1. R51 Headache

    1. R51.0 Headache with orthostatic component, not elsewhere classified

      Inclusion term(s):

      • Headache with positional component, not elsewhere classified
    2. R51.9 Headache, unspecified

      Inclusion term(s):

      • Facial pain NOS
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.