The NHS 111 First service encourages patients to call NHS 111 for triage before attending accident and emergency (A&E) services.

The collection was launched in 2021 and commissioners of Integrated Urgent Care (IUC) or NHS 111 services submitted aggregate data weekly to NHS England and NHS Improvement.

In June 2021, the data items collected in DCB3126 were incorporated into the collection DCB3031 Amd 6/2021 Integrated Urgent Care Aggregate Data Collection (IUC ADC), leading to the retirement of this separate DCB3126 collection.