My treating doctor sent me to a doctor to have an impairment rating done as I had reached 104 weeks. His IR was 21%. I just had an IR done by a designated doctor and his was 5%. Seems to be a great disparity here.
You should definitely have an attorney look at it. That disparity is large enough that somebody needs to look it over. Make sure that you immediately call the DWC and tell them that you want them to log your dispute of that impairment rating. You also need to file form 45 and check the box indicating that you dispute the findings of the designated doctor. When you file the 45, ask for a copy of it. The date stamp on it is your proof that you filed a dispute. Remember that you only have 90 days to dispute the first valid impairment rating. Disputing something does not mean that you are ready to pursue that dispute, so don't let the DWC tell you that you don't have the proper evidence to file such a dispute.
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