I47.21 — Torsades de pointes
I47.21 is a billable, specific ICD-10-CM code for torsades de pointes. It is valid for submission on a claim.
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Add a secondary code to capture the detail described below.
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)
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.
Medicare coverage
I47.21 is named in 46 Medicare coverage policies — 46 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
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- A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
How I47.21 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to I47.21.
- Torsades de pointes
Related codes at this level
Codes that share I47.2. If I47.21 is not quite right, the correct code is usually one of these.
Questions about I47.21
- Is I47.21 a billable ICD-10-CM code?
- Yes. I47.21 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does I47.21 sit in the tabular list?
- Diseases of the circulatory system (I00-I99), in the block Other forms of heart disease (I30-I5A).