ICD-10 Code E74.810 – Glucose transporter protein type 1 deficiency (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E74.810 – Glucose transporter protein type 1 deficiency
What it is
Glucose transporter protein type 1 deficiency is a rare inherited disorder that impairs glucose transport into the brain. You use this code for the documented diagnosis of GLUT1 deficiency syndrome.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include seizures, developmental delay, movement abnormalities, and symptoms that may worsen with fasting or improve after feeding.
When to use this code
Use E74.810 when the clinician documents GLUT1 deficiency, glucose transporter type 1 deficiency syndrome, or an equivalent confirmed diagnosis. Code it for encounters focused on evaluation, management, or follow-up of the disorder. If the record only notes suspected disease, check documentation before assigning the code.
Do not use for
Do not use this code for nonspecific hypoglycemia, seizure disorders without documented GLUT1 deficiency, or unrelated metabolic conditions. If the diagnosis is not clearly stated, check documentation.
Coding tip
Confirm that the note names GLUT1 deficiency specifically, since seizure or developmental findings alone are not enough for this code.