Dehydration

This code signifies a state of insufficient total body water, resulting from inadequate fluid intake, excessive fluid loss, or both. It represents a reduction in the body's normal fluid content, which can impair normal physiological functions.

Apply this code when documentation explicitly states "dehydration" as a diagnosis. This is commonly seen in patients with gastroenteritis, prolonged fever, excessive sweating, or inadequate oral intake due to illness or altered mental status. Supporting documentation includes physician notes, nurses' assessments, and laboratory findings indicating elevated BUN/creatinine ratio, increased hematocrit, or hypernatremia.

• Do not code dehydration as a primary diagnosis if it is a symptom of another condition, such as gastroenteritis, unless the dehydration itself is the primary reason for the encounter or admission.
• Always look for and code the underlying cause of dehydration if known and documented.
• Distinguish from fluid overload or electrolyte imbalances, which are coded separately unless directly caused by the dehydration.