Format/Length:See DATE 
National Codes: 
Default Codes: 

DATE FIRST SEEN is the same as attribute ACTIVITY DATE where the ACTIVITY DATE TYPE is National Code 'Date First Seen'.

For the National Cancer Waiting Times Monitoring Data Set and Cancer Outcomes and Services Data Set, DATE FIRST SEEN:

For the HIV and AIDS Reporting Data Set, DATE FIRST SEEN is the DATE the PATIENT was first seen for Human Immunodeficiency Virus (HIV) care at a HIV Clinic Attendance at the current Health Care Provider.