Price of visitors insurance plans are fixed ,it does not matter which insurance comparision website you choose to buy from. The price of visitor insurance plan will be always be same.The difference lies in customer service you get . It all matters what kind of coverage you select , less coverage is cheaper and higher coverage would cost you more , but the prices for that set of coverage would always be same everywhere.

These are the most popular and recommended plans for parents visiting USA , these are best for visiting parents because they are comprehensive plans and provice excellent onset of pre-exisiting condition have lowest cost for the coverages you get:

• ATLAS_AMERICA
• PATRIOT_AMERICA
• LIAISON_CONTINENT_A

Yes you can buy visitor insurnace online , here is the checklist to purchase visitors insurance , some plans may require require passport number and some does not , for example IMG .

• Date of birth of the person to be insured
• Passport of the person to be insured

Yes you can purchase visitor health insurance for parents after arriving in USA , But that is a huge risk, if visitor got sick and then you want to buy insurance, then sickenss won't be coverd by the insurance plan.

There is no general rule for deductible and maximum coverage.It depends upon persons to person how much coverage you want .If you think your parents have very little chance of getting sick you may choose higher deductible and lower maximum coverage to reduce premium . But its always recommended to make sure to have comprhensive plans these visitors insurance plans and proper coverage to protect you in-case of medical emergency .

No , visitors health insurance is only for visitors visiting USA for short duration . If you are visiting USA on Greencard , Business Visa, Student Visa or Tourist Visa then YES you are qualified to purchase visitors insurance.

Visitor Insurance plans in India may be cheaper generally because they provide lower coverage. Mostly these travel health insurance plans are not directly accepted by many medical service provider .
Here are some main reason insurance plans from India may not be best in USA:

• Because insurance provider and medical service provider are in two different countries, geting claim processed and reimbursed is difficult.
• Medical service providers in USA do not directly accept insurance from other countries because these are not provided by US insurance companies.
• Mostly you have to pay full claim from your pocket and then submit claim , which may be denied later.
• If medical claim is higher,for example $25,000 then in India its generally big hassel , you may have to fight with these indian insurance companies to get claim reimbursed
• These insurance companies do not have licenced agents in USA to help and assist you when you need them most.
• Mostly these plans provide limited coverage.