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.
P. Diagnostic Codes. ICD-9-CM is the International Classification of Diseases Codes, 9th Revision, Clinical Modification. Developed and maintained by the World Health Organization, ICD-9-CM codes are used to describe illnesses, injuries and accidents for the purpose of medical research and reporting. The ICD-9-CM system numerically classifies medical diagnosis by a code number, which provides need to use when processing claims.