1. I48 Atrial fibrillation and flutter

    1. I48.0 Paroxysmal atrial fibrillation

    2. I48.1 Persistent atrial fibrillation

      1. I48.11 Longstanding persistent atrial fibrillation

      2. I48.19 Other persistent atrial fibrillation

        Inclusion term(s):

        • Chronic persistent atrial fibrillation
        • Persistent atrial fibrillation, NOS
    3. I48.2 Chronic atrial fibrillation

      1. I48.20 Chronic atrial fibrillation, unspecified

      2. I48.21 Permanent atrial fibrillation

    4. I48.3 Typical atrial flutter

      Inclusion term(s):

      • Type I atrial flutter
    5. I48.4 Atypical atrial flutter

      Inclusion term(s):

      • Type II atrial flutter
    6. I48.9 Unspecified atrial fibrillation and atrial flutter

      1. I48.91 Unspecified atrial fibrillation

      2. I48.92 Unspecified atrial flutter

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.