What does the instruction "Code first" suggest in ICD-10-CM coding?

The instruction "Code first" in ICD-10-CM coding indicates that coders should prioritize sequencing the underlying condition before any associated conditions or manifestations. This is important because it emphasizes the primary reason for the patient's encounter and allows for a more accurate representation of the patient's health status.

When "Code first" is present, it guides coders to identify and code the main condition that is responsible for the other related codes. This approach assists healthcare providers in having a clearer understanding of the patient's condition as it attributes the root cause of the health issue, thereby facilitating appropriate treatment, insurance reimbursement, and statistical data collection.

This coding practice is crucial for maintaining accuracy in clinical documentation and ensuring that the healthcare provider's records comprehensively reflect the patient’s medical situation. Hence, the correct choice illustrates the importance of establishing a proper coding hierarchy in the context of complex medical scenarios.