Documents for B2 visa extension

[ejoshi]

Hi,

We are planning to request for an extension of B2 visa for my in-laws. We have medical reasons for doing so. May be I did not read it well, but websites explaining the procedure for the application do not say anything about if I am suppose to provide any supporting documents explaining the medical condition like medical bills or letter from a Doctors , etc.
Any light on this matter would be really appreciated and helpful.

Thanks.

[immihelp]

Read https://www.immihelp.com/visitors-visa-extension/