1. I46 Cardiac arrest

    Excludes2

    • cardiogenic shock (R57.0)
    1. I46.2 Cardiac arrest due to underlying cardiac condition

    2. I46.8 Cardiac arrest due to other underlying condition

    3. I46.9 Cardiac arrest, cause 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.