---
schema_version: "1"
id: e228a472c7ea7e14725f8c4f78bfa1f714add20f2afde40467bd4b8cb65c00aa
title: CX - Extended Composite ID With Check Digit
collection: legacydeveloper
version: current
locale: en-us
portal_url: https://docs.salesforce.com/legacydeveloper/current/en-us/life_sciences_dev_guide/map_hl7_CX.md
canonical_url: https://developer.salesforce.com/docs/atlas.en-us.life_sciences_dev_guide.meta/life_sciences_dev_guide/map_hl7_CX.htm
source_site: developer.salesforce.com
content_type: documentation
content_hash: 34255f699d6074b834993a39e8b90a4bc7558590904b7ab509b683cff79c74ff
description: The Extended Composite ID With Check Digit (CX) HL7 segment maps to the Identifier object in Salesforce.
---
# CX - Extended Composite ID With Check Digit

The Extended Composite ID With Check Digit (CX) HL7 segment maps to the Identifier object in Salesforce.

## HL7 V2.3 - Clinical Data Model Mapping

Here’s how the segments defined by HL7 V2.3 for CX map to fields in Salesforce standard objects.

![Note](https://developer.salesforce.com/docs/atlas.en-us.life_sciences_dev_guide.meta/life_sciences_dev_guide/images/icon_note.png)

#### Note

Only the segments supported by Salesforce are mentioned below.

Table 1. CX - Salesforce
| CX | Salesforce Field | Type | Notes |
| --- | --- | --- | --- |
| CX.1 - ID | Identifier.IdValue | String | N/A |
| CX.4 - Assigning Authority | Identifier.IssuingAuthority | Lookup: Account | N/A |
| CX.5 - Identifier Type Code | Identifier.IdType | Lookup: CodeSet, CodeSet​Bundle | N/A |