Modifier AT (active treatment) defines the difference between active treatment and maintenance treatment.

The AT modifier is required under Medicare billing to receive reimbursement for CPT codes 98940 - 98942. For Medicare purposes, the AT modifier is used only when chiropractors bill for active or corrective treatment (acute and chronic care).

Every chiropractic claim for 98940, 98941 and 98942, should include the AT modifier if active or corrective treatment is being performed. Claims that do not contain modifier AT will deny.

When your office receives a request for medical records to substantiate the chiropractic services you rendered and billed to Medicare, our nurse reviewers review the documentation and verify all the required documentation has been met. If you met the documentation requirements, the nurse reviewers will send the documentation to a chiropractic consultant to determine the medical necessity of the services. If you did not meet the documentation requirements, the nurse reviewers will deny the services based on the lack of documentation.

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