coding\_id

**Foreign Keys:**

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

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

| Column                        | Data Type | Description                          |
| ----------------------------- | --------- | ------------------------------------ |
| observation\_code\_coding\_id | varchar   | Unique identifier for the coding row |
| observation\_id               | varchar   | Parent observation                   |
| code\_rank†                   | int       | 1-based index                        |
| code                          | varchar   | Code value                           |
| display                       | varchar   | Human-readable display               |
| system                        | varchar   | Code system URI                      |

**Related Tables:**

**Parent:**

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