Modifier GA- Waiver of Liability Statement on File

Modifier GA is used when a provider has a signed waiver of liability statement on file for a service expected to be denied by Medicare.

What is Modifier GA?

Modifier GA tells Medicare that the patient received an Advance Beneficiary Notice (ABN) before the service was performed.

When to Use Modifier GA

• A service is expected to be denied by Medicare
• An ABN has been properly completed
• The patient agrees to financial responsibility
• Medicare coverage is uncertain

Billing Example

A provider performs a service that may not meet Medicare medical necessity requirements. The patient signs an ABN before treatment, and Modifier GA is appended to the claim.

Documentation Tips

• Keep the signed ABN on file
• Clearly document medical necessity concerns
• Ensure patient acknowledgment is completed
• Use the modifier only when an ABN exists

Common Denial Reasons

• Missing ABN documentation
• Incorrect modifier usage
• ABN completed improperly
• Service does not qualify for Modifier GA

Related Modifiers

Modifier GX

Modifier 25

Modifier 59