You must report a work-related injury to your employer within 45 days after the accident or injury occurred. In cases involving occupational diseases or health conditions that were caused by work-related activities rather than a workplace accident, you should notify your employer as soon as is practical after you become aware of your injury. After you report your injury, you may need to file a separate workers' comp claim to receive benefits. In most cases, these claims must be filed within three years after an injury occurred or became known or within two years after receiving the last payment from an employer's worker's compensation insurance provider.