Billing code
E844A — Bilateral ethmoidectomy/antrostomy add-on
Bilateral ethmoidectomy add-on
Add to M083 when the endoscopic ethmoidectomy, with or without antrostomy, is done on both sides.
Watch for: Payable only with a paid M083 on the same claim.
| Provider | Specialist | Assistant | Anaesthetist | Non-anaesthetist |
|---|---|---|---|---|
| $200.00 | $0.00 | $0.00 | $0.00 | $0.00 |
- Code
- E844A
- Description
- Bilateral ethmoidectomy/antrostomy add-on
- FHO+ basket
- Not in the FHO+ base rate basket (Schedule 2 or 2B).
- Effective date
- Apr 1, 2025
- Termination date
- No end date
Explanation
Updated October 26, 2026
Add-on to M083 when the endoscopic ethmoidectomy (with or without antrostomy) is done on both sides.
What it covers
E844 is the bilateral procedure add-on to M083, intranasal endoscopic ethmoidectomy that may include maxillary antrostomy (P6).
Billing rules
- Payable only with M083 (P6).
- M083's rules apply: not with M054 or M061, and with M050/M052 only when ethmoidectomy treats ethmoid disease (P6).
Often billed with
- M083 endoscopic ethmoidectomy (P6).
Common rejections
- ADF: OHIP describes this as 'Corresponding procedure invalid, omitted or paid at zero': the add-on was billed without a paid M083 on the same claim.
Related codes: M083, E865, E843, E845
Source: Schedule of Benefits (July 1, 2026), Respiratory Surgical Procedures, Accessory Nasal Sinuses, page P6.
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