I45.81 Long QT syndrome

Billable ICD-10-CM code, FY2026.

MS-DRG index

Defines the logic of DRG(s) 308-310 in MDC 05.

Approximate ICD-9-CM (GEMs)

• 426.82 Long QT syndrome

Code annotations containing back-references to I45.81

Back-references to I45.81

• Code Also: I47.21 Torsades de pointes (", if applicable, long QT syndrome (I45.81)")
• Type 1 Excludes: R94.31 Abnormal electrocardiogram [ECG] [EKG] ("long QT syndrome (I45.81)")

Diagnosis Index entries for I45.81

• Jervell-Lange-Nielsen syndrome
• Long › QT syndrome
• Romano-Ward (prolonged QT interval) syndrome
• Syndrome › Jervell-Lange-Nielsen
• Syndrome › long QT
• Syndrome › QT interval prolongation
• Syndrome › Romano-Ward (prolonged QT interval)

Nearby codes

• I45.3 Trifascicular block
• I45.4 Nonspecific intraventricular block
• I45.5 Other specified heart block
• I45.6 Pre-excitation syndrome
• I45.8 Other specified conduction disorders
• I45.81 Long QT syndrome (this code)
• I45.89 Other specified conduction disorders
• I45.9 Conduction disorder, unspecified