The Massachusetts Report of Occupational Injury or Illness is a mandatory form that employers in Massachusetts must complete and submit to the Department of Industrial Accidents (DID) when an employee sustains a work-related injury or illness. This report helps the DID and other relevant agencies track workplace accidents, evaluate safety measures, and provide necessary benefits to the affected employees. Keywords: Massachusetts report, occupational injury, occupational illness, Department of Industrial Accidents, workplace accidents, safety measures, benefits. Different Types of Massachusetts Report of Occupational Injury or Illness: 1. Form 101: Employer's First Report of Injury or Fatality: This report is filed by the employer within seven days of learning about a work-related injury or fatality that results in lost work time beyond the day of the injury or illness. 2. Form 101A: Employer's Supplemental Report of Injury or Fatality: If there are any changes or additions to the information previously reported on Form 101, employers must complete Form 101A within seven days of becoming aware of such changes. 3. Form 102: Employee's Claim for Workers' Compensation Benefits: This report is filed by the injured employee to initiate a claim for workers' compensation benefits. 4. Form 153: Request to Insurer for Employee's Claim Information: This report allows injured employees or their representatives to request important claim information from the employer's workers' compensation insurance carrier. It is essential for employers to accurately complete and submit these reports within the specified timeframes to ensure compliance with Massachusetts law and facilitate the processing of workers' compensation claims. Failure to comply with these reporting requirements may result in penalties or delays in the provision of benefits to injured employees.