E27.3 Drug-induced adrenocortical insufficiency

Name of the Condition

• Drug-Induced Adrenocortical Insufficiency
• ICD-10 Code: E27.3

Summary

Drug-induced adrenocortical insufficiency is a condition where the adrenal glands produce insufficient hormones (primarily cortisol and aldosterone) due to the effects of medications. This disrupts the body’s ability to regulate stress, metabolism, and electrolyte balance, leading to systemic symptoms. The condition is reversible if the causative drug is identified and discontinued or adjusted.

Causes

The primary cause is the use of medications that suppress adrenal hormone production or interfere with the hypothalamic-pituitary-adrenal (HPA) axis. Common culprits include prolonged corticosteroid therapy (especially when abruptly stopped), certain antifungal drugs, and medications that accelerate corticosteroid metabolism. Other drugs may directly damage adrenal tissue or inhibit hormone synthesis.

Risk Factors

• Prolonged use of exogenous corticosteroids (e.g., prednisone)
• Abrupt discontinuation of corticosteroid therapy
• Use of medications that induce liver enzymes (e.g., some anticonvulsants)
• Concurrent use of drugs that inhibit adrenal function (e.g., ketoconazole)
• High doses of inhaled or topical corticosteroids over extended periods

Symptoms

• Fatigue, weakness, and lethargy
• Nausea, vomiting, or abdominal pain
• Low blood pressure and dizziness (especially upon standing)
• Salt cravings and dehydration
• Unexplained weight loss and decreased appetite
• Mood changes or irritability
• Hyperpigmentation (rare, unless combined with primary adrenal insufficiency)

Diagnosis

Diagnosis involves evaluating clinical symptoms, measuring blood levels of cortisol and adrenocorticotropic hormone (ACTH), and conducting a cosyntropin stimulation test to assess adrenal reserve. A thorough medication history is critical to identify potential causative drugs. Additional tests may include electrolyte panels to check for imbalances (e.g., low sodium, high potassium).

Treatment Options

Treatment focuses on discontinuing or adjusting the causative drug and replacing deficient hormones. Acute cases may require intravenous hydrocortisone, followed by oral corticosteroid replacement. Mineralocorticoid replacement (e.g., fludrocortisone) may be necessary if aldosterone levels are low. Long-term management involves monitoring hormone levels and tapering corticosteroids gradually if used chronically.

Prognosis and Follow-Up

Prognosis is generally good if the causative drug is identified and discontinued. Most patients recover adrenal function over weeks to months, though some may require temporary or permanent hormone replacement. Follow-up includes regular monitoring of cortisol levels, electrolytes, and blood pressure, especially during stress (e.g., illness, surgery) when higher corticosteroid doses may be needed.

Complications

• Adrenal crisis (a life-threatening condition with severe hypotension, shock, and organ failure)
• Electrolyte imbalances (e.g., hyponatremia, hyperkalemia)
• Chronic fatigue or weakness if hormone replacement is inadequate
• Increased risk of infection due to impaired immune function

Lifestyle & Prevention

• Avoid abrupt discontinuation of corticosteroids; taper gradually under medical supervision.
• Inform healthcare providers of all medications, including over-the-counter drugs and supplements.
• Carry a medical alert bracelet or card indicating adrenal insufficiency and medication needs.
• Maintain adequate salt intake (if advised) and stay hydrated, especially in hot weather.
• Manage stress and illness proactively, as these can increase cortisol demands.

When to Seek Professional Help

Seek immediate medical attention if you experience severe fatigue, dizziness, vomiting, or confusion, as these may indicate adrenal crisis. Contact your provider if symptoms worsen or new symptoms (e.g., persistent low blood pressure, salt cravings) develop, especially after starting or stopping a new medication.

Tips for Medical Coders

Document the specific drug or class of drugs causing the insufficiency, as this is critical for accurate coding. Ensure the medical record supports the temporal relationship between drug exposure and symptom onset. Note whether the condition is acute or chronic, as this may impact coding specificity. Avoid coding for drug-induced insufficiency without clear documentation of the causative agent.