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G198
G198 – Patch test for industrial or occupational dermatoses
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
A patch test for industrial or occupational dermatoses. This service is limited to a maximum of 125 per patient, per year per test.
When to Use
- Use G198 when performing individual patch tests specifically to identify contact allergens related to a patient's workplace environment.
- Apply this code for each individual allergen patch applied, up to the annual limit of 125, when investigating suspected occupational contact dermatitis.
Common Pitfalls
- Billing G198 for standard allergy testing or non-occupational dermatoses will trigger audit flags as the code is strictly limited to industrial or occupational indications.
- Submitting claims exceeding the 125-test annual limit per patient will result in automatic rejections, as this is a hard cap defined in the Schedule of Benefits.
Billing Tips
- Ensure your clinical notes clearly link the specific allergens tested to the patient's occupational history to justify the use of G198 over other diagnostic procedures.
- If performing a comprehensive series, ensure you are billing the quantity of patches applied (up to 125) rather than a single flat fee for the session.
Provider Fee$2.39
Effective: April 1, 2025
Category
J. Diagnostic and Therapeutic Procedures
Subcategory
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Service Type
Procedure
Code Classes
Diagnostic and Therapeutic Procedures
As per , all insured services must be documented in appropriate records to establish that: 1. an insured service was provided; 2. the service for which the account is submitted is the service that was rendered; and 3. the service was medically necessary.
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