I47.21 – Torsades de pointes

ICD-10-CM 2027 diagnosis code · Other forms of heart disease

Billable code

ICD-10-CM code I47.21

Code: I47.21 (claims format: I4721)
Description: Torsades de pointes
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 9. Diseases of the circulatory system (I00-I99)
Block: I30-I5A Other forms of heart disease
Parent codes: I47 › I47.2

Notes for I47.21

Use additional code:

code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

Code also:

, if applicable, long QT syndrome (I45.81)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

I47 – Paroxysmal tachycardia

Excludes1 (not coded here):

tachycardia NOS (R00.0)
sinoauricular tachycardia NOS (R00.0)
sinus [sinusal] tachycardia NOS (R00.0)

Code first:

tachycardia complicating:
abortion or ectopic or molar pregnancy (O00-O07, O08.8)
obstetric surgery and procedures (O75.4)

Index terms for I47.21

Entries in the ICD-10-CM alphabetic index that lead to this code:

Torsades de pointes

Related codes in I47.2

Frequently asked questions

What is ICD-10 code I47.21?

I47.21 is the ICD-10-CM code for torsades de pointes, in the block I30-I5A (Other forms of heart disease).

Is I47.21 a billable code?

Yes. I47.21 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does I47.21 belong to?

It belongs to category I47 – Paroxysmal tachycardia.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.