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Modifier CO

Therapy discipline & assistants

Modifier CO. Service furnished in whole or part by an occupational therapy assistant (OTA) — 85% payment alongside GO.

Reference only — CPT descriptors are AMA-copyrighted (paraphrased). Payment percentages and acceptance vary by payer; verify against the current CPT/HCPCS files and payer policy.

Related modifiers

GP
Services delivered under a physical therapy plan of care.
GO
Services delivered under an occupational therapy plan of care.
GN
Services delivered under a speech-language pathology plan of care. (Only one dis…
CQ
Service furnished in whole or part by a physical therapist assistant (PTA) — tri…
KX
Requirements specified in the medical policy have been met — for therapy, attest…

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