Symptoms associated with final diagnosis codes


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When a patient comes in with a symptom such as nausea and vomiting and the doctor diagnoses the patient with (ex pancreatitis), should the diagnosis on the claim be only pancreatitis as documented by the doctor or the reason the patient came in which was the nausea and vomiting followed by pancreatitis. The nausea and vomiting are symptoms of pancreatitis and per the guidelines, they can be coded if no confirmed diagnosis is documented.Or should the reason for the visit of nausea and vomiting followed by the confirmed diagnosis of pancreatitis be coded? This always confuses me when the symptom the patient presents with is a part of the confirmed diagnosis.