2026 ICD-10-CM Diagnosis Code I47.9Paroxysmal tachycardia, unspecified

ICD-10-CM Codes›I00–I99›I30-I5A›I47

ICD-10-CM I47.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I47.9 is a billable ICD-10-CM diagnosis code for paroxysmal tachycardia, unspecified. 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 incisional tachycardia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cardiac dysrhythmias.

This medical diagnosis code is frequently used in Cardiology medical specialties to designate conditions such abnormalities of heart rhythm.

Code Identity

ICD-10-CM Code
I47.9
Billable Status
Yes — Valid for Submission
Code Describes
Paroxysmal tachycardia, unspecified
Short Description
Paroxysmal tachycardia, unspecified
Same as the full description in the CMS dataset.
Parent Code
I47
Paroxysmal tachycardia

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI30-I5AOther forms of heart disease
CategoryI47Paroxysmal tachycardia
This CodeI47.9Paroxysmal tachycardia, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Incisional tachycardia
  • Paroxysmal tachycardia

Tabular List NotesGuidance

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

Inclusion Terms

  • Bouveret (-Hoffman) syndrome

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.

    • Bouveret(-Hoffmann) syndrome (paroxysmal tachycardia)
    • Disease, diseased
      • Bouveret (-Hoffmann) (paroxysmal tachycardia)
    • Hoffmann-Bouveret syndrome
    • Syndrome
      • Bouveret (-Hoffman)
    • Tachycardia
      • paroxysmal (sustained) (nonsustained)

Clinical ClassificationClinical

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

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

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.

Convert I47.9 to ICD-9-CMHistory

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

ICD-9-CM
427.2 Parox tachycardia 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 I47.9Overview

Is I47.9 (Paroxysmal tachycardia) a billable code?

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

What MS-DRG does I47.9 group to?

When paroxysmal tachycardia, unspecified 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.

What is the ICD-9 equivalent of I47.9?

Under the General Equivalence Mappings, paroxysmal tachycardia, unspecified converts to ICD-9-CM 427.2 (parox tachycardia 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.