Wiki Sleep Medicine 95810 or 95811 going into MSLT 95805

[Katwood]

Here's the situation: The patient is already using a prescribed CPAP device and is having an overnight polysomnography before a Multiple Sleep Latency test (95805). This patient completes PSG in our sleep lab using their own CPAP device. The study is attended by a sleep technologist and records the same information as it would if the patient were having a titration study. Wouldn't this test be billed with 95811? Our sleep lab is prior authorizing 95810 because they say the test is to get the patient's "baseline" ahead of the MSLT. I think if the patient is using any type of CPAP device, the correct code is 95811, Polysomnography; age 6 years or older, sleep staging with 4 or more additional parameters of sleep, with initiation of continuous positive airway pressure therapy or bilevel ventilation, attended by a technologist.

Please let me know your thoughts, and if you have any references please include those too. I've been searching, but need a little more help.

Thanks - Kathleen