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Z590
Z590 – Paracentesis - for diagnostic sample
OHIP Psychiatric Code — DIGESTIVE SYSTEM SURGICAL PROCEDURES · Schedule of Benefits
Paracentesis - aspiration for diagnostic sample. This is a surgical procedure listed under the Digestive System section of the Schedule. It involves the aspiration of fluid from the peritoneal cavity for diagnostic analysis. The service includes all common elements of insured services as outlined in the General Preamble (, ). An additional fee (E542) is applicable when this procedure is performed in a setting outside of a hospital.
When to Use
- Use Z590 when the primary clinical objective is the aspiration of peritoneal fluid strictly for diagnostic laboratory analysis.
- Use Z590 for a diagnostic tap where no significant volume of fluid is removed for symptomatic relief, distinguishing it from the therapeutic drainage covered by Z591.
Common Pitfalls
- Billing Z590 in conjunction with a consultation or assessment code on the same day often triggers rejections unless the procedure is clearly distinct and medically necessary as a separate service.
- Attempting to bill Z590 and Z591 on the same patient on the same day is generally disallowed, as the procedure is considered a single encounter regardless of the volume aspirated.
- Failing to append E542 when the procedure is performed in a clinic or office setting results in lost revenue, as Z590 is base-priced for hospital environments.
Billing Tips
- Always verify the setting of the procedure to ensure E542 is included for non-hospital claims, as this add-on is not automatically triggered by the location code.
- If the procedure is performed after hours or in an emergency department, ensure you apply the appropriate Special Visit Premium (Table I, II, or III) instead of relying on the base fee alone.
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