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 Codes 401 for Essential ypertension ICD 9 codes for Essential hypertension 401.0, 401.1, 401.9. ICD 9 Codes 402 for Hypertensive Heart Disease ICD 9 codes for Hypertensive heart disease 402.00, 402.01, 402.10, 402.11, 402.90, 402.91.