| Original Column Name | Expanded Column Name | Description | 
            
                | ContactEntryHisID | Contact Entry History Identifier | A unique identifier for each historical record of a contact entry in the EHR system. | 
            
                | AppearOrder | Appearance Order | The sequential order in which the contact entries appear in the EHR system. | 
            
                | ContactID | Contact Identifier | The unique identifier for a contact within the EHR system. | 
            
                | ContactTypeID | Contact Type Identifier | A code or number that identifies the type of contact, such as patient, physician, insurance company, etc. | 
            
                | DateFrom | Date From | The start date for the period in which the contact entry is considered active or relevant. | 
            
                | DateInact | Date Inactive | The date on which the contact entry was marked as inactive in the EHR system. | 
            
                | DateTo | Date To | The end date for the period in which the contact entry is considered active or relevant. | 
            
                | IsActive | Is Active | A Boolean value indicating whether the contact entry is currently active. | 
            
                | IsActiveDate | Active Status Change Date | The date on which the active status of the contact entry last changed. | 
            
                | Notes | Notes | Additional information or commentary about the contact entry. | 
            
                | RecptID | Recipient Identifier | The unique identifier for the entity (e.g., a patient or a department) that is the recipient of the contact entry. | 
            
                | RecptTypeID | Recipient Type Identifier | A code or number that specifies the type of the recipient, such as an individual patient, a healthcare provider, or an organization. | 
            
                | RelationshipID | Relationship Identifier | A unique identifier that denotes the relationship between the contact and the recipient within the EHR system. | 
            
                | VendorID | Vendor Identifier | The unique identifier for the vendor associated with the contact entry. | 
            
                | ZUChkSum | ZU Checksum | An audit trail checksum used to verify the integrity of the contact entry history data for security and audit purposes. | 
            
                | ZUDate | ZU Date | The date associated with the audit log record for the contact entry history within the EHR system. | 
            
                | ZULogonHisID | ZU Logon History Identifier | An identifier for an entry in the audit log history that correlates with a user logon event. | 
            
                | Unnamed: 17 | Unnamed: Column 17 | Unlabeled or unrecognized column in the data set; content and purpose are unknown. | 
            
                | EMail | Email | The electronic mail address associated with the contact entry. | 
            
                | ContactTypeName | Contact Type Name | The descriptive name corresponding to the Contact Type Identifier, clarifying the type of contact (e.g., 'Primary Care Physician'). | 
            
                | Unnamed: 20 | Unnamed: Column 20 | Unlabeled or unrecognized column in the data set; content and purpose are unknown. | 
            
                | RelationshipName | Relationship Name | The descriptive name that corresponds to the Relationship Identifier, explaining the relationship (e.g., 'Emergency Contact'). |