Can anyone help me assign diagnosis codes? I work in an outpatient laboratory and get scripts with such things as these:
TPN - is this codeable, and what code would I assign?

elevated thyroid tests = Big debate at the lab on this one

elevated GFR =

decreased GFR =

elevated BP =

elevated Ferritin =

decreased Ferritin =

Thanks in advance for your help but the girls in the billing office where I work are still arguing about their answers to these and I agreed to post these questions and hopefully get everyone on the same page.