Multiple Sleep Latency Testing

Multiple Sleep Latency Testing (MSLT) is covered for evaluation of suspected narcolepsy and idiopathic hypersomnia in patients aged ≥2 years with excessive daytime sleepiness (≥8 weeks) and an Epworth Sleepiness Scale ≥10, with pediatric considerations (onset as early as 2 years; for patients <11 years the test must be ordered by a pediatric neurologist/pulmonologist/sleep specialist and performed in a pediatric sleep–specialized facility). Major limitations/requirements: a standard polysomnogram must be planned the night before, MSLT is not indicated for other sleep disorders or for patients <2 years, it is excluded if the prior-night PSG shows significant sleep pathology, and repeat MSLT is covered only when prerequisites are met and the initial study was invalid, uninterpretable, or affected by extraneous circumstances.

"MSLT when performed as part of the routine evaluation for suspected narcolepsy."