What about a US passport?
The United States is on the NIA’s 240-hour transit list, but not on the unilateral 30-day list linked here. A US traveller must still meet the transit-route and other entry conditions, or arrange an appropriate visa. [1][2]
Can I go Hong Kong → Shenzhen → Hong Kong?
That route returns to the same region; it does not match the third-country-or-region pattern required for 240-hour transit. Check whether your passport qualifies under a separate visa-free arrangement or whether you need a visa. [1]
When does the permitted stay start?
NIA guidance counts 240-hour transit from midnight after the entry date. The short-visit FAQ similarly starts its 30 calendar days on the following day. Follow the deadline recorded by immigration for your own entry. [3][5]
Does In China Health arrange visas?
We coordinate hospital visits, bilingual accompaniment and practical local arrangements. We do not issue visas or decide admission. Confirm your entry arrangements with the relevant authorities; we can then coordinate around your confirmed dates.