X405 – Complex head - with IV contrast
OHIP Laboratory Code — DIAGNOSTIC RADIOLOGY · Schedule of Benefits
Complex Computed Tomography (CT) of the head performed with the administration of intravenous (IV) contrast. The definition and criteria for what constitutes a 'Complex head' study are specified in paragraph 9 of the Diagnostic Radiology Preamble. This service represents both the technical performance and the professional interpretation of the scan.
When to Use
- Use X405 for CT head studies requiring contrast for complex pathology such as intracranial vascular malformations, suspected neoplasms, or infectious processes that meet the specific complexity criteria defined in paragraph 9 of the Diagnostic Radiology Preamble.
- Select X405 over X401 when the clinical indication necessitates contrast enhancement to differentiate between vascular and non-vascular structures or to evaluate blood-brain barrier integrity.
Common Pitfalls
- Billing X405 in conjunction with E874 is prohibited; the Preamble explicitly excludes claiming a contrast-enhanced CT head service when a perfusion study is performed.
- Failure to document the Injury Severity Score (ISS) in the medical record when claiming the E420 trauma premium will result in a clawback during audit.
- Misclassifying a standard contrast head CT as 'complex' when it does not meet the specific technical or diagnostic criteria outlined in paragraph 9 of the Diagnostic Radiology Preamble.
Billing Tips
- Ensure the referral source and clinical indication are clearly linked to the complexity criteria, as the MOH requires documentation to support the 'complex' designation over standard CT head codes.
- When interpreting urgently via PACS, ensure the transmission time to the referring provider is logged to satisfy the three-hour requirement for E406, E407, or E408 eligibility.
Effective: April 1, 2025
D. Diagnostic Radiology
DIAGNOSTIC RADIOLOGY
Diagnostic
Diagnostic Radiology
Refer to the Diagnostic Radiology Preamble, paragraph 9, for the specific definition and criteria for a 'Complex head' study.
The physician submitting a claim for the technical component is responsible for the complete quality assurance process for all elements of the technical component of the service, including data acquisition, reporting, and record keeping. The physician must be able to demonstrate the above upon request by the MOH.
Complex head (see Diagnostic Radiology Preamble, paragraph 9).
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