What is OHIP billing code S166?

S166 is "Small and large intestine terminal ileum, cecum and ascending colon (right hemicolectomy)", an OHIP Urology code from the Ontario Schedule of Benefits (Physician Services).

How much does S166 pay?

The current OHIP fee for S166 is $1029.45, effective 2026-04-01, per the Ontario Schedule of Benefits.

How do I bill S166 to OHIP?

S166 is submitted through OHIP's MCEDT claims system, either directly or via billing software. SnapBill validates S166 claims against the Schedule of Benefits rules before submission.

What codes are related to S166?

Codes related to S166 in the Schedule of Benefits include S160, E793, E714, S162, Z750, S164, S165, S167.

All codes

S166

S166 – Small and large intestine terminal ileum, cecum and ascending colon (right hemicolectomy)

OHIP Urology Code — DIGESTIVE SYSTEM SURGICAL PROCEDURES · Schedule of Benefits

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S166 represents a resection with anastomosis of both the small and large intestine, specifically the terminal ileum, cecum, and ascending colon, a procedure commonly known as a right hemicolectomy. This surgical procedure is eligible for an additional 25% fee increase when performed laparoscopically or with laparoscopic assistance, claimed using the add-on code E793A. It is also eligible for various other premiums, including age-based premiums for pediatric patients, after-hours premiums for non-elective surgeries, and the trauma premium. The service includes 7 base units for anaesthesia (S166C) and 7 base units for a surgical assistant (S166B), with total fees calculated based on the respective unit formulas in the General Preamble ( and ).

When to Use

Use S166 for a standard right hemicolectomy involving the resection of the terminal ileum, cecum, and ascending colon with primary anastomosis.
Select S166 when the procedure is performed laparoscopically; ensure you append E793A to capture the 25% premium for laparoscopic assistance.

Common Pitfalls

Failing to document the Injury Severity Score (ISS) in the patient record when claiming the E420 trauma premium, which will lead to automatic rejection or recovery upon audit.
Attempting to claim E718A for anaesthesia services when the procedure is not a repeat resection, as this code is strictly limited to bowel resections following a previous resection with anastomosis or specific listed codes.

Billing Tips

Always verify that the surgical assistant (S166B) and anaesthesiologist (S166C) claims are submitted with the correct base unit count of 7, as incorrect base units are a frequent cause of claim adjustment.

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Provider Fee$1,029.45

Surgical Assistant Fee$90.37

Anaesthetist Fee$111.72

Non-Anaesthetist Fee$111.72

Effective: April 1, 2026

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