2026 ICD-10-CM Diagnosis Code G47.54Parasomnia in conditions classified elsewhere

ICD-10-CM Codes›G00–G99›G40-G47›G47

ICD-10-CM G47.54
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G47.54 is a billable ICD-10-CM diagnosis code for parasomnia in conditions classified elsewhere. 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. The code is a manifestation code that cannot be reported as the principal diagnosis. Coders also document this condition as autoimmune encephalopathy with parasomnia and obstructive sleep apnea. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Sleep wake disorders.

Code Identity

ICD-10-CM Code
G47.54
Billable Status
Yes — Valid for Submission
Code Describes
Parasomnia in conditions classified elsewhere
Short Description
Parasomnia in conditions classified elsewhere
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 CodeG47.54Parasomnia in conditions classified elsewhere

Code EditsBilling

Medicare Code Editor checks that affect claim validity for G47.54.

Manifestation diagnoses
Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and therefore should not be used as a principal diagnosis.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Autoimmune encephalopathy with parasomnia and obstructive sleep apnea
  • Secondary parasomnia

Tabular List NotesGuidance

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

Code First

  • underlying condition

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.

    • Parasomnia
      • in conditions classified elsewhere

Clinical ClassificationClinical

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

CCSR NVS016
Sleep wake disorders
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Obstructive Sleep Apnea Syndrome

    a disorder characterized by recurrent episodic disruptions of breathing during sleep. it is caused by the intermittent relaxation of pharyngeal muscles leading to the narrowing or complete blockage of the upper airway. this results in compensatory arousal from sleep to breathe again. an anatomically narrow airway from body habitus or enlarged pharyngeal structures may also predispose to obstruction. clinical presentation usually includes snoring, daytime sleepiness, difficulty concentrating and fatigue. clinical course may progress to chronic hypoxemia with cardiovascular and cerebrovascular sequelae.

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 G47.54 to ICD-9-CMHistory

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

ICD-9-CM
327.44 Parasomnia oth diseases
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 G47.54Overview

Is G47.54 (Parasomnia) a billable code?

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

What MS-DRG does G47.54 group to?

On inpatient claims, parasomnia in conditions classified elsewhere maps to MS-DRG 154, 155, 156, with relative weights from 0.6911 to 1.5635 depending on complications. Higher weights mean higher Medicare reimbursement.

Can G47.54 be a principal diagnosis?

No. This is a manifestation code: parasomnia in conditions classified elsewhere describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.

What is the ICD-9 equivalent of G47.54?

Under the General Equivalence Mappings, parasomnia in conditions classified elsewhere converts to ICD-9-CM 327.44 (parasomnia oth diseases). 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.