64708

Neuroplasty; major peripheral nerve, arm or leg, open; other than specified

CPT 64708 refers to the surgical neuroplasty of a major peripheral nerve located in either the upper or lower extremities, specifically for nerves that are not addressed by other, more specific CPT codes in the 647xx series. This procedure is fundamentally an open surgical intervention aimed at decompressing a nerve that has become constricted, entrapped, or scarred. Major peripheral nerves included under this code may include the radial nerve in the upper arm, the femoral nerve in the thigh, or the sciatic nerve in the leg. Clinical scenarios necessitating this procedure often involve chronic compression syndromes, traumatic injuries resulting in significant perineural fibrosis, or repetitive strain injuries that have led to nerve dysfunction. During the operation, the surgeon creates a surgical opening to visualize the nerve directly. The primary objective is to 'free' the nerve from surrounding structures such as tight fascial bands, hypertrophied muscle, or dense scar tissue. This process, known as neuroplasty, helps restore the vascular supply to the nerve and allows for improved axonal conduction. In some instances, the surgeon may also perform an internal neurolysis, which involves the meticulous dissection of the nerve's internal fascicles to release internal scarring. By relieving the external and internal pressure, the procedure aims to mitigate symptoms like chronic pain, paresthesia, and muscle weakness, thereby improving the patient's overall quality of life and preventing permanent neurological damage. It is critical to differentiate this major nerve procedure from minor nerve neuroplasty or site-specific decompressions like carpal tunnel release.

Clinical Indications

  • Chronic major peripheral nerve entrapment or compression syndrome
  • Persistent neuropathic pain or paresthesia refractory to conservative management
  • Progressive motor weakness or muscle atrophy related to nerve compression
  • Post-traumatic perineural scarring or adhesions causing nerve dysfunction
  • Documented nerve conduction velocity (NCV) or electromyography (EMG) changes indicating entrapment

Procedure Steps

  1. Induction of general or regional anesthesia and limb tourniquet application if necessary.
  2. Identification and marking of the anatomical course of the major nerve.
  3. Making a longitudinal incision through the skin and subcutaneous tissue to expose the target area.
  4. Meticulous dissection through fascial layers to locate the major peripheral nerve (e.g., radial or sciatic).
  5. Direct visualization of the nerve to identify sites of constriction, scarring, or external compression.
  6. Performing neuroplasty by surgically releasing constricting bands, ligaments, or fibrotic tissue (neurolysis).
  7. Utilizing internal neurolysis with surgical magnification if intrinsic nerve scarring is present.
  8. Checking the nerve's mobility and ensuring it is free from tension or further impingement.
  9. Performing thorough hemostasis of the surgical field.
  10. Closure of the surgical wound in layers using appropriate suture materials.

Coding Guidelines

  • Do not report 64708 if a more specific neuroplasty code is available (e.g., 64718 for ulnar nerve at elbow, 64721 for median nerve at carpal tunnel).
  • Use 64708 for major nerves; use 64702 or 64704 for minor peripheral nerves.
  • If the procedure is performed bilaterally, append modifier 50.
  • Neuroplasty is generally considered bundled into more extensive nerve procedures such as nerve repair (neurorrhaphy) or nerve grafting when performed at the same site.
  • Code 69990 for the use of an operating microscope may be reported separately unless otherwise restricted by payer policy.
  • Modifier 51 may be appropriate if neuroplasty is performed on multiple different nerves during the same operative session.

Associated ICD-10 Codes