I45.0 Right fascicular block

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)

• 426.4 Right bundle branch block (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Questionable admission: Some diagnoses are not usually sufficient justification for admission to an acute care hospital when reported as principal diagnosis.

Diagnosis Index entries for I45.0

• Block, blocked › fascicular (left) › right

Nearby codes

• I45 Other conduction disorders
• I45.0 Right fascicular block (this code)
• 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