A very simple plotting with data from wikipedia and rudimentary extrapolation, shows that more than 1.1 billion Indian's annual income is less than the current cost of heart surgery. India's total population is 1.2 billion.
Medical tourism, though very fine for a lot of folks who want a cheaper alternative, is driving up the cost of medical treatments in India by leaps and bounds. This makes surgeries, that were already very expensive and out of the reach of most Indian's even more expensive and out of the reach of even more people.
Sources: http://en.wikipedia.org/wiki/Income_in_India http://en.wikipedia.org/wiki/Poverty_in_India Simpel graph of the poverty data : http://imgur.com/JngiK8W (I used this to find the number of people with an annual income less than 1583 USD)