Home > 2015 ICD-9-CM Diagnosis Codes > Diseases Of The Circulatory System 390-459 > Other Forms Of Heart Disease 420-429 > Conduction disorders 426-
Specific code 2015 ICD-9-CM Diagnosis Code 426.2
Left bundle branch hemiblock
  • 2015
  • Billable Thru Sept 30/2015
  • Non-Billable On/After Oct 1/2015
  • Questionable As Admission Dx

  • ICD-9-CM 426.2 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 426.2 should only be used for claims with a date of service on or before September 30, 2015. For claims with a date of service on or after October 1, 2015, use an equivalent ICD-10-CM code (or codes).
Convert to ICD-10-CM: 426.2 converts approximately to:
  • 2015/16 ICD-10-CM I44.4 Left anterior fascicular block
    Or:
  • 2015/16 ICD-10-CM I44.5 Left posterior fascicular block
    Or:
  • 2015/16 ICD-10-CM I44.60 Unspecified fascicular block
    Or:
  • 2015/16 ICD-10-CM I44.69 Other fascicular block
Approximate Synonyms
  • Left anterior fascicular hemiblock
  • Left anterior fascicular hemiblock (heart rhythm)
  • Left anterior hemiblock
  • Left posterial fascicular hemiblock
  • Left posterial fascicular hemiblock (heart rhythm)
  • Left posterior fascicular hemiblock
  • Left posterior hemiblock
Clinical Information
  • An impairment of transmission of the cardiac electrical impulse along the fibers of the left anterior fascicle. In left anterior fascicular block (lafb) the posteroinferior regions of the left ventricular endocardium are activated abnormally before the anterosuperior left ventricular area. After emerging from the posteroinferior division of the left bundle branch, the impulse first propagates in an inferior, rightward, and usually anterior direction for a short period of time. This orientation is responsible for the small q waves in leads 1 and avl and for the r waves in leads ii, iii, and avf. (nci)
  • An impairment of transmission of the cardiac electrical impulse along the fibers of the left anterior fascicle. In left anterior fascicular block (lafb) the posteroinferior regions of the left ventricular endocardium are activated abnormally before the anterosuperior left ventricular area. After emerging from the posteroinferior division of the left bundle branch, the impulse first propagates in an inferior, rightward, and usually anterior direction for a short period of time. This orientation is responsible for the small q waves in leads i and avl and for 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
  • 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. (nci)
Applies To
  • Block:
    • left anterior fascicular
    • left posterior fascicular
ICD-9-CM Coding Information
  • 426.2 is not usually sufficient justification for admission to an acute care hospital when used a principal diagnosis.
ICD-9-CM Volume 2 Index entries containing back-references to 426.2:
  • Block
    • bundle branch (complete) (false) (incomplete) 426.50
      • bilateral 426.53
      • left (complete) (main stem) 426.3
        • with right bundle branch block 426.53
        • anterior fascicular 426.2
          • with
            • posterior fascicular block 426.3
            • right bundle branch block 426.52
        • hemiblock 426.2
        • incomplete 426.2
          • with right bundle branch block 426.53
        • posterior fascicular 426.2
          • with
            • anterior fascicular block 426.3
            • right bundle branch block 426.51
      • right 426.4
      • Wilson's type 426.4
    • fascicular (left anterior) (left posterior) 426.2
  • Bundle
    • branch block (complete) (false) (incomplete) 426.50
      • bilateral 426.53
      • left (see also Block, bundle branch, left) 426.3
        • hemiblock 426.2
      • right (see also Block, bundle branch, right) 426.4
  • Hemiblock (cardiac) (heart) (left) 426.2
 426.13 ICD9Data.com 426.3 
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 426.2 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2015 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.
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