What is the u1 modifier used for?

What is the u1 modifier used for? Trip number modifiers U1, U2, U3, U4, U5, and U6 are used to identify procedure codes related to the same trip for the same member by the same provider on the same DOS (date of service) . What is a U1 modifier? (Modifier SA is used when the … Continue reading What is the u1 modifier used for?