Good morning! I have a patient that has been in and out of the hospital for colon cancer, now on feeding tube and is near then end but refuses hospice. She keeps going into the hospital with "Acute renal failure due to dehydration-resolving upon d/c". This is a home health patient. I coded as N18.9 because it was due to dehydration due to cancer. (The hospital d/c codes do not have it coded as HTN CKD). The nurse exported it with HTN CKD and N18.9. I know there is a causal assumption between the two but the discharging MD clearly states d/t to dehydration. The nurses and the intact person who calls the insurance to pre-auth (the nurses has not even assessed the patient yet) and then change what I give them. So am I wrong in how it was coded? Thanks for any help.