> ## 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.

# coverage_extension

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

**Primary Keys:**

* coverage\_extension\_id

**Foreign Keys:**

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

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

| Column | Data Type | Description |
| - | - | - |
| coverage\_extension\_id | varchar | Unique identifier for the extension row |
| coverage\_id | varchar | FK to the parent coverage 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:**

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

**Child:**

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


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