2026 ICD-10-CM Diagnosis Code I47.21Torsades de pointes

ICD-10-CM Codes›I00–I99›I30-I5A›I47

ICD-10-CM I47.21
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I47.21 is a billable ICD-10-CM diagnosis code for torsades de pointes. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 308 through 310. Coders also document this condition as torsade de pointes with short coupling interval syndrome. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cardiac dysrhythmias.

Code Identity

ICD-10-CM Code
I47.21
Billable Status
Yes — Valid for Submission
Code Describes
Torsades de pointes
Short Description
Torsades de pointes
Same as the full description in the CMS dataset.
Parent Code
I47.2
Ventricular tachycardia

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI30-I5AOther forms of heart disease
CategoryI47Paroxysmal tachycardia
This CodeI47.21Torsades de pointes

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Torsade de pointes with short coupling interval syndrome
  • Torsades de pointe caused by drug
  • Torsades de pointes
  • Ventricular tachycardia, polymorphic

Tabular List NotesGuidance

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

Code Also

  • , if applicable, long QT syndrome I45.81

Use Additional Code

  • code for adverse effect, if applicable, to identify drug T36 T50

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.

    • Torsades de pointes

Clinical ClassificationClinical

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

CCSR CIR017
Cardiac dysrhythmias
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Torsades de Pointes

    a malignant form of polymorphic ventricular tachycardia that is characterized by heart rate between 200 and 250 beats per minute, and qrs complexes with changing amplitude and twisting of the points. the term also describes the syndrome of tachycardia with prolonged ventricular repolarization, long qt intervals exceeding 500 milliseconds or bradycardia. torsades de pointes may be self-limited or may progress to ventricular fibrillation.

Patient EducationClinical

Arrhythmia

An arrhythmia is a problem with the rate or rhythm of your heartbeat. Your heart beats too quickly, too slowly, or with an irregular pattern. Changes in the electrical signals that control your heartbeat cause arrhythmias.

The full article covers:

  • What is an arrhythmia?
  • What causes an arrhythmia?
  • What are the symptoms of an arrhythmia?
  • How is an arrhythmia diagnosed?
  • What are the treatments for an arrhythmia?
  • Can arrhythmias be prevented?

Read the full article at MedlinePlus

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

Code History & ChangesHistory

Replacement I47.21 replaces the following previously assigned code(s):

  • I47.2 - Ventricular tachycardia
FY 2023AddedAdded to the ICD-10-CM code setEffective October 1, 2022.
FY 2024–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About I47.21Overview

Is I47.21 (Ventricular tachycardia) a billable code?

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

What MS-DRG does I47.21 group to?

When torsades de pointes is the principal diagnosis on an inpatient stay, it groups to MS-DRG 308, 309, 310, with relative weights from 0.5661 to 1.2040 depending on complications. Higher weights mean higher Medicare reimbursement.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.