38724

Cervical lymphadenectomy (modified radical neck dissection)

CPT code 38724 describes a modified radical neck dissection (MRND), a major surgical procedure involving the systematic removal of cervical lymph nodes from levels I through V. Unlike a radical neck dissection (CPT 38720), the modified approach aims to preserve one or more of the three major non-lymphatic structures: the spinal accessory nerve (CN XI), the internal jugular vein (IJV), and the sternocleidomastoid muscle (SCM). The clinical objective is to achieve the same oncological clearance of metastatic regional disease as a radical dissection while significantly reducing postoperative morbidity, such as chronic shoulder pain, facial edema, and functional neck limitations. This procedure is commonly categorized into three types: Type I preserves the spinal accessory nerve; Type II preserves the nerve and the internal jugular vein; and Type III (often called functional neck dissection) preserves all three structures. The surgery begins with extensive skin flaps, followed by the identification of the boundaries of the neck, including the mandible, clavicle, trapezius, and midline. The surgeon performs a meticulous dissection of the lymph node chains along the carotid sheath and within the posterior triangle. Deep structures such as the phrenic nerve, brachial plexus, and vagus nerve are identified and protected throughout the operation. Because of the complexity involved in preserving delicate vascular and neurological structures while ensuring a complete nodal sweep, this procedure requires high-level surgical expertise and detailed knowledge of cervical anatomy.

Clinical Indications

  • Biopsy-proven metastatic squamous cell carcinoma of the head and neck
  • Clinically or radiographically positive lymphadenopathy (N+) involving multiple neck levels
  • Metastatic thyroid carcinoma with extensive lateral neck involvement
  • Malignant salivary gland tumors with documented cervical metastasis
  • Malignant melanoma of the scalp or face with suspected or proven regional spread
  • Recurrent head and neck cancer following primary radiation therapy or chemoradiation
  • Salvage surgery for persistent nodal disease after non-surgical treatment

Procedure Steps

  1. Positioning the patient in the supine position with the neck extended and rotated away from the operative side.
  2. Making the surgical incision (e.g., apron, Y-shaped, or MacFee incision) and raising subplatysmal flaps.
  3. Exposing the boundaries of the dissection: the inferior border of the mandible, the clavicle, the anterior border of the trapezius, and the strap muscles at the midline.
  4. Identifying and preserving the spinal accessory nerve (CN XI) as it enters the sternocleidomastoid muscle and crosses the posterior triangle.
  5. Dissecting Level I (submental and submandibular nodes), including the removal of the submandibular gland if indicated.
  6. Dissecting Levels II, III, and IV (upper, middle, and lower jugular chains) by mobilizing the internal jugular vein and preserving it if tumor involvement allows.
  7. Dissecting Level V (posterior triangle nodes) located between the posterior border of the SCM and the trapezius.
  8. Identifying and protecting the carotid artery, vagus nerve, phrenic nerve, and hypoglossal nerve.
  9. Ensuring meticulous hemostasis and performing a saline leak test for potential thoracic duct injury (especially on the left side).
  10. Placing closed-suction drains and closing the skin flaps in anatomical layers.

Coding Guidelines

  • CPT 38724 is a unilateral procedure. For bilateral modified radical neck dissection, append modifier 50.
  • Do not report 38724 in conjunction with 38720 (radical neck dissection) or 38700 (suprahyoid lymphadenectomy) on the same side of the neck.
  • If a primary tumor resection (e.g., total laryngectomy, glossectomy, or parotidectomy) is performed at the same session, code the primary procedure separately.
  • For 'selective' neck dissections where only specific levels (e.g., II-IV) are removed, code 38724 should not be used; instead, use the appropriate selective dissection code or 38999 if no specific code exists, though 38724 is strictly for levels I-V.
  • The preservation of any one of the three structures (SCM, IJV, or CN XI) qualifies the procedure as 'modified radical' rather than 'radical'.

Associated ICD-10 Codes