Bartter's syndrome

This code identifies Bartter's syndrome, a rare, inherited kidney disorder characterized by a defect in the thick ascending limb of the loop of Henle. This defect leads to significant electrolyte imbalances, including hypokalemia, metabolic alkalosis, hyperreninemia, and hyperaldosteronism, often presenting in infancy or early childhood.

Use this code for patients diagnosed with Bartter's syndrome, confirmed by clinical presentation and laboratory findings of persistent hypokalemia, metabolic alkalosis, and elevated renin and aldosterone levels. Documentation should clearly indicate the diagnosis of Bartter's syndrome, distinguishing it from other causes of electrolyte disturbances.

• Differentiate from Gitelman's syndrome (E26.89), which presents with similar electrolyte abnormalities but typically has a later onset and milder symptoms.
• Ensure documentation specifies "Bartter's syndrome" to support this specific code.
• Code any associated manifestations, such as nephrocalcinosis or growth retardation, separately.