LT (Left) and RT (Right) Modifiers

A medical biller will use these modifiers to identify when a procedure was performed on both the Left and Right side of the body.

When billing insurance carriers you will run into times where the provider treated both sides of the body and will indicate the procedure two times. If you bill your insurance carrier without the proper modifiers one of the line items will be denied as a duplicate.

In this case you will attach the RT modifier to one of the procedure codes and the LT modifier to the other procedure code.

An Example of when to use Left and Right modifiers:
A patient is referred to an imaging center for carpal tunnel on both wrists. The technician indicates they performed procedure code 73100 LT and a 73100 RT.

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