F51.01 Primary insomnia

Billable ICD-10-CM code, FY2026.

Applicable to

• Idiopathic insomnia

Applies from F51 Sleep disorders not due to a substance or known physiological condition

Excludes2 (not included here)

• organic sleep disorders (G47.-)

Applies from F51.0 Insomnia not due to a substance or known physiological condition

Excludes2 (not included here)

• alcohol related insomnia (F10.182, F10.282, F10.982)
• drug-related insomnia (F11.182, F11.282, F11.982, F13.182, F13.282, F13.982, F14.182, F14.282, F14.982, F15.182, F15.282, F15.982, F19.182, F19.282, F19.982)
• insomnia NOS (G47.0-)
• insomnia due to known physiological condition (G47.0-)
• organic insomnia (G47.0-)
• sleep deprivation (Z72.820)

MS-DRG index

Defines the logic of DRG(s) 887 in MDC 19.

Approximate ICD-9-CM (GEMs)

• 307.42 Persistent disorder of initiating or maintaining sleep (approximate)

Code annotations containing back-references to F51.01

Back-references to F51.01

• Type 2 Excludes: G47.0 Insomnia ("idiopathic insomnia (F51.01)")
• Type 2 Excludes: G47.0 Insomnia ("primary insomnia (F51.01)")

Back-references to F51.0

• Type 2 Excludes: G47.0 Insomnia ("insomnia not due to a substance or known physiological condition (F51.0-)")
• Type 2 Excludes: G47.0 Insomnia ("nonorganic insomnia (F51.0-)")
• Type 1 Excludes: Z72.821 Inadequate sleep hygiene ("insomnia (F51.0-, G47.0-)")

Back-references to F51

• Type 2 Excludes: F98 Other behavioral and emotional disorders with onset usually occurring in childhood and adolescence ("sleep disorders not due to a substance or known physiological condition (F51.-)")
• Type 2 Excludes: G47 Sleep disorders ("nonorganic sleep disorders (F51.-)")

Diagnosis Index entries for F51.01

• Insomnia (organic) › idiopathic
• Insomnia (organic) › nonorganic origin
• Insomnia (organic) › not due to a substance or known physiological condition
• Insomnia (organic) › primary

Nearby codes

• F51 Sleep disorders not due to a substance or known physiological condition
• F51.0 Insomnia not due to a substance or known physiological condition
• F51.01 Primary insomnia (this code)
• F51.02 Adjustment insomnia
• F51.03 Paradoxical insomnia
• F51.04 Psychophysiologic insomnia
• F51.05 Insomnia due to other mental disorder
• F51.09 Other insomnia not due to a substance or known physiological condition