(CNN) -- Erik Roberts, an Army sergeant who was wounded in Iraq, underwent his 13th surgery recently to save his right leg from amputation. Imagine his shock when he got a bill for $3,000 for his treatment.



Army Sgt. Erik Roberts was badly wounded in Iraq with two comrades in April 2006.



"I just thought it was bull---- that I'm getting billed for being wounded in Iraq doing my job. I always put the mission first, and now that I was wounded in Iraq, they're sending me bills," he said.



"I put my life on the line and I was wounded in combat, and I came back and they're not going to take care of my medical bills?"



It's a level of outrage shared by his mother, as well as the doctor who performed the surgery.



"It's hard to understand why we're not taking care of guys like Erik whose injuries are clearly related to their service. They deserve the best care of anybody," said Dr. William Obremskey, an Air Force veteran and surgeon at Vanderbilt Orthopaedics in Nashville, Tennessee.  "For him to be responsible for $3,000, I think, is a little ridiculous or is uncalled for, particularly in this situation."



His mother, Robin Roberts, put it more succinctly: "Why should any soldier pay one penny of a medical bill from injuries that occurred while they were fighting in a war? That's what really frustrates me."



The Department of Veterans Affairs has now decided to pay his bill, but only after prodding from a U.S. senator who got involved after CNN brought it to his attention.



Roberts, of Warren, Ohio, is one of more than 31,100 U.S. troops to have been wounded in Iraq. An additional 4,262 have died in the war.



Roberts was wounded April 25, 2006, when roadside bombs tore through his Humvee in western Baghdad. Heat from the flames ignited the Humvee's ammunition, which popped off all around.  See Roberts describe getting blown up »



Roberts and his buddies, A.J. Jefferson and Luke Murphy, were badly wounded and bleeding on the ground after jumping from the burning vehicle. They were saved by comrades who rushed to help them.



"The truck automatically filled with smoke. There was fire coming from the middle of the truck. And I just feel my whole right side just like kind of explode," Roberts said. "I thought at that moment that my life was over, so I started praying."



All three soldiers survived the attack, but Murphy lost his leg. Days later, on his 23rd birthday, Roberts returned to the States. He underwent a series of life-saving surgeries, including 12 different ones to repair his fractured right leg. A metal rod was inserted in his upper leg to help the fracture heal.



He retired from the Army in October 2007, because of his war injuries, and enrolled in college last fall at Youngstown State University, majoring in finance and minoring in economics.



But in December, he says, a golf ball-sized lump appeared on his wounded leg. He says he went to a Veterans Affairs hospital and was told not to worry about it.



A few days later, he says, he went to the emergency room after the lump flared up more. A doctor there, he says, told him that the leg was badly infected and that it might have to be amputated.



Desperate for help, his mother contacted the Army surgeon who had saved her son's life two years earlier. That doctor referred him to Obremskey, the Vanderbilt surgeon.



The Robertses say the VA did not approve of them going outside the system. Erik Roberts says he had no choice -- it was have surgery or potentially lose his leg.



"I thought my leg was more important than the usual bureaucratic mess," he said.



His leg was saved. The $3,000 billed to Roberts wasn't for the surgery itself. It's a portion of the bill for six weeks of daily antibiotics to prevent the
Where did the soldier suffer the soldier's wounds? When was Erik Roberts wounded? What amount was the wounded soldier billed for? Where did Erik Roberts have 13 surgeries? When was Sgt. Erik Roberts wounded? Who was wounded in April 2006?
his right leg April 2006. $3,000 Vanderbilt Orthopaedics April 2006. Army Sgt. Erik Roberts
question: Where did the soldier suffer the soldier's wounds?, answer: his right leg | question: When was Erik Roberts wounded?, answer: April 2006. | question: What amount was the wounded soldier billed for?, answer: $3,000 | question: Where did Erik Roberts have 13 surgeries?, answer: Vanderbilt Orthopaedics | question: When was Sgt. Erik Roberts wounded?, answer: April 2006. | question: Who was wounded in April 2006?, answer: Army Sgt. Erik Roberts