CPT® Code 64412

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The procedure described by CPT® Code 64412 involves the injection of an anesthetic agent into the spinal accessory nerve, which is also known as cranial nerve XI (CN XI). This nerve plays a crucial role in innervating the trapezius muscle and the posterior triangle of the neck, making it significant in both diagnostic and therapeutic contexts. The injection, commonly referred to as a nerve block, can be utilized to alleviate pain or discomfort associated with conditions affecting the trapezius muscle or surrounding areas. The spinal accessory nerve exits the skull through the jugular foramen and traverses the upper and middle thirds of the sternocleidomastoid muscle, which is a key landmark during the procedure. Prior to the injection, the skin over the junction of the upper and middle thirds of the sternocleidomastoid muscle is thoroughly cleansed to minimize the risk of infection. The posterior border of the sternocleidomastoid muscle is then identified, and a needle is carefully inserted to deliver the anesthetic agent directly into the spinal accessory nerve, providing targeted relief for the patient.