Question: Texas Subscriber Answer: When your physician indicates "organic sleep apnea," it means he was able to identify a specific cause of the sleep apnea. For example, when the neurologist determines that excessive weight pressing on the patient's ribs and lungs is causing the sleep apnea, you would report 327.23 (Obstructive sleep apnea [adult] [pediatric]). You would report unspecified sleep apnea (780.57) if your neurologist is unable to identify the cause of the apnea or if he is still trying to determine the cause. Except for 780.56 and 780.59, all the 780.5x codes are "unspecified," meaning that you should use them when your physician doesn't give a specific cause for the condition. All the 327.2x codes are "specified" causes of organic sleep apnea, except 327.20 (Organic sleep apnea, unspecified).