Specific code 2014 ICD-9-CM Diagnosis Code 426.4
Right bundle branch block
  • Billable Code
  • Questionable As Admission Dx
  • Short description: Rt bundle branch block.
  • ICD-9-CM 426.4 will be replaced by an equivalent ICD-10-CM code (or codes) when the United States transitions from ICD-9-CM to ICD-10-CM on October 1, 2015.
  • ICD-9-CM 426.4 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
Disease Synonyms
  • RIGHT BUNDLE BRANCH BLOCK
Clinical Information
  • A cardiac rhythm characterized by a qrs duration of 120 ms, rsr' or rsr' complexes in v1 and v2, delayed onset of intrinsicoid, deflection in v1 and v2 >50 ms, broad, slurred s wave in 1, v5, and v6.
  • An impairment of transmission of the cardiac electrical impulse along the fibers of the right bundle branch. A " complete rbbb pattern" (with qrs duration > 0.11s) does not necessarily reflect the existence of a total conduction block in the right branch. This pattern only indicates that the entire or major parts of both ventricles are activated by the impulse emerging from the left branch. Thus, a significant degree of conduction delay ("high-grade" or "incomplete rbbb") can produce a similar pattern.
  • An impairment of transmission of the cardiac electrical impulse along the fibers of the right bundle branch. A "complete rbbb pattern" (with qrs duration > 0.11s) does not necessarily reflect the existence of a total conduction block in the right branch. This pattern only indicates that the entire or major parts of both ventricles are activated by the impulse emerging from the left branch. Thus, a significant degree of conduction delay ("high-grade" or "incomplete rbbb") can produce a similar pattern.
  • An impairment of transmission of the cardiac electrical impulse along the fibers of the right bundle branch. A "complete rbbb pattern" (with qrs duration > 0.11s) does not necessarily reflect the existence of a total conduction block in the right branch. This pattern only indicates that the entire or major parts of both ventricles are activated by the impulse emerging from the left branch. Thus, a significant degree of conduction delay ("high-grade" or "incomplete rbbb") can produce a similar pattern. (nci)
ICD-9-CM Coding Information
  • 426.4 is not usually sufficient justification for admission to an acute care hospital when used a principal diagnosis.
Convert to ICD-10-CM: 426.4 converts approximately to:
  • 2014 ICD-10-CM I45.10 Unspecified right bundle-branch block
ICD-9-CM Volume 2 Index entries containing back-references to 426.4:
  • 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
    • heart 426.9
      • first degree (atrioventricular) 426.11
      • second degree (atrioventricular) 426.13
      • third degree (atrioventricular) 426.0
      • bundle branch (complete) (false) (incomplete) 426.50
        • bilateral 426.53
        • left (see also Block, bundle branch, left) 426.3
        • right (see also Block, bundle branch, right) 426.4
      • complete (atrioventricular) 426.0
      • congenital 746.86
      • incomplete 426.13
      • intra-atrial 426.6
      • intraventricular NEC 426.6
      • sinoatrial 426.6
      • specified type NEC 426.6
    • intraventricular (diffuse) (myofibrillar) 426.6
      • bundle branch (complete) (false) (incomplete) 426.50
        • bilateral 426.53
        • left (see also Block, bundle branch, left) 426.3
        • right (see also Block, bundle branch, right) 426.4
  • Bundle
    • branch block (complete) (false) (incomplete) 426.50
      • bilateral 426.53
      • left (see also Block, bundle branch, left) 426.3
      • right (see also Block, bundle branch, right) 426.4
  • Degeneration, degenerative
  • Sclerosis, sclerotic
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 426.4 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 2014 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.