S402 – Drainage of Perinephric Abscess
OHIP Urology Code — Kidney and Upper Urinary Tract · Schedule of Benefits
S402 is a surgical procedure for the drainage of a perinephric abscess. It is listed in the Schedule of Benefits under Urogenital and Urinary Surgical Procedures. The fee for this service depends on the role of the physician: surgeon (suffix A), assistant (suffix B), or anaesthesiologist (suffix C). The assistant fee is calculated based on 7 basic units plus time units. The anaesthesia fee is calculated based on 7 basic units plus time units. See - and - for details on unit calculations.
When to Use
- Use S402 for the surgical drainage of a confirmed perinephric abscess, typically performed via open incision or percutaneous approach.
- Select S402 when the procedure is specifically focused on the perinephric space, distinguishing it from general nephrostomy or simple renal cyst drainage.
Common Pitfalls
- Billing S402 alongside other renal procedures without ensuring the 'major procedure' rule is applied for assistant and anaesthesia unit calculations, which can lead to payment adjustments.
- Attempting to bill for a second assistant without prior authorization from a medical consultant, as S402 is not on the pre-approved list for second assistant coverage.
- Failing to document the Injury Severity Score (ISS) when attempting to claim the E420 trauma premium, which is a common cause for claim rejection.
Billing Tips
- Ensure the procedure start time is accurately recorded to correctly trigger after-hours premiums (E409/E410) or assistant/anaesthesia after-hours premiums (E400/E401 series).
Effective: April 1, 2025
Urogenital and Urinary Surgical Procedures
Kidney and Upper Urinary Tract
Surgical
Urogenital and Urinary Surgical Procedures
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