As soon as you know that you're injured, be sure to tell your employer. From there, seek treatment from a doctor as soon as possible. In Colorado, you have four working days from the date of the injury to report the injury to your employer in writing. Failure to do so could result in a loss of benefits for each day that a written notice isn't provided. Those who are unable to meet this requirement may have someone do so on their behalf. Continue reading: How to File a Work Injury Claim