What does a circle with a line through it signify in CPT coding?

A circle with a line through it in CPT coding signifies an exemption from the use of modifier -51. Modifier -51 is used to indicate multiple procedures performed during the same session, which typically requires the primary procedure to be billed at its full value while the additional procedures may be subject to reduced reimbursement. However, when a code is marked with a circle and a line, it indicates that this specific procedure is not subject to the usual multiple procedure discounting. Therefore, it allows the coder to report this particular procedure without applying modifier -51, ensuring that it is reimbursed at the full value as intended.

Understanding this symbol is crucial for accurate coding and billing practices, as it helps clarify which procedures can be billed fully when multiple services are provided during a single patient encounter.