A record is given a CMG at the time of:

The Canadian Classification of Health Interventions (CCI) and the Canadian Mortality Database (CMG) are typically used to classify hospital cases based on the resources consumed. A case is assigned a Case Mix Group (CMG) at the time of coding, which occurs after patient discharge when all relevant clinical data have been documented, coded, and reviewed.

The purpose of assigning a CMG during the coding process is to group cases that exhibit similar clinical characteristics and require similar levels of care, allowing for standardized resource allocation and funding. This classification relies on complete billing and clinical data, which is fully available only after the patient's stay in the hospital has concluded.

This is why the option that states a record is given a CMG at the time of coding is correct. A CMG assignment cannot be accurately made prior to this point, as complete clinical information is essential for proper classification. Other options, which suggest assigning a CMG at admission or discharge, do not align with the procedural framework established by health information management practices in Canada.