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E991
E991 – Flow-diverter or intra-saccular device deployment
OHIP Surgical Assists Code · Schedule of Benefits
When to Use
- Use E991 when deploying a flow-diverter stent (e.g., Pipeline) for intracranial aneurysm reconstruction in conjunction with N122 or N125.
- Use E991 when placing an intra-saccular flow disruption device (e.g., WEB device) as the primary treatment strategy for an intracranial aneurysm.
- Apply this code when the clinical procedure requires the specific technical complexity of flow diversion or intra-saccular remodeling that exceeds standard coiling or stent-assisted coiling.
Common Pitfalls
- Billing E991 alongside coil embolization or stent-assisted coiling will result in a rejection, as it is restricted to specific flow-diverting or intra-saccular technologies.
- Attempting to bill E991 multiple times for multiple devices or multiple vessels in a single session will lead to payment recovery, as it is strictly a single-unit add-on.
- Submitting E991 without an N122 or N125 base code will cause an automatic rejection, as it is defined exclusively as an add-on to these specific intracranial endovascular management codes.
Billing Tips
- Ensure the operative report explicitly names the device (e.g., WEB, Artisse, Pipeline) to satisfy audit requirements for the add-on fee.
- If the procedure is non-elective and performed after hours, apply the E409 or E410 premium to the total procedural fee, including the E991 add-on, to maximize the claim value.
Provider Fee$700.00
Effective: April 1, 2026
Service Type
Add-on
Code Classes
Surgery
Operative report must document the use of flow-diverter or intra-saccular devices (e.g., WEB, Artisse)
E991 is not payable per vessel or per device even if multiple devices are used in the same category.
Intra-saccular devices refer to endovascular implants designed to be deployed within the aneurysm sac (e.g., WEB, Artisse).
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