The job must be "suitable" as defined by the NC Workers' Comp Act. That definition loosened up with the 2011changes to the law. If the job is within the restrictions your doctor has given, regardless of whether you get paid a lot less, then you likely will have to at least try to do the work. If it is less $, you should be compensated for what is called "partial wage loss". You should make sure that the Dr is aware of the job duties and has given the okay. You could also be entitled to a second opinion evaluation with a different physician.
In terms of communication, the waters were muddied a bit again with the 2011 changes.
You should seek the advice of counsel and get someone to help protect you and fight for your rights under the Act. Consultations are free and you should take that opportunity.
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In colorado the doctor would have to agree to it before they offer it so its possible that they have talked to the dr behind your back and gotten them to agree. I would check with the drs office on monday if you are concerned you will not be able to handle it I would also show up if you don't get any answers. An workers compensation attorney in your state can indicate what the consequences might be.
First confirm with your doctor what you light duty restrictions are. Secondly, you may want to talk with a local worker's comp. attorney to see what your legal options/rights are.
DISCLAIMER: David J. McCormick is licensed to practice law in the State of Wisconsin and this answer is being provided for informational purposes only because the laws of your jurisdiction may differ. This answer based on general legal principles and is not intended for the purpose of providing specific legal advice or opinions. Under no circumstances does this answer constitute the establishment of an attorney-client relationship.