CPT® Code 61642

Add-On Code

Balloon dilatation of intracranial vasospasm, percutaneous; each additional vessel in different vascular territory (List separately in addition to code for primary procedure)

Balloon dilatation of intracranial vasospasm is a specialized endovascular procedure aimed at alleviating vasospasm, which is the constriction of blood vessels due to the smooth muscle lining's abnormal contraction. This condition often arises following a subarachnoid hemorrhage, where blood leaks into the space surrounding the brain, leading to changes in the vessel's intima. These changes can result in narrowing and rigidity of the vessel wall, impeding blood flow and potentially causing serious complications. The procedure involves a series of carefully orchestrated steps, beginning with the preparation of the access site, where the skin is cleansed and a local anesthetic is administered to minimize discomfort. A small incision is made to access the blood vessel, allowing for the insertion of a needle followed by a sheath. Through this sheath, a microcatheter or neurointerventional guidewire is navigated from the access artery into the carotid circulation, targeting the specific intracranial artery affected by vasospasm. Once the artery is selectively catheterized, diagnostic arteriography is performed to assess the vascular anatomy and confirm the need for balloon dilatation. If indicated, the procedure continues with the placement of a balloon catheter across the arterial lesion, which is then inflated under fluoroscopic guidance to dilate the narrowed segment. This intervention is critical for restoring normal blood flow and preventing further neurological deficits. The code 61642 specifically refers to the balloon dilatation of each additional vessel in a different vascular territory, performed in conjunction with the primary procedure, ensuring accurate coding and billing for the services rendered.