ICD 9 CM Conventions
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NEC - NOT ELSEWHERE CLASSIFIABLE
This abbreviation is used when a specific code is not available for a condition.
NOS - NOT OTHERWISE SPECIFIED
This abbreviation is the equivalent of unspecified.
SQUARE BRACKETS [ ]
Brackets enclose synonyms, alterative terminology or explanatory phrases.
EXAMPLE: 482.2 Pneumonia due to Hemophilus Influenzae [H. Influenzae].
PARENTHESES ( )
Parentheses are used to enclose additional words called non-essential modifiers that may be present in the description of a disease or procedure but to do not change the code.
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