Why must both the ICD-10-CM index and its tabular list be used during code assignment?

Using both the ICD-10-CM index and its tabular list is essential because each serves a unique purpose that ensures accurate and complete code assignment. The index provides an alphabetical list of terms that help identify the right codes based on the medical language of diagnoses. However, it may not contain comprehensive details necessary for making a final coding decision.

The tabular list, on the other hand, offers a structured presentation of codes along with additional information, including guidelines, notes for coding, and the importance of specificity. This section helps coders verify the accuracy and relevance of the code selected from the index.

Relying on only one of these resources may potentially result in missing critical information that could affect the overall coding accuracy. By utilizing both, coders can ensure that they are capturing all relevant details and adhering to coding standards, ultimately leading to more precise coding and improved patient documentation. This practice emphasizes the importance of a comprehensive approach to medical coding where both resources complement each other in verifying information needed to accomplish accurate coding.