The first medical provider you see will file the claim paperwork with L&I if you tell them you were injured on the job. You can also file online at FastFile. Make sure to tell your provider in detail how you were injured. Report to him every injury, or aggravation of previous injuries, caused by the accident. If it hurts or feels different, report it to your medical provider. Getting conditions added for coverage under the claim is more difficult if they were not first reported to the medical provider.