What are the Q0/Q1 modifiers?The Q0/Q1 HCPCS modifiers are used to characterize the line-item service as investigational or a routine cost in a Qualified Clinical Trial when billing for items/services related to a Qualified Clinical Trial or approved study regardless of whether all services on the claim are related to the clinical trial or not. Billing Medicare, Medi-Cal and most private payers for outpatient items/services that are routine costs of a Qualified Clinical Trial, approved device study, or other study/registry approved under CED requires line-item application of HCPCS modifier Q0 for investigational item/services, and line-item application of HCPCS modifier Q1 for routine services. | |
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