I don't know where you are getting this fiugure from, I presume it is from Table 9.1 page 45
Here is the info
65-69 years both sexes 68,138
70-74 years both sexes 119,474
over 75 years both sexes 216,729
Total of 404341
If you look at over 70's we have a total of 336203
From CSO.ie 252,729 over 70's were included in the census see
here
That means the HSE paid for 83,474 more over 70's in 2006 than were included in the census. Thats about a 30% error.
To put in context, there were 27,479 deaths in Ireland in 2006 see
here
19,848 of which were over 65.
If we take an
average capitation figure of €150 per patient, 80,000 patients or so.
Thats €12.5 million spent on patients the CSO did not think existed.