official updates to ICD-9-CM published continuously since 1986, that become effective on October 1st of each year.
The section of the ICD-9-CM in which diseases and injuries with corresponding diagnosis codes are presented in alphabetical order.
a physician's description of the main reason for a patients encounter; may also describe related conditions or symptoms.
The word in bold-faced type that identifies a disease or condition in the Alphabetic index in ICD-9-CM
A nonessential word or phrase that helps to define a code in the ICD-9-CM; usually enclosed in parentheses or brackets.
NOS (not otherwise specified)
indicating the code to be used when no information is available for assigning the illness or condition a more specific 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.
an undesired and potentially harmful effect occuring at normal therapeutic dosing levels
Table of Drugs and Chemicals
reference listing of drugs and chemicals in the ICD-9-CM Alphabetic Index.
chief complaint (CC)
A patient's description of the symptoms or other reasons for seeking medical care for a provider encounter.
a diagnosis that represents the patient's major illness or condition for an encounter
Additional illness that either has an effect on the patient's primary illness or is also treated during the encounter.
ICD-9-CM Official Guidelines for coding and Reporting
American Hospital Association publication that provides rules for selecting and sequencing diagnosis codes correctly in both the impatient and outpatient environments.