Specialty Billing Built for Neurosurgery Practices

Posterior spinal instrumentation codes 22840-22844 are reported based on the number of vertebral levels spanned by the instrumentation construct: 22840 for 1-2 levels, 22841 for 3-4 levels (note: 22842 in some edits), 22842-22844 for increasing level counts. One instrumentation code is billed per construct, not per level, and the code is selected by the total number of instrumented levels. Anterior instrumentation (22853-22857) is billed separately when performed. We count the instrumented levels from the operative note and select the correct tier, because billing the wrong tier — or failing to bill instrumentation at all — drops the per-construct add-on value on every instrumented fusion.

Interbody devices and cages are billed with code 22851, reported for each interbody device placed at each level — it is a per-level add-on on top of the fusion. Bone grafts are billed separately based on the graft type: 20936 for morselized autograft, 20937 for structural allograft, and 20938 for structural autograft, each an add-on. When an interbody device and a bone graft are both used, both are billed with their supporting documentation in the operative note. We capture interbody devices and grafts at the case level so these add-ons are never silently dropped from multi-level fusion cases.

Craniotomy for tumor (61510) and other cranial procedures carry post-operative global periods during which routine follow-up visits are bundled into the surgical payment. A staged or planned related procedure in the global uses modifier 58, an unplanned return to the OR uses modifier 78, and an unrelated E/M visit in the global uses modifier 24. For post-op tumor surveillance and return-to-OR cases, the timing and indication determine whether the visit is bundled or separately billable. We track every craniotomy global period so follow-up and return procedures are billed with the correct modifier rather than denied as included in the global package.

Modifier 80 (assistant surgeon) or 82 (assistant surgeon when no qualified resident is available) is appended when an assistant surgeon provides assistance during a complex neurosurgical procedure and the procedure's assistant-surgeon indicator allows it. Complex spine fusions, multi-level decompressions, and many craniotomies qualify for assistant-surgeon billing. Some payers require prior authorization or have specific documentation requirements for assistant participation. We apply modifier 80/82 on qualifying complex cases with the supporting documentation, because complex neurosurgery performed with an assistant but billed without the assistant modifier loses the assistant-surgeon payment on high-RVU cases.

Deep-brain stimulation (DBS) and shunt procedures are billed with the procedure code plus the implant device and component codes captured at the case level, along with prior authorization for most commercial payers. For DBS this includes the neurostimulator and lead codes; for shunts the valve and catheter components. Under-billing happens when the device and component codes are not captured separately from the procedure, or when the device cost isn't documented in the operative record. We capture the procedure, the implant devices, and any additional components for every DBS and shunt case, with prior authorization obtained in advance, so the full procedure revenue — including the devices — is recovered.