Secondary adrenal insufficiency diagnosed.  Patient presents with symptoms consistent with adrenal insufficiency including fatigue, weakness, anorexia, weight loss, and salt craving.  Symptoms onset was gradual.  No history of primary adrenal disease or adrenal surgery.  Patient has a history of long-term glucocorticoid use for [Specify underlying condition requiring glucocorticoid treatment, e.g., rheumatoid arthritis, asthma, Crohn's disease] and recently discontinued or reduced the dose of [Specify glucocorticoid name and dosage].  Physical exam revealed orthostatic hypotension and hyperpigmentation is absent, differentiating this from primary adrenal insufficiency (Addison's disease).  Laboratory findings demonstrate low morning cortisol levels.  ACTH stimulation test revealed a suboptimal cortisol response, confirming secondary adrenal insufficiency.  Differential diagnosis included other causes of fatigue and weakness, such as hypothyroidism and anemia, which were ruled out through appropriate laboratory testing.  The patient's current glucocorticoid regimen will be adjusted to address the adrenal insufficiency.  Patient education provided on the importance of medication adherence, sick day rules, and potential complications of adrenal crisis.  Follow-up appointment scheduled to monitor cortisol levels and symptom resolution.  ICD-10 code E27.3, secondary adrenal insufficiency, assigned.  Medical billing codes will reflect evaluation and management services as well as laboratory testing.