This CPB is revised to state that a sleep testing device measuring three or more channels that include actigraphy, oximetry, and peripheral arterial tone (Watch-PAT) is considered medically necessary for diagnosing obstructive sleep apnea when criteria are met. This policy revision is supported by the conclusions of a decision memorandum from the Centers for Medicare & Medicaid Services and by an assessment from the California Technology Assessment Forum. This CPB is revised to remove the requirement for a 12-week trial of CPAP before purchase.