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E946
E946 – Mastoid cavity obliteration
OHIP Surgical Assists Code — AURAL SURGICAL PROCEDURES · Schedule of Benefits
When to Use
- Use E946 when performing obliteration of the mastoid cavity using autologous tissue, bone chips, or synthetic materials during a primary or revision mastoidectomy.
- Claim E946 in conjunction with E322 when the mastoid cavity is obliterated to prevent chronic drainage or to facilitate a canal-wall-up conversion.
Common Pitfalls
- Submitting E946 as a standalone code without an associated primary mastoidectomy code (E315, E320, or E322) will result in an automatic rejection.
- Billing E946 for simple closure or standard wound management that does not involve formal obliteration of the mastoid cavity is considered an inappropriate use of the code.
Billing Tips
- Ensure the primary mastoidectomy code (E315, E320, or E322) is listed first on the claim to ensure the add-on logic triggers correctly for the E946 fee.
- If the procedure is performed after hours or on a pediatric patient, apply the relevant premiums to the total procedural fee, including the E946 component.
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