I work in a chiropractor's office. We also provide therapeutic massage, 97124. The pt's insurance (ASHN) authorizes a minimal # of units, far less than the patient needs. She has a secondary insurance. Should we add modifier GA and get her to sign an ABN, so that we can submit the charges to her secondary insurance. Meanwhile, we'll keep submitting requests for additional units to ASHN. Right now, ASHN is stating on the EOB that the charge is the provider's responsibility. With that in place, the secondary won't even consider the claim. We have a non-Medicare specific ABN available for her to sign. If not this modifier, which one should we use? THANKS SO MUCH!!!