If you've had RHC or SIA payments that have been processed incorrectly, check out this informative pdf from CMS. You'll need to submit your claims needing adjustment to your Medicare Administrative Contractors (MACs). You'll need to provide the following info (per the above-linked article):
• the document control numbers (DCNs) of the claims to be adjusted
• the dates of service for each claim, and
• whether the error is related to RHC days or SIA amounts
You can read the pdf above for more info, or comment below. I'd love to answer any further questions you may have!