BALTIMORE (AP) — A Baltimore anesthesiologist who advised people on methods of suicide is appealing his Maryland medical license revocation.

Dr. Lawrence Egbert said Friday he filed the notice for judicial review in Baltimore City Circuit Court. It was filed Thursday, one day shy of the deadline for challenging last month's order by the state Board of Physicians.

The board contends Egbert assisted in the suicides of six patients in Maryland from 2004 to 2008 in violation of professional standards.

Egbert acknowledges he discussed suicide methods with them and was present for at least five of the deaths. But he says his actions didn't constitute the practice of medicine.

All the subjects died by inhaling helium.

The 87-year-old doctor is awaiting trial in Minnesota on charges that he assisted in a suicide there.