What does "crosswalking" mean in coding?

Crosswalking refers to the process of transitioning from one coding system to another, making it especially relevant in healthcare coding when updating from older systems or formats to newer ones. This process ensures that data remains consistent and accessible when different coding systems are used, such as moving from ICD-9 to ICD-10 or between various classification systems for different types of health information. By establishing a crosswalk—a mapping between codes in the old system and their equivalents in the new system—healthcare providers can maintain accuracy in patient data, billing, and reporting. This transition is crucial for facilitating correct billing practices and ensuring compliance with updated regulations in healthcare documentation and reporting.