2026 ICD-10-CM Diagnosis Code G47.50Parasomnia, unspecified

ICD-10-CM Codes›G00–G99›G40-G47›G47

ICD-10-CM G47.50
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G47.50 is a billable ICD-10-CM diagnosis code for parasomnia, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 154 through 156. Coders also document this condition as organic parasomnia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Sleep wake disorders.

Code Identity

ICD-10-CM Code
G47.50
Billable Status
Yes — Valid for Submission
Code Describes
Parasomnia, unspecified
Short Description
Parasomnia, unspecified
Same as the full description in the CMS dataset.
Parent Code
G47.5
Parasomnia

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG40-G47Episodic and paroxysmal disorders
CategoryG47Sleep disorders
This CodeG47.50Parasomnia, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Organic parasomnia
  • Parasomnia
  • Reaction to sudden wakening
  • Sleep automatism
  • Sleep starts

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Parasomnia NOS

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Disorder(of)
      • sleep
        • parasomnia type
    • Parasomnia
    • Parasomnia
      • organic

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NVS016
Sleep wake disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

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 G47.50 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
327.40 Organic parasomnia NOS
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About G47.50Overview

Is G47.50 (Parasomnia) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report parasomnia, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does G47.50 group to?

When parasomnia, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 154, 155, 156, with relative weights from 0.6911 to 1.5635 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of G47.50?

Under the General Equivalence Mappings, parasomnia, unspecified converts to ICD-9-CM 327.40 (organic parasomnia NOS). The mapping is a direct match.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.