Final answer:
In the CPT manual, a red circle identifies new codes, helping professionals to stay updated with the latest coding changes for accurate medical billing.
Step-by-step explanation:
In the Current Procedural Terminology (CPT) manual, a red circle is used to identify a new code. This symbol is placed next to the code number to alert users that it has been recently added to the manual. In contrast, other symbols like a red triangle indicate revised codes, and blue triangles denote resequenced codes. It's important for medical professionals to stay up-to-date with these designations to ensure accurate coding and billing for medical services and procedures.