Z499 – Colonoscopy for risk evaluation - sigmoid to descending colon
OHIP Psychiatric Code — DIGESTIVE SYSTEM SURGICAL PROCEDURES · Schedule of Benefits
This procedure is a sigmoidoscopy to the descending colon for a patient who shows no signs or symptoms but has a family history suggesting an increased risk of malignancy. This includes having a first-degree relative or at least two second-degree relatives with colorectal cancer or a premalignant lesion. Per , anaesthesia for this service is payable as E032C, which provides 4 basic units plus time units, overriding the 5 units listed for this procedure in the surgical section.
When to Use
- Use for asymptomatic patients undergoing surveillance due to a first-degree relative with colorectal cancer or premalignant lesions.
- Use for asymptomatic patients with a family history of two or more second-degree relatives with colorectal cancer or premalignant lesions.
- Use specifically when the procedure is limited to the sigmoid and descending colon, distinguishing it from full colonoscopy codes like Z492.
Common Pitfalls
- Billing Z499 for symptomatic patients; this code is strictly for risk evaluation in asymptomatic individuals, whereas symptomatic patients require diagnostic codes.
- Failing to meet the age criteria; Z499 is only payable if the patient is 40+ or 10 years younger than the youngest affected relative, and claims will be rejected if this is not documented.
- Incorrectly billing anaesthesia units; you must use E032C (4 basic units plus time) instead of the standard 5 units listed in the surgical section.
Billing Tips
- Ensure the medical record explicitly states the family history and the age of the youngest affected relative to justify the timing of the procedure.
- Always verify that the procedure did not extend beyond the descending colon, as exceeding this anatomical limit may necessitate a different code.
Effective: April 1, 2025
S. Digestive System Surgical Procedures
DIGESTIVE SYSTEM SURGICAL PROCEDURES
Surgical
Digestive System Surgical Procedures
Documentation of the patient's family history that meets the criteria for increased risk of malignancy.
Patient is 40 years of age or older.; or Patient is 10 years younger than the earliest age of diagnosis of the youngest affected relative. This age is dependent on family history and cannot be predetermined.
Z499 is only insured for a patient 40 years of age or older or 10 years younger than the earliest age of diagnosis of the youngest affected relative.
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