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describes an illness or condition having severe symptoms and a short duration; can also refer to a sudden exacerbation of a chronic condition.


updates to the ICD-9-CM diagnostic coding system.

Adverse Effect

condition due to the correct usage of a drug

Alphabetic Index

the section of the ICD-9-CM in which diseases and injuries with corresponding diagnosis codes are presented in alphabetic order.


in the ICD-9-CM, a three-digit code used to classify a particular disease or injury.


an illness or condition with a long duration

Coexisting Condition

additional illness that either has an effect on the patient's primary illness or is also treated during the encounter.

Combination Code

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.

Diagnostic Statement

a physicians description of the main reason for a patient's encounter; may also describe related conditions or symptoms.

E Code

an alphanumeric ICD code for an external cause of injury or poisoning.


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.


the cause or origin of a disease


abbreviated title of International Classification of Diseases, 9th Revision, Clinical Modification.

Late Effect

condition that remains after an acute illness or injury has completed its course.

Main Term

the word in bold faced type that identifies a disease or condition in the Alphabetic index in ICD-9-CM.


a characteristic sign or symptom of a disease

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.

Primary Diagnosis

a diagnosis that represents the patient's major illness or condition for the encounter.


an ICD-9-CM, a four-digit code number


an ICD-9-CM, a five-digit code number


a word or phrase that describes a main term in the Alphabetic Index of the ICD-9-CM.

Supplementary Term

a nonessential word or phrase that helps to define a code in the ICD-9-CM; usually enclosed in parentheses or brackets.

Tabular List

the section of the ICD-9-CM in which diagnosis codes are presented in numerical order.


an incompletely described condition which must be coded with an unspecified ICD code.

V Code

an alphanumeric code in the ICD-9-CM that identifies factors that influence health status and encounters that are not due to illness or injury.

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