> ## 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.

# Basic

> Basic is used for handling concepts not yet defined in FHIR, narrative-only resources that don't map to an existing resource, and custom resources not appropriate for inclusion in the FHIR specification.

## Properties

| Name       | Required | Type                                                                                                                                                                                                                                                                                                             | Description                           |
| ---------- | -------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------- |
| identifier | No       | [Identifier](/medical-api/fhir/data-types/identifier)\[]                                                                                                                                                                                                                                                         | Business identifier                   |
| code       | Yes      | [CodeableConcept](/medical-api/fhir/data-types/codeableconcept)                                                                                                                                                                                                                                                  | Kind of Resource                      |
| subject    | No       | Reference\<Resource>                                                                                                                                                                                                                                                                                             | Identifies the focus of this resource |
| created    | No       | date                                                                                                                                                                                                                                                                                                             | When created                          |
| author     | No       | Reference\<[Practitioner](/medical-api/fhir/resources/practitioner) / [PractitionerRole](/medical-api/fhir/resources/practitionerrole) / [Patient](/medical-api/fhir/resources/patient) / [RelatedPerson](/medical-api/fhir/resources/relatedperson) / [Organization](/medical-api/fhir/resources/organization)> | Who created                           |

## Search Parameters

| Name       | Type      | Description                           | Expression       |
| ---------- | --------- | ------------------------------------- | ---------------- |
| author     | reference | Who created                           | Basic.author     |
| code       | token     | Kind of Resource                      | Basic.code       |
| created    | date      | When created                          | Basic.created    |
| identifier | token     | Business identifier                   | Basic.identifier |
| patient    | reference | Identifies the focus of this resource | Basic.subject    |
| subject    | reference | Identifies the focus of this resource | Basic.subject    |

## Inherited Properties

| Name              | Required | Type                                                   | Description                                            |
| ----------------- | -------- | ------------------------------------------------------ | ------------------------------------------------------ |
| id                | No       | string                                                 | Logical id of this artifact                            |
| meta              | No       | [Meta](/medical-api/fhir/data-types/meta)              | Metadata about the resource                            |
| implicitRules     | No       | uri                                                    | A set of rules under which this content was created    |
| language          | No       | code                                                   | Language of the resource content                       |
| text              | No       | [Narrative](/medical-api/fhir/data-types/narrative)    | Text summary of the resource, for human interpretation |
| contained         | No       | Resource\[]                                            | Contained, inline Resources                            |
| extension         | No       | [Extension](/medical-api/fhir/data-types/extension)\[] | Additional content defined by implementations          |
| modifierExtension | No       | [Extension](/medical-api/fhir/data-types/extension)\[] | Extensions that cannot be ignored                      |

To view the FHIR specification for this resource, see [Basic](https://www.hl7.org/fhir/StructureDefinition/Basic).