1. I44 Atrioventricular and left bundle-branch block

    1. I44.0 Atrioventricular block, first degree

    2. I44.1 Atrioventricular block, second degree

      Inclusion term(s):

      • Atrioventricular block, type I and II
      • Möbitz block, type I and II
      • Second degree block, type I and II
      • Wenckebach's block
    3. I44.2 Atrioventricular block, complete

      Inclusion term(s):

      • Complete heart block NOS
      • Third degree block
    4. I44.3 Other and unspecified atrioventricular block

      Inclusion term(s):

      • Atrioventricular block NOS
      1. I44.30 Unspecified atrioventricular block

      2. I44.39 Other atrioventricular block

    5. I44.4 Left anterior fascicular block

    6. I44.5 Left posterior fascicular block

    7. I44.6 Other and unspecified fascicular block

      1. I44.60 Unspecified fascicular block

        Inclusion term(s):

        • Left bundle-branch hemiblock NOS
      2. I44.69 Other fascicular block

    8. I44.7 Left bundle-branch block, unspecified

Abbreviations used here:

NEC Not elsewhere classifiable
This abbreviation in the Tabular List represents “other specified”. When a specific code is not available for a condition, the Tabular List includes an NEC entry under a code to identify the code as the “other specified” code.

NOS Not otherwise specified
This abbreviation is the equivalent of unspecified.