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ICD-10-CM category F51: Sleep disorders not due to a substance or known physiological condition

Category F51 is a heading in chapter 5 (Mental, Behavioral and Neurodevelopmental disorders (F01-F99)), section Behavioral syndromes associated with physiological disturbances and physical factors (F50-F59). It is not billable; report one of the 15 complete codes below.

Notes that apply to every F51 code

Excludes2 (not part of this condition, may be coded together)
  • organic sleep disorders (G47.-)

Billable codes in F51

Billable FY2027 ICD-10-CM codes in category F51
CodeDescription
F51.01Primary insomnia
F51.02Adjustment insomnia
F51.03Paradoxical insomnia
F51.04Psychophysiologic insomnia
F51.05Insomnia due to other mental disorder
F51.09Other insomnia not due to a substance or known physiological condition
F51.11Primary hypersomnia
F51.12Insufficient sleep syndrome
F51.13Hypersomnia due to other mental disorder
F51.19Other hypersomnia not due to a substance or known physiological condition
F51.3Sleepwalking [somnambulism]
F51.4Sleep terrors [night terrors]
F51.5Nightmare disorder
F51.8Other sleep disorders not due to a substance or known physiological condition
F51.9Sleep disorder not due to a substance or known physiological condition, unspecified

Sources

Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-10. Verify against the primary file before billing or contracting decisions. The reference methodology explains how each figure is computed from these files.

Codes from the FY2027 ICD-10-CM files (all chapters). Report the code that matches the documentation and the Official Guidelines; this list is not coding advice.