1. B99 Other and unspecified infectious diseases

    1. B99.8 Other infectious disease

    2. B99.9 Unspecified infectious disease

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.