Joyce Olive Rogerson died in October 2010 at Wedgewood Manor in Summerside.
She was 83.
In a statement, the coroner's office says the inquest will be held on March 26 and 27 in Summerside.
The office did not explain why it decided to launch an inquest, and Dr. Charles Trainor, the chief coroner, did not return a message seeking comment.
Health PEI, which is responsible for delivering publicly funded health services in the province, said it would participate fully in the process.
"Our staff and physicians are committed to providing safe, high-quality health care," the provincial Crown corporation said in a statement.
"We anticipate that this inquest will support us in this commitment. As this matter is now the subject of a legal proceeding, no further information can be shared."
Wedgewood Manor is a long-term care facility with 76 beds. It provides 24-hour nurse supervision for residents who need that level of care, according to Health PEI's website.