In modifiers, what does the AT modifier signify?

• A. Administrative treatment
• B. All days treated
• C. Active treatment
• D. Adjusted treatment

Answer: (C)

Active treatment is the meaning behind this modifier. It signals that the session includes purposeful, patient-involved therapeutic actions aimed at improving function, such as exercises, neuromuscular re-education, and manual therapies performed with the patient actively participating. This helps distinguish the visit from passive modalities or maintenance-only care, and it supports medical necessity and appropriate reimbursement by showing that the care is actively addressing the condition. The other phrases don’t align with standard modifier usage, which is specifically about active, not administrative, all-days, or adjusted treatment.