I took prescribed oxycontin for 2yrs, diagnosed with hypogonadism w/unspecified cause, could this be opioid painkiller induced androgen deficiency?

Definitely: That would be a likely cause for your problem, but other possibilities need to be checked out.

Possibly: Opioid-induced androgen deficiency is a widespread issue in men taking narcotics for chronic pain. It is under recognized since symptoms of low testosterone (fatigue, reduced energy & sex drive) can overlap with chronic pain symptoms. However men must be aware of this possibility, and ask their doctors. For more info: http://www.Healthymerlin.Com/opioid-pain-medication-may-decrease-testosterone.