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G429
G429 – Radioactive phosphorus examination - anterior approach
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
Radioactive phosphorus examination, anterior approach.
When to Use
- Use G429 when performing a diagnostic radioactive phosphorus uptake test specifically targeting anterior ocular or superficial structures.
- Select G429 over G430 when the examination is limited to the anterior approach rather than the posterior approach.
Common Pitfalls
- Billing G429 in conjunction with G421 is often flagged for audit if the clinical documentation does not clearly delineate separate diagnostic intent for each procedure.
- Failing to manually apply the 50% bilateral modifier when performing the examination on both eyes results in underpayment, as the system does not always auto-calculate this adjustment.
Billing Tips
- Ensure the claim includes the appropriate diagnostic code for the underlying pathology to justify the radioactive tracer usage, as G429 is strictly a procedural fee.
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