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G359

G359Special single agent or multi-agent therapy

OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits

Special single agent or multi-agent therapy – chemotherapy and/or biologic agent(s) with major toxicity that require frequent monitoring and prolonged administration periods and may require immediate intervention by the physician. General Chemotherapy Requirements: This service is for the pharmacologic therapy of malignancy or autoimmune disease, with administration supervised by a physician for intravenous infusion. The physician must be available to intervene in a timely fashion at the initiation and for the duration of the prescribed therapy to manage immediate and delayed toxicities. The fee for chemotherapy and patient assessment provided by a physician includes all patient assessments by any physician for a 24 hour period following treatment administration. [Commentary from Schedule] Examples of special agent therapy include: - high-dose methotrexate with folinic acid rescue - methotrexate given in a dose of greater than 1 g/m2 - high dose cisplatin greater than 75 mg/m2 given concurrently with hydration and osmotic diuresis - high dose cystosine, arabinoside (greater than 2 g/m2) - high dose cyclophosphamide (greater than 1 g/m2) - ifosfamide with MESNA protection - combination of biologic agents with complex chemotherapy.

When to Use

  • Use G359 for high-dose chemotherapy regimens like methotrexate > 1 g/m2 or cisplatin > 75 mg/m2 that require active physician oversight for toxicity management.
  • Use this code for complex multi-agent protocols involving the combination of monoclonal antibodies or cytokines with traditional chemotherapy agents.
  • Select G359 when the clinical protocol necessitates immediate physician availability to manage acute infusion-related toxicities or complex hydration requirements.

Common Pitfalls

  • Billing G359 alongside a standard office visit (A007) or consultation (A005) for the same patient on the same day is a violation of the 24-hour assessment rule.
  • Submitting G359 for biologic agents that are not classified as monoclonal antibodies or cytokines will result in automatic rejection.
  • Attempting to bill separate fees for venipuncture or vascular access line insertion is incorrect, as these are bundled into the G359 fee.

Billing Tips

  • Ensure the infusion protocol explicitly documents the high-dose nature of the chemotherapy to justify the 'special' classification over standard G381 or G345 codes.
  • Remember that the G359 fee covers all physician assessments for the 24-hour period post-administration, preventing additional claims for follow-up checks within that window.
Provider Fee$105.15

Effective: April 1, 2025

Category

J. Diagnostic and Therapeutic Procedures

Subcategory

DIAGNOSTIC AND THERAPEUTIC PROCEDURES

Service Type

Procedure

Code Classes

Diagnostic and Therapeutic Procedures

G381, G345 and G359 are only eligible for payment with respect to the following classes of biologic agents: a. monoclonal antibodies; and b. cytokines.

G381, G345, G359, G075 and G390 include venipuncture, establishment of any vascular access line and administration of agent(s).

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