Hopefully someone out there has BWC experience! We are struggling with a swingbed chart in which the patient was admitted to our facility for rehab after a total knee at another facility. Our social worker and the surgeon (from other facility) documented traumatic arthropathy which was approved by BWC. However, our admitting physician only dictated left total knee. Our billing office wants us to change the code summary as a C-9 was faxed to us from BWC. I am not comfortable changing codes from what physician dictated but do not know much about C-9 involvement.