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Medicare Changes GA and Adds GX Modifier for Advanced Beneficiary Notices

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Medicare GA and GX Modifiers Changed

Medicare-ModifiersAs of April 1, 2010, Medicare has changed the way you need to report that a Medicare patient signed an Advanced Beneficiary Notice (ABN).  Medicare has revised the GA modifier and added a new GX modifier you must consider when doing medical billing.

Medicare GA Modifier

Prior to April 1st, the GA modifier read “waiver of liability on file.”  The new revised description is “waiver of liability statement issued, as required by payer policy.” Use this modifier when the patient has signed an ABN and you expect Medicare to deny the claim due to the medical necessity of the diagnosis or frequency. By having the signed ABN you will be able to collect from the patient.

Medicare GX Modifier

The new GX modifier reads “notice of liability issued, voluntary under policy.” Use this when you know the service is considered non-covered by Medicare. Because the service is non-covered, you technically do not have to give an ABN to a patient to sign- hence, “voluntary” – but it is a good idea to inform the patient that they are financially responsible.  Plus, you may still want to bill Medicare to get the denial to forward to the secondary payer.

So, are you unsure about when the GX modifier applies? On the Medicare fee schedule, if there is an N or X under the status code, the code is non-covered, and you would append the GX modifier to the CPT code if you had the patient sign an ABN. The Medicare Physician Fee Schedule can be downloaded off the CMS website. Our billing and coding staff likes to use EncoderPro  by Optum, because it is easy to use and gives us a wealth of information.

You are not required to give the patient an ABN for non-covered procedures.  If you do not give the patient an ABN, then you can use the GY modifier to indicate “Item or service statutorily excluded, does not meet the definition of any Medicare benefit, for non-Medicare insurers, is not a contract benefit.”

Please make sure the ABN is filled out properly.  Without a properly competed ABN, it is considered invalid by Medicare, and you will not be able to hold the patient responsible.  We come across this all the time at our medical billing company, and we go back and reeducate the providers, clinical, and front desk staff to make sure they are filled out correctly.

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is a 20 year veteran of healthcare having managed medical practices. He advises medical practices, physicians and practice administrators on how to run their practice and manage their medical billing and revenue cycle management. Manny speaks, blogs and makes videos at, a blog that is tops in the medical billing and coding field. READ MORE

3 Responses to “Medicare Changes GA and Adds GX Modifier for Advanced Beneficiary Notices”

  1. Shilpee Raina says:

    Shall we post a modifier (GA or GX) in case the claim gets denied for preventive check up as a non-covered service?

    • Yes! You will need to use the GA modifier to tell Medicare that there is a valid ABN on file so that if Medicare denies the claim you are able to bill the patient. Without the Advance Beneficiary Notice (ABN) you may not be able to bill the patient.

      With the GX modifier you are telling Medicare that an ABN was obtained for a service that is not covered. This is considered a voluntary ABN because it is really not necessary according to Medicare. You are having the patient sign the ABN just to let them know, as a courtesy, that the service will not be paid by Medicare.

      For specific information about how to use these modifiers contact your local Medicare carrier.

  2. […] When applicable, your Medicare patients should always sign an Advance Beneficiary Notice. An ABN is not used for commercial insurance […]

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The analysis of any medical billing or coding question is dependent on numerous specific facts -- including the factual situations present related to the patients, the practice, the professionals and the medical services and advice. Additionally, laws and regulations and insurance and payer policies (as well as coding itself) are subject to change. The information that has been accurate previously can be particularly dependent on changes in time or circumstances. The information contained in this web site is intended as general information only. It is not intended to serve as medical, health, legal or financial advice or as a substitute for professional advice of a medical coding professional, healthcare consultant, physician or medical professional, legal counsel, accountant or financial advisor. If you have a question about a specific matter, you should contact a professional advisor directly.

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