The leading MotoGP teams will test at Austin from March 12-14.
Its inaugural MotoGP race then takes place as round two of the 2013 championship on April 19-21.
The FIM's new grand prix safety officer Franco Uncini carried out the inspection on Tuesday.
He recommended some modifications to barrier openings, additional air fences and the removal of some kerbs in order to prepare the track for MotoGP.
"I like Circuit of the Americas and the facilities are really impressive: it's picturesque, modern, technical, difficult, challenging and interesting," said Uncini.
"We should be seeing some good races in April because the corners allow for no respite for the riders and should deliver plenty of overtaking.
"The tour we've done this week was to polish over some safety details, as the homologation of the circuit had already been completed.
"We are confident the event will run smoothly because we are working with highly professional people who enjoyed a great debut last season with Formula 1."