2026 ICD-10-CM Diagnosis Code G47.35Congenital central alveolar hypoventilation syndrome

ICD-10-CM Codes›G00–G99›G40-G47›G47

ICD-10-CM G47.35
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G47.35 is a billable ICD-10-CM diagnosis code for congenital central alveolar hypoventilation syndrome. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 11 through 13, 91 through 93. Coders also document this condition as central alveolar hypoventilation syndrome. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Sleep wake disorders.

Code Identity

ICD-10-CM Code
G47.35
Billable Status
Yes — Valid for Submission
Code Describes
Congenital central alveolar hypoventilation syndrome
Short Description
Congenital central alveolar hypoventilation syndrome
Same as the full description in the CMS dataset.
Parent Code
G47.3
Sleep apnea

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG40-G47Episodic and paroxysmal disorders
CategoryG47Sleep disorders
This CodeG47.35Congenital central alveolar hypoventilation syndrome

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Central alveolar hypoventilation syndrome
  • Congenital central hypoventilation
  • Congenital dilatation of colon
  • Haddad syndrome
  • Pulmonary hypertension associated with chronic underventilation
  • Pulmonary hypertension due to alveolar hypoventilation disorder
  • Pulmonary hypertension due to lung disease and/or hypoxia

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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 Apnea

Sleep apnea is a common disorder that causes your breathing to stop or get very shallow. Breathing pauses can last from a few seconds to minutes. They may occur 30 times or more an hour.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert G47.35 to ICD-9-CMHistory

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

ICD-9-CM
327.25 Cong cntrl hypovent synd
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 G47.35Overview

What is the ICD-10 code for congenital central alveolar hypoventilation syndrome?

The ICD-10-CM code for congenital central alveolar hypoventilation syndrome is G47.35 (sometimes written as G4735). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is G47.35 (Sleep apnea) a billable code?

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

What MS-DRG does G47.35 group to?

When congenital central alveolar hypoventilation syndrome is the principal diagnosis on an inpatient stay, it groups to MS-DRG 11, 12, 13, 91, 92, 93, with relative weights from 0.7963 to 5.4541 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of G47.35?

Under the General Equivalence Mappings, congenital central alveolar hypoventilation syndrome converts to ICD-9-CM 327.25 (cong cntrl hypovent synd). The mapping is a direct match.