G377 – Intralesional infiltration - 3 or more lesions
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
This service provides for the intralesional infiltration of 3 or more lesions. As indicated by the '+' symbol in the Schedule of Benefits, this is an add-on procedure and must be billed with an accompanying assessment or visit. Note: Intralesional injection of acne lesions with corticosteroids is not an insured service.
When to Use
- Use G377 when treating 3 or more distinct keloids or hypertrophic scars with intralesional corticosteroids during a single patient encounter.
- Use G377 for the therapeutic infiltration of 3 or more inflammatory lesions such as alopecia areata patches or granuloma annulare when medically necessary.
Common Pitfalls
- Billing G377 for acne treatment will result in automatic rejection or clawback, as intralesional corticosteroid injections for acne are explicitly excluded from OHIP coverage.
- Attempting to bill G377 alongside counselling codes like K013 or K033 will trigger a rejection because G377 is not on the list of permitted exceptions for concurrent billing.
- Billing G377 without an accompanying assessment or visit code (e.g., A007) will cause the claim to fail the add-on procedure validation rule.
Billing Tips
- Ensure the clinical note clearly documents the number of lesions treated to justify the use of G377 over G375, which is intended for fewer than 3 lesions.
- Always pair G377 with an appropriate visit code (e.g., A007) on the same claim to satisfy the add-on requirement.
Effective: April 1, 2026
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Procedure
Diagnostic and Therapeutic Procedures
Intralesional injection of acne lesions with corticosteroids is not an insured service.
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