I recently received a denial from an insurance company for "invalid second diagnosis code". The patient has Type II diabetes and code E11.9 was used.
The 2017 ICD-10 book shows that you need to use an additional code to identify "control using" …either insulin or an oral drug. I have corrected this code but the question that came up is – what do you use if the patient is diet controlled? I believe it will be denied if I don’t have a second code now and I have been unable to come up with an answer. Thank in advance for any advice.