Modifier GA
Waiver of liability statement issued as required by payer policy (ABN on file)
✅ When to Use Modifier GA
Medicare: when an Advance Beneficiary Notice (ABN) has been signed by the patient for services that may not be covered.
⛔ When NOT to Use Modifier GA
Do NOT use if no ABN was obtained. Use modifier GZ instead (to indicate expected denial without ABN).
📋 Documentation Requirements
Signed ABN on file.
Coding Tips for Modifier GA
Real-world specialist guidance from the PayerReady Medical Coding Team, including audit triggers, denial patterns, and payer policy variations.
ABN on file, expect denial as not medically necessary, patient signed waiver. Required to bill the patient after Medicare denies. Without GA, the provider must write off the denied amount.
Modifier GA FAQ
What does modifier GA mean? +
Waiver of liability statement issued as required by payer policy (ABN on file)
When should I use modifier GA? +
Medicare: when an Advance Beneficiary Notice (ABN) has been signed by the patient for services that may not be covered.
When should I NOT use modifier GA? +
Do NOT use if no ABN was obtained. Use modifier GZ instead (to indicate expected denial without ABN).
What documentation is required for modifier GA? +
Signed ABN on file.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on July 16, 2026.
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