"In general, an alien in J-1 status (hereafter referred to as a “J-1 alien”) will be treated as a U.S. resident for federal income tax purposes if he or she meets the Substantial Presence Test.
Resident aliens are taxed in the same manner as U.S. citizens on their worldwide income, . . ."
https://dpss.lacounty.gov/en/health/children.html <- - - 참조해보시고 . . .
해당 지역 메디칼 오피스 직원과 담당 CPA/EA 와 상담이 필요로 보이네요.