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F51.3 · Billable

2026 ICD-10-CM Diagnosis Code F51.3

Sleepwalking [somnambulism]

About F51.3

Code

F51.3

Description

Sleepwalking [somnambulism]

Billable

Yes — billable on its own

Parent code

F51 (Sleep disorders not due to a substance or known physiological condition)

Category

F50-F59 — Behavioral syndromes associated with physiological disturbances and physical factors

Set

ICD-10-CM 2026

Clinical context

Inherited from F51 (Sleep disorders not due to a substance or known physiological condition)

F51 codes non-organic sleep disorders — distinct from G47 sleep disorders, which cover those due to medical causes. Includes the insomnia subtypes (F51.01–F51.09), hypersomnia (F51.11–F51.19), parasomnias (F51.3 sleepwalking, F51.4 night terrors, F51.5 nightmare disorder), and unspecified codes. Document sleep onset/maintenance pattern, daytime impairment, and rule out substance-induced and primary medical causes (which would route to G47).

Code details

Code attributes

  • Non-billable/Non-specific code

Coding rules

  • Specify the leaf code — the parent code (e.g. F32) is a navigational header; billing requires a leaf code (F32.0, F32.1, etc.) that matches the documented presentation.
  • Document onset, course, and severity (mild / moderate / severe) plus functional impact. Payers use this combination when adjudicating medical necessity.
  • Attach a validated instrument score (PHQ-9, GAD-7, PCL-5, or equivalent) at intake and at follow-up where applicable. Objective measures support code selection and continued authorization.
  • Review at every visit and update if presentation changes — including remission and partial remission states.

Sources

  • Centers for Medicare & Medicaid Services — 2026 ICD-10-CM
  • AAPC — ICD-10-CM Code Lookup
  • CDC — ICD-10-CM Official Guidelines for Coding and Reporting

This reference is provided for billing and documentation guidance only. It is not medical advice. For clinical decision-making, consult the current CMS ICD-10-CM Official Guidelines for Coding and Reporting, and verify code applicability against the patient's documented clinical findings.

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