Hello, while I can not speak to holding claims for Pathology results, I feel this would be dictated by the turn around time of results.
I can tell you the difference between D12.xx series and K63.5. The difference is that D12.xx series is for: "Included in this category are polyps specified as adenomatous or sessile serrated, dysplasia of the colon, familial polyposis, and tubulovillous adenomas. Unlike hyperplastic polyps, which have no neoplastic potential, adenomatous polyps may be precancerous." ~Encoder D12.4 "Lay Description", while K63.5 is for: " Included in this code are polyps specified as hyperplastic, which are not precancerous and are classified differently from benign or adenomatous polyps. Also reported here are colon polyps without further specificity." ~Encoder "Lay Description".