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When to use GZ Modifier? The GZ modification is included in claims where the product or service is likely to be rejected because it is inappropriate or needed, and there is an absence of a correctly implemented ABN # within the claim file. For more information about GZ Modifier, Get in touch with us: https://medmaxtechnologies.com/contact-us/ Email us: info@medmaxtechnologies.com or Call us: +1-586-436-3761.