> ## 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.

# Condition Chronicity

> Indicates whether a medical condition is chronic or not.

The chronicity extension is used in FHIR Condition resources to specify whether a medical condition is chronic.

## Properties

Example extension:

```json theme={null}
{
  "url": "http://hl7.org/fhir/StructureDefinition/condition-related",
  "valueCoding": {
    "code": "C",
    "display": "Chronic",
    "system": "https://public.metriport.com/fhir/StructureDefinition/condition-chronicity.json"
  }
}
```

<ResponseField name="url" type="string" required>
  The URL of this extension's JSON structure specification.
</ResponseField>

<ResponseField name="valueCoding" type="object" required>
  Contains the chronicity classification of the condition.
</ResponseField>

<ResponseField name="valueCoding.code" type="string" required>
  The code indicating chronicity status. Currently supports:

  * "C" for Chronic
  * "NC" for Not-Chronic
  * "U" for Unknown
</ResponseField>

<ResponseField name="valueCoding.display" type="string" required>
  The human-readable display text for the chronicity status.
</ResponseField>

<ResponseField name="valueCoding.system" type="string" required>
  The system that defines the chronicity codes.
</ResponseField>