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Commonly used modifiers when billing for physical, occupational, and speech therapy services. 

Modifier - GP: Services provided under a physical therapy plan of care

Modifier - GO: Services provided under an occupational therapy plan of care

Modifier - GN: Services provided under a speech therapy plan of care

Modifier - KX: Therapists attests that services at and above the therapy caps are medically necessary and justification is documented in the medical record. 

Modifier - CQ: Services performed by a physical therapy assistant

Modifier - CO: Services performed by an occupational therapy assistant

Guide on the use of CQ/CO Modifiers

Modifier - 59 See our NCCI Modifier Guide

Modifier - 22: The physician believes the work required to provide a service is substantially is greater than typically required. Documentation must support this substantial additional work and the reason for it

Modifier - 59: A service or procedure is partially reduced or eliminated at the physician’s discretion

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