Which CPT code is used for arthrocentesis of a small joint with ultrasound guidance?

The correct CPT code for arthrocentesis of a small joint with ultrasound guidance is 20604. This code specifically describes the procedure of aspirating or injecting a small joint, such as those in the fingers and toes, and it includes the use of ultrasound guidance, which is critical for ensuring precision and safety during the procedure.

CPT code 20604 is designated for arthrocentesis procedures performed on small joints when imaging guidance is employed, distinguishing it from other codes that apply to larger joints or those performed without imaging assistance. The presence of ultrasound guidance not only enhances the accuracy of the procedure but also aligns with the coding requirements specified by the American Medical Association (AMA).

In contrast, other codes listed refer to different procedures or joints. For instance, code 20600 pertains to large joint aspiration without imaging, while 20610 deals with aspiration or injection into a major joint, and 20611 is for aspiration/injection into a major joint with ultrasound guidance. Understanding these specific distinctions is key to selecting the appropriate code for accurate billing and documentation.