F51.3 Sleepwalking [somnambulism]

Billable ICD-10-CM code, FY2026.

Applicable to

• Non-rapid eye movement sleep arousal disorders, sleepwalking type

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

Excludes2 (not included here)

• organic sleep disorders (G47.-)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 307.46 Sleep arousal disorder (approximate)

Code annotations containing back-references to F51.3

Back-references to F51.3

• Type 2 Excludes: G47 Sleep disorders ("sleepwalking (F51.3)")

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 F51.3

• Disorder (of) › non-rapid eye movement sleep arousal › sleepwalking type
• Disorder (of) › sleep › walking
• Insomnia (organic) › learned
• Sleep › walking
• Somnambulism
• Walking › sleep

Nearby codes

• F51.1 Hypersomnia not due to a substance or known physiological condition
• F51.11 Primary hypersomnia
• F51.12 Insufficient sleep syndrome
• F51.13 Hypersomnia due to other mental disorder
• F51.19 Other hypersomnia not due to a substance or known physiological condition
• F51.3 Sleepwalking [somnambulism] (this code)
• 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