Terminology varies considerably across sources cited in the Incidence and Prevalence Database (IPD). Below are some general terms you may encounter while browsing the database. There is also a Remarks section for individual ICD-9 codes, containing definitions specific to each disease or procedure along with other useful notes. The Remarks section appears under Overview Reports on the Search Results page.

Activities of Daily LivingAmbulatory Clinic

Ambulant

Baseline

Community Hospitals

Comorbidity

Cost (Indirect Cost, Direct Cost)

Current Procedural Terminology (CPT) Codes

Disposition

Emergency Department

Emergency Service Area

Epidemiology

Etiology

Hazard Rate

Health maintenance organization (HMO)

Histology

Hospice

ICD-9-CM (International Classification of Diseases, 9th Revision, Clinical Modification)

Incidence

Length of Stay

Mean, Median, and Mode

Medicaid

Medicare

Mendelian Inheritance in Men (MIM) Number

Morbidity

Mortality

Outcome

Outpatient Department

Pathophysiology

Person-Years

Prevalence

REF Codes

Risk Factors

Relative Risk (Risk Ratio)

Short-term Hospitals

Standardized Incidence Ratio

V Codes

Visit

Designed for the universal classification of morbidity and mortality information for statistical purposes, and for the indexing of records by disease and operations (surgical, diagnostic, and therapeutic procedures). ICD Codes with three digits before the decimal refer to disease diagnoses, while those with two digits before the decimal refer to procedures. The number of digits after the decimal (none, one, or two) indicates the degree of specificity of the disease or procedure classification. For example, two digits following the decimal indicate a highly specific description (493.00 = Extrinsic asthma without mention of status asthmaticus); one digit is somewhat more general (493.0 = Extrinsic asthma); and no digits are used for the most general classifications (493. = Asthma). Note that codes containing a "9" immediately after the decimal tend to refer to "other and unspecified" categories within the more general classification (e.g., 493.9 = Asthma, unspecified). IMPORTANT: Statistical trend data (i.e. hospital inpatient, physician office visits, etc.) from the more specific codes are incorporated into the data for the more general codes; therefore, codes with one (or two) digits after the decimal should not be added to codes with none (or one) following the decimal. For example, statistics reported for 493. include data from 493.0, 493.2, and 493.9; likewise, 493.0 includes data from 493.00 and 493.01, and so on.