N105 – Carotid circulation - per vessel
OHIP Otolaryngology Code — NEUROLOGICAL SURGICAL PROCEDURES · Schedule of Benefits
This code is for a surgical procedure falling under the Neurological Surgical Procedures section of the OHIP Schedule of Benefits. Payment is subject to the general rules for surgical procedures, including requirements for surgical assistants and anaesthesiologists. See - for details on assistant and anaesthesia fee calculations, and , , and for applicable premiums.
When to Use
- Use N105 for carotid endarterectomy procedures performed on a single vessel.
- Use N105 when performing carotid artery reconstruction or bypass surgery where the procedure is restricted to the carotid circulation.
Common Pitfalls
- Billing N105 bilaterally without appropriate modifier or documentation, as the code is defined 'per vessel' and may trigger audit flags if not clearly specified.
- Failing to append the correct after-hours premium (E410) when the procedure is performed on an emergency basis outside of standard operating hours.
- Attempting to bill N105 in conjunction with other intracranial vascular procedures without ensuring the clinical necessity for both is distinct and documented.
Billing Tips
- Ensure E908 is added if a hematoma is evacuated during the same session as the N105 procedure to maximize the claim value.
- Verify that the surgical assistant and anaesthesiologist claims are submitted with the correct corresponding N105 service date and patient health number to prevent automatic rejection.
Effective: April 1, 2026
X. Neurological Surgical Procedures
NEUROLOGICAL SURGICAL PROCEDURES
Surgical
Musculoskeletal System Surgical Procedures
The medical record must establish that an insured service was provided, the service submitted is the service that was rendered, and the service was medically necessary. See for full details.
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