1. ICD-10-CM Codes
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2. I00-I99
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3. I30-I5A
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4. I44-
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5. 2023 ICD-10-CM Diagnosis Code I44.5

2023 ICD-10-CM Diagnosis Code I44.5

Left posterior fascicular block

2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code Questionable As Admission Dx

• I44.5 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2023 edition of ICD-10-CM I44.5 became effective on October 1, 2022.
• This is the American ICD-10-CM version of I44.5 - other international versions of ICD-10 I44.5 may differ.

• I44.5 is not usually sufficient justification for admission to an acute care hospital when used a principal diagnosis.

• Left posterial fascicular hemiblock (heart rhythm)
• Left posterior hemiblock

• An impairment of transmission of the cardiac electrical impulse along the fibers of the left posterior fascicle. In pure left posterior fascicular block (lpfb), the impulse emerges from the unblocked anterosuperior division, thus producing small q waves in leads ii, iii, and avf. Thereafter, the impulse moves through the electrically predominant left ventricle in an inferior and rightward direction, thus explaining the s waves in leads i and avl as well as the r waves in leads ii, iii, and avf.
• An impairment of transmission of the cardiac electrical impulse along the fibers of the left posterior fascicle. In pure left posterior fascicular block (lpfb), the impulse emerges from the unblocked anterosuperior division, thus producing small q waves in leads ii, iii, and avf. Thereafter, the impulse moves through the electrically predominant left ventricle in an inferior and rightward direction, thus explaining the s waves in leads i and avl as well as the r waves in leads ii, iii, and avf. Left posterior fascicular block is characterized by all of the following: right-axis deviation with frontal qrs axis between +90 degrees and +180 degrees; rs in leads i and avl and qr in inferior leads (q waves 40 ms) qrs duration <120 ms.

• 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 I44.5 to ICD-9-CM

• 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

• Block, blocked
  • bundle-branch (complete) (false) (incomplete) I45.4
    ICD-10-CM Diagnosis Code I45.4

    Nonspecific intraventricular block

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

    Applicable To

    • Bundle-branch block NOS
    • left I44.7
      ICD-10-CM Diagnosis Code I44.7

      Left bundle-branch block, unspecified

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code Questionable As Admission Dx
      • hemiblock I44.60
        ICD-10-CM Diagnosis Code I44.60

        Unspecified fascicular block

        2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code Questionable As Admission Dx

        Applicable To

        • Left bundle-branch hemiblock NOS
        • posterior I44.5
  • fascicular (left) I44.60
    ICD-10-CM Diagnosis Code I44.60

    Unspecified fascicular block

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code Questionable As Admission Dx

    Applicable To

    • Left bundle-branch hemiblock NOS
    • posterior I44.5

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.