Again, it is a hoax. Look at the statement by the American Association of Neurological Surgeons (AANS) and the Congress of Neurological Surgeons (CNS): http://www.aans.org/pdf/AANS_News/Mark_Levin_Statement_FINAL.PDF
The AANS and CNS are unaware of any federal government document directing that advanced neurosurgery for patients over 70 years of age will not be indicated and only supportive care treatment will be provided. Furthermore, in conducting our own due diligence, it appears that the caller who identified himself as a brain surgeon may not actually be a neurosurgeon, nor was there any session at the recent Congress of Neurological Surgeons scientific meeting in Washington, DC at which a purported government document calling for the rationing of neurosurgical care was discussed.
I simply do not believe the explanation, I also heard the live on the air interview.