2021 ICD-10-CM Diagnosis Code I44.7

Left bundle-branch block, unspecified

    2016 2017 2018 2019 2020 2021 Billable/Specific Code Questionable As Admission Dx
  • I44.7 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2021 edition of ICD-10-CM I44.7 became effective on October 1, 2020.
  • 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
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to I44.7:
  • I00-I99
    2021 ICD-10-CM Range I00-I99

    Diseases of the circulatory system

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    • systemic connective tissue disorders (M30-M36)
    • transient cerebral ischemic attacks and related syndromes (G45.-)
    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 v38.0):
  • 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-CM

Code 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

Diagnosis Index entries containing back-references to I44.7:
  • 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 Billable/Specific Code
      Applicable To
      • Bundle-branch block NOS

ICD-10-CM Codes Adjacent To I44.7
I44.1 Atrioventricular block, second degree
I44.2 Atrioventricular block, complete
I44.3 Other and unspecified atrioventricular block
I44.30 Unspecified atrioventricular block
I44.39 Other atrioventricular block
I44.4 Left anterior fascicular block
I44.5 Left posterior fascicular block
I44.6 Other and unspecified fascicular block
I44.60 Unspecified fascicular block
I44.69 Other fascicular block
I44.7 Left bundle-branch block, unspecified
I45 Other conduction disorders
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
I45.4 Nonspecific intraventricular block
I45.5 Other specified heart block
I45.6 Pre-excitation syndrome

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