I found the code 327.8 is what I use for upper airway resistance syndrome.
At the hospital I work at we use an encoder product called Quantim by Quadramed. * no endorsement intended * . Quantim gives me a code of 327.8 Other Organic Sleep Disorders.
Upper airways resistance syndrome is one of type of sleep apnea. 2009 ICD-9-CM diagnosis 780.57
Upper airway resistance syndrome is in the spectrum of obstructive sleep apnea so I use 327.23. That is the code that all of our providers use.