# AllergyReaction

Model ID: `ehr.AllergyReaction`

No description.

Type: `object`

## Fields

| Field | Type | Required | Format | Allowed values | Default | Nullable | Description |
|---|---|---:|---|---|---|---:|---|
| `manifestation` | `string` | Yes |  |  |  | No | e.g. Hives, Anaphylaxis, Nausea |
| `manifestation_code` | [`ehr.CodedConcept`](./ehr.CodedConcept.md) | No |  |  | `null` | Yes | SNOMED-CT coded manifestation for FHIR |
| `notes` | `string|null` | No |  |  | `null` | Yes | Free-text notes about the reaction, when present. |
| `onset` | `string|null` | No |  |  | `null` | Yes | Date the reaction first occurred, when known. |
| `severity` | [`ReactionSeverity`](./ReactionSeverity.md) | No |  |  | `null` | Yes | Severity of the reaction: mild, moderate, severe, or life_threatening. |

## Example

None declared in canonical OpenAPI.