Household data are collected as of March. As stated in the Census's Source and Accuracy of Estimates for Income, Poverty, and Health Insurance Coverage in the United States: 2011 (http://www.census.gov/hhes/www/p60_243sa.pdf) Estimation of Median Incomes. The Census Bureau has changed the methodology for computing median income over time.
Coding CAD. The ICD-9-CM diagnosis codes for CAD are classified to subcategory 414.0x. Coding CAD requires documentation of the coronary artery involved and whether or not it is of a native artery, an artery of a transplanted heart, or a bypass graft. The fifth-digit subclassification identifies the coronary artery involved.
ICD-9-CM (International Classification of Diseases, 9th Revision, Clinical Modification) coding system is used to code signs, symptoms, injuries, diseases, and conditions. The critical relationship between an ICD-9 code and a CPT code is that the diagnosis supports the medical necessity of the procedure. Since both ICD-9 and CPT are numeric codes, health care consulting firms, the government, and insurers have all designed software that compares the codes for a logical relationship.