A woman in Maine got 500 letters from United Healthcare within five days . Stephanie Lay said she found the piles of letters from the insurance company stashed in her mailbox between Thursday and Monday. “A week ago Thursday was the first wave of letters, I got 46 letters,” she told CNN. “I immediately called United Healthcare insurance and told them I received 46 letters of the same letter.” And the letters just kept coming, piling up to more than 500 by Monday. They were addressed to her son, who has autism and lives in a private care facility, she said. But instead of her sons name inside when you opened them, the letters said Dear Maines Department of Health and Human Services in Cincinnati, she . The letters were about a dollar 54 or dollar 0 healthcare claim that United Healthcare said is not covered, Lay said. When she asked United Healthcare why she was receiving a mountain of letters, she was told it was a coding issue, she said. In a statement, United Healthcare told CNN its working to resolve the issue but it cannot provide details due to privacy requirements. “We have determined the cause of the problem. We are very sorry this occurred, and we have contacted the family to discuss the situation with them,” the health insurer said. Lay said the letters all have a message at the bottom urging people to go paperless. ” Im thinking they had to take down half of a forest just to send this,” she said.