We are an outpatient rehabilitation facility located in Michigan. When we bill for a Worker's Comp claim, are we supposed to use a 1500 or UB04 claim form? We get conflicting answers from the insurance companies. What happens is if we bill on a UB04 (facility), the insurance company doesn't want to pay us the statutory rate for "Physical Medicine" because they assume we are a hospital. If we bill on a 1500 (physician) they want the NPI number of the therapist which the therapist doesn't have because the facility does all of the billing. Any light you can shed on this would be appreciated.