Which code reports externally generated, superficial hyperthermia?

The code that correctly reports externally generated, superficial hyperthermia is 77600. This code is specifically designated for the application of hyperthermia treatment that is achieved through external means—such as infrared radiation or microwave therapy—targeting superficial tissues.

In the context of coding, selecting 77600 reflects appropriate specificity for procedures involving the delivery of controlled heat to treat conditions such as superficial tumors or to support other therapeutic interventions. The focus on the term "superficial" indicates that the treatment is not intended to penetrate deeply into body tissues but rather is aimed at tissues closer to the surface, which aligns with the definition of superficial hyperthermia.

Other choices you provided do not align with the definition or the categories needed for this specific treatment code. For instance, codes like J2425 typically pertain to medications or injections and do not describe hyperthermia treatments, while H0023 and 89300 relate to different procedures or conditions entirely. Therefore, 77600 is the most suitable and accurate code for reporting this type of hyperthermic treatment.