Code 97035 is associated with which physical therapy modality?

• A. Traction, mechanical
• B. Iontophoresis
• C. Laser
• D. Ultrasound

Answer: (D)

Ultrasound therapy is what 97035 codes for. This modality uses high-frequency sound waves delivered through a transducer with a gel interface to reach soft tissues. When applied continuously, it generates heat in deeper tissues, boosting blood flow, reducing stiffness, and aiding tissue extensibility for healing and pain reduction. Pulsed ultrasound delivers energy in bursts, producing non-thermal effects like cavitation and microstreaming that can stimulate cellular activity without significant heating. This combination makes it a versatile choice for soft tissue injuries, tendinopathies, and postoperative stiffness.

Traction is a mechanical pulling method coded differently, iontophoresis uses electrical current to drive medications into tissue, and laser uses light energy. These modalities have distinct mechanisms and coding, which is why ultrasound corresponds to this code.