What is OHIP billing code Z596?

Z596 is "Extracorporeal shock wave lithotripsy for bile duct calculi", an OHIP Psychiatric code from the Ontario Schedule of Benefits (Physician Services).

How much does Z596 pay?

The current OHIP fee for Z596 is $314.20, effective 2025-04-01, per the Ontario Schedule of Benefits.

How do I bill Z596 to OHIP?

Z596 is submitted through OHIP's MCEDT claims system, either directly or via billing software. SnapBill validates Z596 claims against the Schedule of Benefits rules before submission.

All codes

Z596

Z596 – Extracorporeal shock wave lithotripsy for bile duct calculi

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

Ask AI Bill This Code — Sign Up Free

Extracorporeal shock wave lithotripsy for bile duct calculi is a surgical procedure for managing stones in the biliary system. This technique involves using high-energy shock waves generated outside the body, which are then focused on the bile duct calculi to fragment them into smaller pieces. These smaller fragments are then able to pass through the duct system more easily. This service is eligible for payment to the surgeon (suffix A) and the anaesthesiologist (suffix C), with the anaesthesia component having 6 base units.

When to Use

Use Z596 for the primary procedure of extracorporeal shock wave lithotripsy specifically targeting bile duct calculi.
Use this code when the clinical intent is the non-invasive fragmentation of biliary stones to facilitate their passage.

Common Pitfalls

Do not bill Z596 for lithotripsy of renal or ureteral calculi, which require different procedural codes.
Avoid billing Z596 in conjunction with other biliary surgical procedures unless a distinct and separate incision or approach is documented, as this may trigger a claim rejection for unbundling.
Failure to document the specific location of the calculi in the bile duct can lead to audit scrutiny regarding the medical necessity of the extracorporeal approach.

Billing Tips

Ensure the anaesthesiologist correctly applies the 6 base units and adds any applicable patient-specific modifiers (e.g., ASA status or age premiums) to the anaesthesia claim.
When performing this procedure after hours, ensure the claim includes the appropriate E-series premium code (E409 or E410) to receive the correct percentage increase on the procedural fee.

Have a specific question? Ask our billing assistant

Provider Fee$314.20

Anaesthetist Fee$92.94

Non-Anaesthetist Fee$92.94

Effective: April 1, 2025

Ready to bill this code?

SnapBill makes OHIP billing simple — auto-filled codes, validation, and batch submission.

Get Started Free Already have an account? Sign in