Method of payment - collapsed
[derived from the Demography form from the PAYMENT_METHOD variable]
(numeric, code table).
NOTE:  Collapsed as follows:
if PAYMENT_METHOD in("PRIVATE INSURANCE","OTHER","MEDICARE AND PRIVATE
INSURANCE") then insurance_collapse=1;
else if PAYMENT_METHOD in("MEDICARE","MEDICAID AND MEDICARE","MILITARY SPONSORED (INCLUDING CHAMPUS &TRICARE)","VETERANS SPONSORED")
then insurance_collapse=2;
else if PAYMENT_METHOD in("MEDICAID","NO MEANS OF PAYMENT (NO INSURANCE)","SELF PAY
(NO INSURANCE)","Unknown") then insurance_collapse=3;