I45.3 Trifascicular block

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 426.54 Trifascicular block

Diagnosis Index entries for I45.3

• Block, blocked › trifascicular

Nearby codes

• I45.0 Right fascicular block
• I45.1 Other and unspecified right bundle-branch block
• I45.10 Unspecified right bundle-branch block
• I45.19 Other right bundle-branch block
• I45.2 Bifascicular block
• I45.3 Trifascicular block (this code)
• 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