Assign ICD-9-CM Diagnosis Codes for the Following Inpatient Scenario

Essay

Assign ICD-9-CM diagnosis codes for the following inpatient scenario. (You will need to assign an admitting diagnosis, a principal diagnosis, and a secondary diagnosis(es).)
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57-year-old female presents with nausea and vomiting, which started last evening after the ingestion of tuna salad sandwich. She presented suspecting she had food poisoning. Patient was dehydrated, so she was rehydrated with fluids and given pain meds. She was admitted with gastroenteritis, probably viral.