Mr. Brown is admitted to memorial hospital for an ulcer of the right posterior leg fatty layer involvement with possible infection on day three the area is more severe involving the muscle how should this be coded

Insulin is a peptide therapeutic used to manage type 1 diabetes, which affects more than 20 million people worldwide according to the international diabetes federation. a significant limitation to the broad distribution and use of insulin to treat type 1 diabetes is the fact that it must be administered by injection rather than orally. why is insulin administered by injection and not orally?