N511 – One level - unilateral
OHIP Otolaryngology Code — SPINAL SURGICAL PROCEDURES · Schedule of Benefits
One level - unilateral (Lumbar). Includes hemi and total laminectomy, foraminotomy and facetectomy.
When to Use
- Use N511 for a unilateral lumbar decompression involving a single vertebral level, such as a unilateral foraminotomy or hemi-laminectomy for spinal stenosis.
- Select N511 when performing a unilateral facetectomy at one lumbar level, as this procedure is explicitly included in the code definition.
Common Pitfalls
- Billing N511 alongside N512 (bilateral) for the same level is a common rejection; N511 is strictly for unilateral procedures.
- Failing to append E361 when performing decompression at a second lumbar level results in significant under-billing, as N511 only covers the primary level.
- Attempting to bill N511 for a discectomy alone without the required decompression components (laminectomy/foraminotomy) may lead to audit scrutiny regarding the appropriateness of the code selection.
Billing Tips
- Always pair N511 with E368 if a disc excision is performed during the same unilateral decompression procedure to maximize the claim value.
- Ensure the operative report explicitly details the unilateral nature of the decompression to support the use of N511 over the higher-valued N512.
Effective: April 1, 2025
Z. Spinal Surgical Procedures
SPINAL SURGICAL PROCEDURES
Surgical
Musculoskeletal System Surgical Procedures
An appropriate operative or consultation report must be submitted for Independent Consideration (IC) claims, comparing the scope and difficulty to non-IC procedures.
For services based on time or units, the start and end times must be recorded in the patient's medical record.
All insured services must be documented in medical records to establish that the service was provided, medically necessary, and matches the submitted claim.
For second assistant services, a letter from the surgeon outlining the reason is required for authorization unless the service is on the pre-approved list.
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