N155 – Cerebral vascular malformation - infratentorial
OHIP Otolaryngology Code — NEUROLOGICAL SURGICAL PROCEDURES · Schedule of Benefits
Surgical procedure for cerebral vascular malformation, specifically infratentorial, performed via craniotomy. This code is listed under X. Neurological Surgical Procedures in the Schedule of Benefits.
When to Use
- Use N155 for the surgical excision of an infratentorial cerebral vascular malformation via craniotomy, distinguishing it from supratentorial procedures which fall under N106.
- Apply this code when the vascular malformation is located in the posterior fossa, including the cerebellum or brainstem, requiring a suboccipital or similar infratentorial approach.
Common Pitfalls
- Failure to append the mandatory E901 add-on code when an operating microscope is utilized, which is standard for these microsurgical resections.
- Neglecting to add the E895 premium when the documented size of the arteriovenous malformation exceeds 4 cm, as this is a specific requirement for N155.
- Confusing N155 with N106; ensure the operative report clearly specifies an infratentorial location to avoid rejection or audit recovery.
Billing Tips
- Always verify the size of the malformation in the operative report to support the inclusion of E895, and ensure the use of an operating microscope is explicitly stated to justify E901.
Effective: April 1, 2026
X. Neurological Surgical Procedures
NEUROLOGICAL SURGICAL PROCEDURES
Surgical
Musculoskeletal System Surgical Procedures
All insured services must be documented in appropriate records to establish that an insured service was provided, the service for which the account is submitted is the service that was rendered, and the service was medically necessary.
An operative report is typically required for surgical procedures.
This code is specifically listed on page under 'Cerebral vascular malformation - Craniotomy'.
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