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G039
G039 – Creatinine
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
Measures creatinine levels in urine. This test is specifically intended to be used to rule out urine tampering, often in conjunction with drugs of abuse screening codes like G040, G041, G042, and G043. Its use is common for patients in opioid agonist maintenance treatment programs or those being managed for chronic pain or addiction.
When to Use
- Use G039 to validate the integrity of a urine sample when performing drug screening for patients in opioid agonist maintenance treatment.
- Apply this code when ordering creatinine testing specifically to rule out sample dilution or tampering during chronic pain management monitoring.
Common Pitfalls
- Billing G039 as a standalone diagnostic test for renal function is inappropriate; it must be linked to the validation of a urine drug screen (G040, G041, G042, or G043).
- Submitting G039 without an accompanying drug screening code for the same date of service will result in a rejection or audit flag for unnecessary testing.
Billing Tips
- Unlike most diagnostic procedures, G039 is explicitly permitted for payment on the same day as counselling services like K013 or K040, so ensure you do not manually exclude it from your daily claims.
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