| Code | Display | Definition |
| DE1 | Unique identifier | Unique identifier for the client, according to the policies applicable to each country. There can be more than one unique identifier used to link records (e.g. national identification [ID], health ID, immunization information system ID, medical record ID) |
| DE2 | Name | The full name of the client |
| DE3 | First name | Client's first name or given name |
| DE4 | Family name | Client's family name or last name |
| DE5 | Sex | Documentation of a specific instance of sex information for the client |
| DE6 | Male | Client's biological sex is male |
| DE7 | Female | Client's biological sex is female |
| DE8 | Biological sex not specified | Client's biological sex is not specified |
| DE9 | Intersex | Client's biological sex is intersex |
| DE10 | Date of birth | Client's date of birth (DOB) if known; if unknown, use assigned DOB for administrative purposes |
| DE13 | Age | The client's calculated age (presented as number of years, months, weeks, days) based on the DOB and the visit date |
| DE14 | Caregivers (multiple) | Details of the client's caregiver (person) who could be next of kin (e.g. partner, husband, mother, sibling, etc.) |
| DE15 | Caregiver's full name | The full name of the client's caregiver |
| DE16 | Caregiver's first name | First or given name of the client's caregiver |
| DE17 | Caregiver's family name | Family name or last name of the client's caregiver |
| DE18 | Contact phone number | Client's phone number; can be a landline or a mobile phone number |
| DE19 | Address | Client's home address or address that the client is consenting to disclose |