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.
Type 2 excludes
Organic sleep disorders (G47.-)
Codes
F51.0
Insomnia not due to a substance or known physiological condition
F51.1
Hypersomnia not due to a substance or known physiological condition
F51.3
Sleepwalking [somnambulism]
F51.4
Sleep terrors [night terrors]
F51.5
Nightmare disorder
F51.8
Other sleep disorders not due to a substance or known physiological condition
F51.9
Sleep disorder not due to a substance or known physiological condition, unspecified
Versions
2026
No changes
2025
No changes
2024
No changes
2023
No changes
2022
No changes
2021
No changes
2020
No changes
2019
No changes
2018
No changes
2017
No changes
2016
New code