(CNN) — U.S. veterans are dying because of delays in diagnosis and treatment at VA hospitals.

At least 19 veterans have died because of delays in simple medical screenings like colonoscopies or endoscopies, at various VA hospitals or clinics, CNN has learned.

That’s according to an internal document from the U.S. Department of Veterans Affairs, obtained exclusively by CNN, that deals with patients diagnosed with cancer in 2010 and 2011.

The veterans were part of 82 vets who have died or are dying or have suffered serious injuries as a result of delayed diagnosis or treatment for colonoscopies or endoscopies.

Read more and see more video at CNN