I47.21

I47.21: Torsades de pointes

Billable / specific codeICD-10-CM

I47.21 is a billable, specific ICD-10-CM code for torsades de pointes. It is valid for submission on a claim.

Check I47.21 with the rest of the claim: free scrubber

Use additional code

Add a secondary code to capture the detail described below.

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

Code also

Both codes may be needed to describe the encounter fully. Sequencing depends on the reason for the visit.

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

Excludes1 inherited from the categories above I47.21

A category’s note binds every code beneath it.

Written on I47: Paroxysmal tachycardia

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

Other codes that can never be billed with I47.21

Their own Excludes1 notes name this code, so the conflict is not listed above.

R00.0Tachycardia, unspecified

Risk adjustment

I47.21 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 238 Specified Heart Arrhythmias0.299 RAF

Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score. Look up the whole chart to see which of its HCCs the hierarchy would zero.

Medicare coverage

I47.21 is named in 34 Medicare coverage policies: 34 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

A52423Billing and Coding: Infliximab and biosimilars
A52458Automatic External Defibrillators - Policy Article
A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
A54799Billing and Coding: Urine Drug Testing

Alphabetic index entries that lead here

Torsades de pointes

Code history

Unchanged in every release from FY2024 to FY2027.