What is the ICD-10 code for QT prolongation?

The ICD-10 code for confirmed Long QT Syndrome is I45.81, while R94.31 is used for incidental QT prolongation findings.

When should I use R94.31 instead of I45.81?

Use R94.31 for incidental findings of QT prolongation without a confirmed diagnosis of Long QT Syndrome.

ICD-10 Coding for QT Prolongation(I45.81, I45.8, R94.31)

Save

Learn about ICD-10 coding for QT prolongation, including Long QT Syndrome (I45.81) and incidental findings (R94.31).

Also known as:

Long QT SyndromeLQTSProlonged QT Interval

Related ICD-10 Code Ranges

Complete code families applicable to QT Prolongation

I00-I99Primary Range

Diseases of the circulatory system

→

Code Comparison: When to Use Each Code

Compare key differences between these codes to ensure accurate selection

Code	Description	When to Use	Key Documentation
I45.81	Long QT syndrome	Use when there is a confirmed diagnosis of Long QT Syndrome, either congenital or acquired.	QTc ≥480 ms without symptoms QTc ≥460 ms with symptoms Genetic confirmation of LQTS
R94.31	Abnormal electrocardiogram [ECG] - QT interval prolongation	Use for incidental findings of QT prolongation without a confirmed diagnosis of LQTS.	QTc measurement showing prolongation without meeting LQTS criteria

Primary ICD-10-CM Codes

Long QT syndrome

I45.81Billable

Differential Codes

Alternative codes to consider when ruling out similar conditions

Abnormal electrocardiogram [ECG] - QT interval prolongationR94.31

Long QT syndromeI45.81

Documentation & Coding Risks

Avoid these common issues when documenting QT Prolongation.

Failing to document QTc measurement method.

Impact

Clinical: May lead to misinterpretation of ECG findings., Regulatory: Could result in coding audits., Financial: Potential for denied claims due to insufficient documentation.

Mitigation

Always include QTc measurement method in documentation.

Using R94.31 alone for confirmed LQTS

Impact

Reimbursement: Incorrect coding may lead to underpayment., Compliance: May result in coding audits and compliance issues., Data Quality: Affects the accuracy of patient records and data reporting.

Mitigation

Use I45.81 for confirmed LQTS and R94.31 for incidental findings.

QTc Documentation

Impact

Failure to document QTc measurement method can lead to audit findings.

Mitigation

Ensure all ECG reports include QTc value and method.

Frequently Asked Questions

Documentation requirements, coding pitfalls and FAQs for conditions coded with I45.81.

Primary Code

I45.81

Long QT syndrome

Quick Navigation

ICD-10 codes4

Coding risks3

FAQs2

ICD-10 Coding for QT Prolongation(I45.81, I45.8, R94.31)

Documentation & Coding Risks

Frequently Asked Questions

What is the ICD-10 code for QT prolongation?

When should I use R94.31 instead of I45.81?

Related condition guides