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dx=dx7;
run;
data
nis.dx8;
set nis.chf;
dx=dx8;
run;
data
nis.dx9;
set nis.chf;
dx=dx9;
run;
data
nis.dx10;
set nis.chf;
dx=dx10;
run;
data
nis.dx11;
set nis.chf;
dx=dx11;
run;
data
nis.dx12;
set nis.chf;
dx=dx12;
run;
data
nis.dx13;
set nis.chf;
dx=dx13;
run;
data
nis.dx14;
set nis.chf;
dx=dx14;
run;
data
nis.dx15;
set nis.chf;
dx=dx15;
run;
data
nis.dxforchf;
set nis.dx2 nis.dx3 nis.dx4 nis.dx5 nis.dx6 nis.dx7 nis.dx8 nis.dx9
nis.dx10 nis.dx11 nis.dx12 nis.dx13 nis.dx14 nis.dx15;
run;
The most frequent secondary diagnoses include 428 (congestive heart failure), 401.9 (essential hy-
pertension), 427 (Cardiac dysrhythmias), 496 (Chronic airway obstruction, not elsewhere classified),
and 427.31 (Atrial fibrillation). All but the code 496 are directly related to the primary diagnosis of
congestive heart failure. According to the documentation, these codes are discarded and not considered
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