Darcy, I appreciate your help. I'm new to the DRG world, and FOR SURE new to OB. My UB-04 does not have a procedure code, and they have billed Z38.31. One infant was with hypoglycemia in the fist couple of hours. They fed the premature infant with tube feeding supplementation. My thoughts were Z38.31 wasn't appropriate without a billed procedure and a more appropriate code would be P07.39. However, as I got to thinking, I thought, "Well how can you have preterm newborn w/ out it's respective Z38.31, even though there is no procedure.