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N550
N550 – Sequestrectomy, posterior approach
OHIP Otolaryngology Code — SPINAL SURGICAL PROCEDURES · Schedule of Benefits
This surgical procedure is for the removal of a sequestrum (a piece of dead bone tissue) from the spine, performed through a posterior approach, typically in cases of spinal osteomyelitis. The service includes incision and drainage; therefore, N548 is not eligible for payment when rendered with N550.
When to Use
- Use N550 when performing a formal posterior sequestrectomy for spinal osteomyelitis where the primary objective is the removal of necrotic bone.
- Use this code for posterior spinal debridement procedures that involve the specific extraction of a sequestrum, as it is more specific than general debridement codes.
Common Pitfalls
- Do not bill N548 (Incision and drainage) alongside N550, as the Ministry considers the drainage component bundled into the N550 fee.
- Avoid using N550 for simple superficial wound debridement; it is intended for deep spinal procedures involving bone sequestration.
Billing Tips
- Ensure the operative report explicitly documents the removal of a 'sequestrum' to justify the use of N550 over standard debridement or drainage codes.
- If the procedure is performed on a pediatric patient, verify the age-based premium eligibility to increase the base fee by 10% to 30% depending on the exact age.
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