Hi adamsdental!! Thanks for reaching out.
The ICD-10 transition was actually delayed a few months ago for at least one year! So, you will want to continue to use your ICD-9 codes (327.23 for obstructive sleep apnea) until that transition comes!
For more information on the ICD-10 transition delay - follow this link below!
http://dentalwriter.com/forum/default.aspx?g=posts&t=296