Where the appeal goes
In New York, a party who disagrees with a Workers' Compensation Law Judge's decision can ask for review by a panel of Board commissioners. The application has a short, strict deadline and a required format, and late or incomplete applications can be denied for that reason alone. The panel usually reviews the existing record rather than hearing new testimony, so the evidence presented at the hearing level matters a great deal. Further review may be available within the Board in some situations, and after that an appeal can be taken to the Appellate Division, Third Department. Other states use their own boards and courts, with different steps.
What can and cannot be argued
Board review generally looks at whether the judge's decision fits the evidence and the law. New evidence is usually limited to what could not have been presented earlier with reasonable effort. That makes the hearing transcript, the medical reports in the record, and the judge's stated reasons the core of the appeal. Objections raised at the hearing level are easier to pursue than issues raised for the first time on review, which is one reason to have representation before the hearing rather than only after. A clear statement of exactly which findings are wrong, and why, tends to serve better than a general complaint about the outcome.
While review is pending
Asking for review does not automatically put every part of a decision on hold, and payment obligations can continue in some situations while the review is pending. If the carrier is the one appealing, you may still need to attend medical appointments and meet ongoing requirements. In a first meeting we read the decision and the transcript, identify the issues worth raising, and confirm the deadline. If an appeal is not the right path, a new hearing on a different issue or a later request based on changed medical facts may make more sense.