My question relates to the answer to last week’s question about assigning modifier 52 to the code for an incomplete polysomnography (PSG) with CPAP titration. To use this modifier, is there a time requirement for the CPAP?


The average sleep study is expected to exceed six hours. If the total time for the sleep study (prior to and with CPAP) is more than six hours, modifier 52 is not indicated. If CPAP is applied at four hours and the patient becomes agitated or is unwilling to complete the study and the study is ended before six hours of recording time is achieved then the 52 modifier is to be appended.


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