describes an illness or condition having severe symptoms and a short duration; can also refer to a sudden exacerbation of a chronic condition.
the section of the ICD-9-CM in which diseases and injuries with corresponding diagnosis codes are presented in alphabetic order.
additional illness that either has an effect on the patient's primary illness or is also treated during the encounter.
a single code that classifies both the etiology and the manifestation of an illness or injury.
typographic techniques or standard practices that provide visual guidelines for understanding printed material.
a comparison or map of the codes for the same or similar classifications under two coding systems that provides a guide for selecting the closest match.
a physicians description of the main reason for a patient's encounter; may also describe related conditions or symptoms.
a name or phrase that is formed from or based on a person's name; usually describes a condition or procedure associated with that person.
abbreviated title of International Classification of Diseases, 9th Revision, Clinical Modification.
the word in bold faced type that identifies a disease or condition in the Alphabetic index in ICD-9-CM.
Not Elsewhere Classified (NEC)
an ICD-9-CM abbreviation indicating the code to be used when an illness or condition cannot be placed in any other category.
Not Otherwise Specified (NOS)
an ICD-9-CM abbreviation indicating the code to be used when no information is available for assigning the illness or condition to a more specific code.
a diagnosis that represents the patient's major illness or condition for the encounter.
a nonessential word or phrase that helps to define a code in the ICD-9-CM; usually enclosed in parentheses or brackets.