If a patient goes to get a test done for Adult Growth Hormone Deficiency (AGHD) - either a Insulin Tolerance Test (ITT) (80435) or a Glucagon Stimulation Test (80430) - the patient may be admitted for observation but only as an outpatient. Does anyone happens to know the observation code that's used? (it was told me that it would be a code that captures 23 hours observation)