2025 ICD-10-CM Diagnosis Code I44.7

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Left bundle-branch block, unspecified

  • I44.7 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 I44.7 became effective on October 1, 2024.
  • This is the American ICD-10-CM version of I44.7 – other international versions of ICD-10 I44.7 may differ.

ICD-10-CM Coding Rules

  • I44.7 is not usually sufficient justification for admission to an acute care hospital when used a principal diagnosis.

The following code(s) above I44.7 contain annotation back-references

 that may be applicable to I44.7:

  • I00-I99  Diseases of the circulatory system

Approximate Synonyms

  • Left bundle branch block

Clinical Information

  • A cardiac rhythm characterized by qrs duration 120 ms or longer, delayed onset of intrinsicoid deflection in 1, v5, and v6 >60 ms, broad and notched or slurred r waves in i, avl, v5, and v6, rs or qs complexes in right precordial leads, st-segment and t waves in opposite polarity to the major qrs deflection.
  • An impairment of transmission of the cardiac electrical impulse along the fibers of the left main bundle branch, or both the left anterior fascicle and left posterior fascicle. This conduction disturbance is characterized by wide (greater than 0.11s) qrs complexes. The diagnostic criteria consist of prolongation of the qrs complexes (over 0.11s) with neither a q wave nor an s wave in lead v1 and in the “properly placed” v6. A wide r wave with a notch on its top (“plateau”) is seen in these leads. In hearts with an electrical (and anatomic) vertical position a small q wave may be seen in avl in the absence of mi. Right chest lead v1 may or may not show an initial r wave, but the latter should be present in lead v2.
  • An impairment of transmission of the cardiac electrical impulse along the fibers of the left main bundle branch, or both the left anterior fascicle and left posterior fascicle. This conduction disturbance is characterized by wide (greater than 0.11s) qrs complexes. The diagnostic criteria consist of prolongation of the qrs complexes (over 0.11s) with neither a q wave nor an s wave in lead v1 and in the properly placed v6. A wide r wave with a notch on its top (plateau) is seen in these leads. In hearts with an electrical (and anatomic) vertical position a small q wave may be seen in avl in the absence of mi. Right chest lead v1 may or may not show an initial r wave, but the latter should be present in lead v2.

ICD-10-CM I44.7 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

Convert I44.7 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 I44.7:

  • Block, blocked
    • bundle-branch (complete) (false) (incomplete) I45.4
      • left I44.7
        • incomplete I44.7
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