What is the ICD-10 code for prolonged QT?

The ICD-10 code for confirmed Long QT syndrome is I45.81. Use R94.31 for QT prolongation without confirmed syndrome.

How do you code drug-induced QT prolongation?

For drug-induced QT prolongation, use R94.31 along with the appropriate drug adverse effect code.

ICD-10 Coding for Prolonged QT Interval(I45.81, I45.8, Q87.89)

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Learn about the ICD-10 coding for prolonged QT interval, including Long QT syndrome. Understand documentation requirements and coding pitfalls.

Also known as:

Long QT SyndromeLQTSQT Prolongation

Related ICD-10 Code Ranges

Complete code families applicable to Prolonged QT Interval

I00-I99Primary Range

Diseases of the circulatory system

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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 Long QT syndrome is confirmed by clinical or genetic testing.	QTc interval ≥480 ms in adults or ≥460 ms in children Genetic testing confirming LQTS Family history of sudden cardiac death
R94.31	Abnormal electrocardiogram [ECG] [EKG]	Use when QT prolongation is observed without a confirmed diagnosis of LQTS.	QTc interval noted on ECG without other clinical confirmation of LQTS

Primary ICD-10-CM Codes

Long QT syndrome

I45.81Billable

Differential Codes

Alternative codes to consider when ruling out similar conditions

Abnormal ECGR94.31

Long QT syndromeI45.81

Documentation & Coding Risks

Avoid these common issues when documenting Prolonged QT Interval.

Omitting Q87.89 for congenital LQTS.

Impact

Clinical: Inaccurate representation of congenital conditions., Regulatory: Potential audit flags for incomplete coding., Financial: May affect reimbursement rates.

Mitigation

Always pair I45.81 with Q87.89 for congenital cases.

Confusing drug-induced QT prolongation with LQTS.

Impact

Reimbursement: Incorrect coding can lead to improper DRG assignment., Compliance: May result in audit discrepancies., Data Quality: Affects accuracy of patient records.

Mitigation

Use R94.31 with appropriate drug adverse effect code.

Incorrect Code Pairing

Impact

Using I45.81 with R94.31.

Mitigation

Educate coders on Excludes1 notes and proper code usage.

Frequently Asked Questions

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

Primary Code

I45.81

Long QT syndrome

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ICD-10 codes4

Coding risks3

FAQs2

ICD-10 Coding for Prolonged QT Interval(I45.81, I45.8, Q87.89)

Documentation & Coding Risks

Frequently Asked Questions

What is the ICD-10 code for prolonged QT?

How do you code drug-induced QT prolongation?

Related condition guides