F51 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Sleep disorders not due to a substance or known physiological condition.
Organic sleep disorders (G47.-)
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Insomnia not due to a substance or known physiological condition
Hypersomnia not due to a substance or known physiological condition
Sleepwalking [somnambulism]
Sleep terrors [night terrors]
Nightmare disorder
Other sleep disorders not due to a substance or known physiological condition
Sleep disorder not due to a substance or known physiological condition, unspecified
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