61510

Craniectomy, trephination, bone flap craniotomy; for excision of brain tumor, supratentorial, except meningioma

Current Procedural Terminology (CPT) code 61510 represents a major neurosurgical procedure involving a craniectomy, trephination, or bone flap craniotomy specifically performed for the excision of a supratentorial brain tumor, excluding meningiomas. The supratentorial region of the brain is located above the tentorium cerebelli and includes the cerebrum (frontal, parietal, temporal, and occipital lobes) as well as the diencephalon. Tumors commonly addressed under this code include primary glial tumors such as astrocytomas, glioblastoma multiforme (GBM), oligodendrogliomas, as well as metastatic brain tumors from primary cancers elsewhere in the body. The procedure begins with the patient under general endotracheal anesthesia. The head is rigidly secured using a skull clamp, and neuronavigation systems are typically registered to precisely localize the tumor. The surgeon makes a planned scalp incision and reflects the scalp flap. Burr holes are then drilled into the skull, and a craniotome is utilized to cut between the holes, creating a removable bone flap (craniotomy). In some cases, the bone is nibbled away or not replaced (craniectomy). The dura mater is carefully incised and reflected to expose the underlying brain parenchyma. Under direct microscopic visualization, the surgeon navigates through the brain tissue to access the tumor. Various techniques and instruments, including bipolar electrocautery, ultrasonic aspirators, and microsurgical dissectors, are used to carefully isolate and resect the neoplastic tissue while preserving adjacent eloquent brain structures. Following maximal safe resection of the tumor, meticulous hemostasis is achieved in the tumor bed. The dura mater is then closed primarily or with a dural graft. If a bone flap was removed, it is typically repositioned and secured using titanium microplates and screws. The scalp is closed in multiple anatomic layers. This code strictly excludes the excision of meningiomas, which are coded separately, as well as tumors located in the infratentorial compartment (such as the cerebellum or brainstem). Careful documentation of the tumor type, anatomical location, and surgical approach is absolutely vital to ensure accurate coding, proper reimbursement, and strict compliance with national neurosurgical coding guidelines.

Clinical Indications

  • Primary malignant supratentorial brain tumors (e.g., glioblastoma multiforme, astrocytoma, oligodendroglioma)
  • Metastatic brain tumors located in the supratentorial compartment (e.g., metastasis from lung, breast, or melanoma)
  • Symptomatic benign supratentorial tumors (excluding meningiomas)
  • Signs of significantly increased intracranial pressure due to a supratentorial mass
  • Focal neurological deficits such as seizures, hemiparesis, aphasia, or visual field cuts correlating to a structurally confirmed supratentorial lesion

Procedure Steps

  1. The patient is placed under general endotracheal anesthesia and appropriately positioned on the operating table.
  2. The patient's head is secured in a rigid skeletal fixation device (e.g., Mayfield clamp).
  3. Preoperative neuroimaging is registered with a frameless stereotactic neuronavigation system to accurately map the supratentorial tumor.
  4. A planned scalp incision is made, and the scalp and muscle flaps are reflected to expose the calvarium.
  5. Burr holes are drilled into the skull, and a high-speed craniotome is used to elevate a customized bone flap (craniotomy), or the bone is removed using rongeurs (craniectomy).
  6. The dura mater is carefully incised and reflected to expose the underlying cortical surface of the brain.
  7. Using a surgical microscope and microsurgical techniques, the surgeon dissects through the cerebral cortex to reach the tumor margin.
  8. The supratentorial brain tumor is progressively excised using a combination of suction, bipolar electrocautery, and an ultrasonic aspirator.
  9. Meticulous hemostasis is achieved within the resection cavity using specialized hemostatic agents and gentle compression.
  10. The dura mater is reapproximated and closed in a watertight fashion, utilizing dural substitutes or sealants if necessary.
  11. The bone flap is replaced and rigidly secured with titanium microplates and screws (if a craniotomy was performed).
  12. The galea and scalp are meticulously closed in multiple anatomical layers, and sterile surgical dressings are applied to the wound.

Coding Guidelines

  • Do not report CPT 61510 in conjunction with codes for the excision of meningiomas (e.g., CPT 61512), as 61510 explicitly excludes meningioma resection.
  • For tumors located in the infratentorial region (below the tentorium cerebelli, such as the cerebellum or brainstem), use the appropriate infratentorial CPT codes (e.g., CPT 61518) rather than 61510.
  • Stereotactic computer-assisted volumetric (navigational) procedures (CPT 61781) may be reported separately if properly documented and if allowed by specific payer policies and NCCI edits.
  • The use of the operating microscope (CPT 69990) may be reported separately, provided the payer's rules and NCCI edits allow it in conjunction with the primary surgical code.
  • If intraoperative mapping of the functional cortex is performed concurrently, mapping codes (e.g., CPT 95961, 95962) may be billed separately depending on the extent of service and clinical documentation.
  • Co-surgery (modifier 62) or assistant surgeon (modifier 80, 81, 82, or AS) may be applicable depending on the complexity of the tumor resection and payer-specific guidelines.

Associated ICD-10 Codes