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G413
G413 – Electrocorticogram - supervision and interpretation
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
Provides for the physician's supervision and interpretation of an electrocorticogram (ECoG), a procedure that involves placing electrodes directly on the exposed surface of the brain to record electrical activity.
When to Use
- Use G413 when performing the technical supervision and formal interpretation of intraoperative electrocorticography during neurosurgical procedures to localize epileptogenic zones.
- Use this code specifically for the professional component of the ECoG study when the recording is performed directly on the cortical surface, distinct from standard scalp EEG (G267).
Common Pitfalls
- Billing G413 on the same day as G267 will result in a rejection or zero payment for G413, as the Ministry considers these mutually exclusive for the same patient encounter.
- Failing to document the specific duration and findings of the electrocorticogram interpretation in the operative report creates a significant audit risk for this high-value diagnostic code.
Billing Tips
- Ensure the operative note explicitly distinguishes the ECoG interpretation from standard intraoperative monitoring to justify the G413 claim over other general neuro-diagnostic codes.
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