According to the Occupational Safety and Health Administration (OSHA) an injury or illness is considered to be work-related if an event or exposure in the work environment caused or contributed to the condition, or significantly aggravated a preexisting condition.
As an employer you are required to report death, loss of consciousness, days away from work, restricted work activity or job transfer, or medical treatment beyond first aid. OSHA requires an annual form to be filled out to properly report these incidents, Form 300.
You can find the complete form packet here. This PDF includes instructions on how to fill the form out properly and includes the appropriate logs, summaries, and worksheets you will need to be in compliance with OSHA’s standards. It also covers in detail what needs to be reported and how to classify certain ailments or injuries. All OSHA 300 logs must be posted February 1-April 30 annually.