Z498 – Follow up of abnormal colonoscopy - sigmoid to descending colon
OHIP Psychiatric Code — DIGESTIVE SYSTEM SURGICAL PROCEDURES · Schedule of Benefits
This procedure is a colonoscopy extending to the sigmoid to descending colon, performed as a follow-up investigation. It is indicated for patients with a history of colorectal malignancy or for the surveillance of adenomatous polyps based on specific criteria related to their number, size, and histology. As a surgical procedure, it includes all common and constituent elements of insured services as outlined in the Schedule of Benefits.
When to Use
- Use Z498 for surveillance colonoscopies specifically limited to the sigmoid to descending colon in patients with a history of colorectal malignancy.
- Use Z498 for follow-up of adenomatous polyps when the surveillance interval is determined by the number, size, and histology of previously removed polyps as defined in the Schedule of Benefits.
Common Pitfalls
- Billing Z498 in conjunction with any other code from the Z491-Z499 or Z555 series on the same day will result in an automatic rejection.
- Attempting to bill an assistant fee (suffix B) for this procedure will be rejected, as the Schedule of Benefits explicitly states assistant services are not eligible for payment with this code.
- Using Z498 for diagnostic colonoscopies (e.g., investigation of symptoms like bleeding or anemia) rather than established surveillance protocols is an audit risk.
Billing Tips
- Ensure the anaesthesia service is billed using E032C, which provides 4 basic units specifically for this procedure, rather than standard anaesthesia codes.
- Always document the specific surveillance criteria (e.g., polyp size, number, and histology) in the patient record to justify the use of the follow-up code over a diagnostic code.
Effective: April 1, 2025
S. Digestive System Surgical Procedures
DIGESTIVE SYSTEM SURGICAL PROCEDURES
Surgical
Digestive System Surgical Procedures
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