> ## 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.

# Add Patient to Cohorts

> Adds a single patient to multiple cohorts at once. Returns all cohorts the  patient is associated with.

For more information, see the [guide about Cohorts](/medical-api/handling-data/cohorts)

## Path Params

<ParamField path="id" type="string" required>
  The ID of the patient to add to cohorts.
</ParamField>

## Body

<ParamField body="cohortIds" type="string[]" required>
  Array of cohort IDs to add the patient to.
</ParamField>

## Response

<ResponseField name="cohorts" type="Cohort[]" required>
  Array of cohorts the patient is currently associated with.

  <Expandable title="Cohort properties">
    <Snippet file="cohort-response.mdx" />
  </Expandable>
</ResponseField>

<ResponseExample>
  ```javascript Metriport SDK theme={null}
  import { MetriportMedicalApi } from "@metriport/api-sdk";

  const metriport = new MetriportMedicalApi("YOUR_API_KEY");

  const patientId = "00000000-0000-0000-0000-000000000000";
  const result = await metriport.addPatientToCohorts(patientId, {
    cohortIds: [
      "00000000-0000-0000-0000-000000000000", 
      "11111111-1111-1111-1111-111111111111"
    ]
  });
  ```
</ResponseExample>

<Snippet file="cohort-list-response-json.mdx" />

## Notes

* If the patient is already in some of the specified cohorts, those will be skipped (no error thrown)