Should I get integrated shield plan for my parents who are Long Term Visit Pass (LTVP) holder? They are 64 years old. Is there any other option other than shield plan? It costs 2-3k SGD annually for private hospital plan with no rider for foreigner?

Yes, if you could afford it. Do explore all options available before committing.

I am a broker and I have covered for foreigners in Singapore with private medical insurance with full private hospital coverage too - some of these insurers are actually a lot more reputable than our local insurers around the world. These plans are easily portable wherever you go, ensuring they get the extensive coverage that they require.