E87.1 Hypo-osmolality and hyponatremia

Coding notes

From the ICD-10-CM FY2027 (effective October 1, 2026) tabular list. Notes on a parent code or category apply here too.

Also covers

• Sodium [Na] deficiency

Excludes1

Not coded together with this code. The exception is when the two conditions are unrelated to each other.

• syndrome of inappropriate secretion of antidiuretic hormone (E22.2)
• diabetes insipidus (E23.2)
• electrolyte imbalance associated with hyperemesis gravidarum (O21.1)
• electrolyte imbalance following ectopic or molar pregnancy (O08.5)
• familial periodic paralysis (G72.3)
• metabolic acidemia in newborn, unspecified (P19.9)
• androgen insensitivity syndrome (E34.5-)
• congenital adrenal hyperplasia (E25.0)
• hemolytic anemias attributable to enzyme disorders (D55.-)
• Marfan syndrome (Q87.4-)
• 5-alpha-reductase deficiency (E29.1)

Excludes2

Not part of this code, but both can be coded when both are documented.

• Ehlers-Danlos syndromes (Q79.6-)