While patient care is both a doctor and patient responsibility, a new study in England puts twenty-four thousand dearths fro Diabetes square on the government run health care system.
The first-ever audit of patient deaths from the condition said basic health checks, a good diet and regular medication could prevent most of them.
Diabetes UK said it was vital the NHS provided high quality care.
An estimated 2.3 million people in the UK are affected; about a third of them do not realise they have the condition.
It means their bodies cannot use glucose properly. If they do not manage it, they can develop potentially fatal complications like heart or kidney failure.
The report, by the NHS Information Centre, compared information about people with diabetes in England with data from death records.
Around 70-75,000 diabetic patients die every year.
The study estimated that a third of them were dying from causes that could be avoided if their condition were better managed.