# ProviderIdentifier

Model ID: `ProviderIdentifier`

An external identifier beyond NPI and state licenses (DEA, tax ID, provider number, etc.).

Type: `object`

## Fields

| Field | Type | Required | Format | Allowed values | Default | Nullable | Description |
|---|---|---:|---|---|---|---:|---|
| `expiration_date` | `string|null` | No |  |  |  | Yes | ISO 8601 expiration date, optional. |
| `state` | `string|null` | No |  |  |  | Yes | For state license — two-letter state code |
| `type` | [`ProviderIdentifierType`](./ProviderIdentifierType.md) | Yes |  |  |  | No | Identifier system: NPI, DEA, SL (state license), TAX or PRN (provider number). |
| `value` | `string` | Yes |  |  |  | No | The identifier value. |

## Example

None declared in canonical OpenAPI.