Use of the AT modifier for Chiropractic Billing (New Information Along with Information in MM3449)
Published 05/29/2020
The Active Treatment (AT) modifier was developed to clearly define the difference between active treatment and maintenance treatment. Medicare pays only for active/corrective treatment to correct acute or chronic subluxation. Medicare does not pay for maintenance therapy. Claims should include a primary diagnosis of subluxation and a secondary diagnosis that reflects the patient's neuromusculoskeletal condition. The patient's medical record should support the services you are billing.