2026 ICD-10-CM Diagnosis Code F51.3Sleepwalking [somnambulism]
ICD-10-CM Codes›F01–F99›F50-F59›F51
- Billable — Valid for Submission
- Chronic Condition
F51.3 is a billable ICD-10-CM diagnosis code for sleepwalking [somnambulism]. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 887. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Sleep wake disorders.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Blank, staring face while sleep walking
- Finding related to sleep walking
- Low level of awareness while sleep walking
- Low level of motor skill while sleep walking
- Low level of reactivity while sleep walking
- No recollection of sleep walk
- Nocturnal sleep-related eating disorder
- Non-organic sleep disorder
- Not easily wakened from sleep walking
- Sleep automatism
- Sleep terror disorder
- Sleep walking disorder
- Somnambulism co-occurrent with sleep terror disorder
- Unresponsive
- Unresponsive to communication while sleep walking
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Non-rapid eye movement sleep arousal disorders, sleepwalking type
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Disorder (of) See Also: Disease;
learned F51.3
Somnambulism F51.3
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Sleep Terror Disorder
a sleep disorder characterized by abrupt awakenings from sleep with a panicky scream, accompanied by signs of autonomic arousal. there is no recall of a nightmare and the person has amnesia for the event in the morning.
Patient EducationClinical
Sleep Disorders
Sleep is a complex biological process. While you are sleeping, you are unconscious, but your brain and body functions are still active. They are doing a number of important jobs that help you stay healthy and function at your best. So when you don't get enough quality sleep, it does more than just make you feel tired.
The full article covers:
- What is sleep?
- What are sleep disorders?
- What causes sleep disorders?
- What are the symptoms of sleep disorders?
- How are sleep disorders diagnosed?
- What are the treatments for sleep disorders?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert F51.3 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About F51.3Overview
What is the ICD-10 code for sleepwalking [somnambulism]?
The ICD-10-CM code for sleepwalking [somnambulism] is F51.3 (sometimes written as F513). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is F51.3 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report sleepwalking [somnambulism] on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does F51.3 group to?
When sleepwalking [somnambulism] is the principal diagnosis on an inpatient stay, it groups to MS-DRG 887 (other Mental Disorder Diagnoses), which carries a relative weight of 1.0709. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of F51.3?
Under the General Equivalence Mappings, sleepwalking [somnambulism] converts to ICD-9-CM 307.46 (sleep arousal disorder). The mapping is approximate, so confirm the match fits the documentation.
