Z492 – Follow up of normal colonoscopy
OHIP Psychiatric Code — DIGESTIVE SYSTEM SURGICAL PROCEDURES · Schedule of Benefits
This service covers a follow-up colonoscopy to the sigmoid or descending colon. It is specifically for a patient who remains asymptomatic five years following a previous normal screening colonoscopy billed under Z499. A colonoscopy is defined as 'normal' if it showed either no polyps or only small (<1 cm) hyperplastic polyps present. This service is uninsured if performed within the five-year period after the qualifying Z499. See related codes for other follow-up scenarios: - Z493: 10-year follow-up of normal colonoscopy. - Z491: Follow-up for incomplete polyp removal. - Z494: Follow-up for hyperplastic polyposis syndrome.
When to Use
- Use Z492 for a surveillance colonoscopy performed exactly five years after a previous colonoscopy coded as Z499, provided the patient remains asymptomatic.
- Use Z492 when the previous colonoscopy (Z499) findings were limited to no polyps or only small hyperplastic polyps (<1 cm).
Common Pitfalls
- Billing Z492 within the five-year window following a Z499 will result in a rejection, as the service is considered uninsured during that interval.
- Misidentifying the previous findings; if the prior colonoscopy involved adenomatous polyps or polyps >= 1 cm, Z492 is inappropriate and a different diagnostic or surveillance code must be used.
- Failing to distinguish between Z492 (5-year follow-up) and Z493 (10-year follow-up), which leads to automatic claim rejections based on the patient's history.
Billing Tips
- Ensure the anaesthesia component is billed as E032C, which provides 4 basic units plus time, overriding the standard 5 basic units listed in the Schedule of Benefits.
- Verify the patient's prior colonoscopy history in the provincial database to confirm the exact date of the qualifying Z499 to avoid the five-year uninsured penalty.
Effective: April 1, 2025
S. Digestive System Surgical Procedures
DIGESTIVE SYSTEM SURGICAL PROCEDURES
Surgical
Digestive System Surgical Procedures
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