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My educated guess is that it is used without a hyphen when used as a verb, and with a hyphen when used as an adjective.

Dr. Smith is on call. He is the on-call physician.

Similar to follow up:

Dr. Smith will follow up with the patient when she has her follow-up visit.

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Rickey Marvin

Lvl 10
3y ago

What else can I help you with?