2025 ICD-10-CM Diagnosis Code I45.2

Bifascicular block

• I45.2 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2025 edition of ICD-10-CM I45.2 became effective on October 1, 2024.
• This is the American ICD-10-CM version of I45.2 – other international versions of ICD-10 I45.2 may differ.

The following code(s) above I45.2 contain annotation back-references

 that may be applicable to I45.2:

• I00-I99  Diseases of the circulatory system

Approximate Synonyms

• Bilateral bundle branch block
• Bilateral bundle branch block (heart rhythm condition)
• Heart block
• Right bundle branch block and left anterior fascicular
• Right bundle branch block and left anterior fascicular block
• Right bundle branch block and left posterior fascicular block

Clinical Information

• An electrocardiographic finding comprising right bundle branch block and left anterior fascicular block, or right bundle branch block and left posterior fascicular block. Defects occuring in two of the three divisions of the conduction system of the heart are considered bifascicular blocks. Technically left bundle branch block may be considered a bifascicular block.

ICD-10-CM I45.2 is grouped within Diagnostic Related Group(s) (MS-DRG v42.0):

• 308 Cardiac arrhythmia and conduction disorders with mcc
• 309 Cardiac arrhythmia and conduction disorders with cc
• 310 Cardiac arrhythmia and conduction disorders without cc/mcc
• 791 Prematurity with major problems
• 793 Full term neonate with major problems

Convert I45.2 to ICD-9-CMCode History

• 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
• 2017 (effective 10/1/2016): No change
• 2018 (effective 10/1/2017): No change
• 2019 (effective 10/1/2018): No change
• 2020 (effective 10/1/2019): No change
• 2021 (effective 10/1/2020): No change
• 2022 (effective 10/1/2021): No change
• 2023 (effective 10/1/2022): No change
• 2024 (effective 10/1/2023): No change
• 2025 (effective 10/1/2024): No change

Diagnosis Index entries containing back-references to I45.2:

• Block, blocked
  • bundle-branch (complete) (false) (incomplete) I45.4
    • leftI44.7
      • incompleteI44.7
        • with right bundle branch block I45.2
      • with right bundle branch block I45.2
    • rightI45.10
      • with
        • left bundle branch block I45.2
        • left fascicular block I45.2
    • bilateral I45.2
  • intraventricular (nonspecific) I45.4
    • bundle branch
      • bilateral I45.2
  • heartI45.9
    • bundle branchI45.4
      • bilateral I45.2
  • bifascicular I45.2 (cardiac)