Which diagnosis should be listed first when sequencing inpatient codes using the UHDDS?

When sequencing inpatient codes using the Uniform Hospital Discharge Data Set (UHDDS), the principal diagnosis should be listed first. The principal diagnosis is defined as the condition that led to the admission of the patient for treatment. If multiple conditions are present, the one that is chiefly responsible for the patient's hospital stay takes precedence in the coding. Accurate sequencing is crucial for proper billing and health data reporting.