ICD-10 Code F51.12 – Insufficient Sleep Syndrome (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F51.12 – Insufficient sleep syndrome
What it is
F51.12 identifies insufficient sleep syndrome, a sleep-wake disorder caused by habitual, voluntary sleep curtailment. Use it when the problem is not insomnia, but simply not allowing enough time for sleep.
Clinical signs
Typical findings include chronic short sleep, daytime sleepiness, reduced alertness, and improvement after longer sleep opportunity. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record documents persistent sleep restriction due to schedule, lifestyle, or behavior, and the clinician diagnoses insufficient sleep syndrome. It may fit patients who sleep less than needed on most nights and report daytime impairment. Do not assume it from fatigue alone; confirm the diagnosis in the note.
Do not use for
Do not use F51.12 for insomnia, sleep apnea, narcolepsy, or sleep loss from acute illness or pain. Check documentation if the chart describes another primary sleep disorder.
Coding tip
Look for explicit wording such as “insufficient sleep syndrome” or documented habitual sleep restriction before assigning F51.12.