Wiki diverticulitis perforation vs crohn's disease

[Lcervant19]

i have a hospital follow up patient that has the chief complaint of "perforation and abscess of large intestine concurrent with and due to diverticulitis". The imaging shows a left colon perforation. the patient also has "medically difficult to manage IBD". it was difficult for the physician to determine if this was purely diverticulitis in known active IBD or crohn's. He wrote, "IF IBD consideration should be end/diverting ileostomy. I'm concerned if we perform a segmental colectomy she may have poor motility in the right colon. But, ileostomy may be difficult to manage fluid status".
So my question is how do I know what should be the dx code? is this something that i have to take back to my GI doctor?